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  ICSE Class X Prelims 2023 : Chemistry (Hiranandani Foundation School (HFS), Powai, Mumbai)
  	H2S2O7 + H2O -----> H2SO4 secret_2133

  + 1 more by secret_2133  

  ICSE Class X Prelims 2023 : Chemistry (Hiranandani Foundation School (HFS), Powai, Mumbai)
  	SO3 + H2SO4 ---> H2S2O7 secret_2133

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	K<Na<Si<S<Cl thereal

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	NH3 roshanaj

  + 125 more by roshanaj  

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	NaCl in the solid state is held together by the strong electrostatic forces of attraction. When it is in the fused state, the electrostatic forces are broken and thus they can conduct electricity/ roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	Alkali metals are highly electropositive. They donate electrons and become cations and are thus good reducing agents. roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	Their atoms are held together by weak Van Der Waals' forces of attraction and are thus loosely packed and exist as gases liquids or soft solids roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	Carbonate roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	Chloride roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	2NH3 + 3PbO --> 3Pb + 3H2O + N2 roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	Finely dvided iron roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	N2 + 3H2 ---> (reversible) 2NH3 + heat conditions: Catalyst: Finely divided iron Promoter: Molybdenum Pressure: 200-900 atm Temperature: 450-500 * C roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	nitrogen : hydrogen :: 1 : 3 roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	Haber's Process roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	Acid roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	Empirical Formula roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	HCl roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	Electronegativity roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	Nickel roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	Reddish brown bromine vapours are given out roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	PbCl2, a white residue is given out. PbCl2 is soluble in hot water, so it dissolves. roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	In the absence of a catalyst, ammonia burns in air to give netural gas nitrogen and water and it burns with a greenish yellow flame roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	Concentrated sulphuric acid is a dehydrating agent.  Black spongy mass is evolved along with the evolution of steam. roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	in drops, pale blue ppt is formed, in excess, it is soluble, inky deep blue solution is formed roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	a. statues medals roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	d. decorative articles roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	c. aircraft body roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	b. surgical instruments roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	e. electrical fuse roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	B. Nitric oxide roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	B. Quick Lime roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	D roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	D. H2CO2 roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	B. Nitrate  roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	D. Carbon tetrachloride roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	B. Ammonium chloride Any ammonium compound has all three bonds present in it roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	C. Bauxite roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	C. V2O5 roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	C. alkyne roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	B. mainly ions roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	C. HCl is highly soluble in water roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Baldwin Girls High School, Bangalore)
  	Argon is the noble gas in the third period, noble gases have 0 electron affinity roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	Copper, Zinc and Tin roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	Lead and TIn roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	Catenation is a property of elements by which they can form long chains with themselves and form different compounds. e.g., Carbon exhibits catenation and forms many organic compounds roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	Isomerism is the property of compounds by which they have the same molecular structure but different structural formula. roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	SO3 is the acid anhydride of H2SO4 but is not absorbe3d directly in water to make H2SO4 as the reaction is extremely exothermic and creates and dense fumes of the acid which are hard to condense. roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	It is cheaper and less easily poisoned roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	Fe(OH)3 roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	Q roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	Lower the pH, higher the acidity R is a strong acid roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	The basic solution: P roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	Ammonium Chloride and Nitrogen gas roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	Ammonia is highly soluble in water (1 vol of water absorbe 702 vols of ammonia) and is thus not collected over water. roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	Group 3A / group 13 roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	Y is the most metallic element roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	Y < Z < X roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	An Acid salt is a salt formed by the partial replacement of the replaceable hydrogen ions of an acid molecule by a basic radical. e.g., NaHCO3. NaHSO4 roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	propyne roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	phenolphtalein roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	anode electrode (made of a block of silver) roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	Role of cryolite in Hall Heroult's Process: decreases the temperature of fusion of the electrolyte from 2050*C to 950*C enhances the mobility of the electrolyte enhances the conductivity of the mixture roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	The oxygen evolved at the anode reacts with the graphite and gives out CO and CO2. This burns away at the anode and it is consumed and needs to be replaced periodically. roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	2Al3+ + 6e- --> 2Al roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	Ammonium nitrate is explosive and the NO2 produced on its decomposition interferes with the reaction. roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	addition roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	unsaturated roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	homologous roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	The solution of the electrolyte retains its blue colour roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	Reddish brown gases bromine is evolved at the anode roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	The brown colour of bromine solution is discharged roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	I > Br > Cl > F roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	Na < K < Si < S < Cl roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	Weak alkali used: NH4OH Zinc nitrate forms a gelatinous white precipitate which is soluble in excess to give a colourless solution. Ferric Chloride forms with NH4OH forms a reddish brown precipitate which is insoluble in excess. roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	Adding lead nitrate solution to both dil. HCl and dil. H2SO4 results in the formation of PbCl2 and PbSO4. PbCl2 is soluble in hot water, whereas PbSO4 is insoluble in both hot and cold water.  roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	Nitrate Ion roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	Sulphide roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	Chloride Ion Cl1- roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	1-bromo 5-chloro pemt-3-yne roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	3-methyl butan-2-ol roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	Alkanes roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	Oxygen Gas roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	Brass roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	Ores roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	Nitric Acid roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	Potassium Hydroxide (a strong electrolyte) roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	Ostwald's Process roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	C3H4 (it is an alkyne) roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	Haematite Bauxite is an ore or aluminium roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	Greenish yellow gas (HCl) roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	2. Covalent bond roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	5. Decreases roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	1. Increases roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	4. Covalent and Coordinate roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	3. Ionic Bond roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	If the reactants are heated above 200*C, then K2SO4 or Na2SO4 Will be formed. Those form hard crusts and stick to the appartus and are hard to remove. roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	In the lab, nitric acid that is prepared is yellow due to the decomposition of the acid. Reddish Brown NO2 gas dissolves and gives the acid a yellowish tinge. roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	4HNO3 --> 4NO2 + 2H2O + O2 roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	A: Potassium Nitrate (Bengal Salt Petre or Nitre) or Sodium Nitrate (Chile Salt Petre) B: conc. H2SO4 roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	(B) roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	(D) roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	(A) Increases roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	(A) 3 pairs roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	(B) Pt roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	(C) Epsomite roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	(D) Pb(OH)2 roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	(B) CaO It is also basic so it does not react with NH3 roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	(A) Nitrate Ion roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	(C) 10 covalent bonds roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	(D) Copper Nitrate The black residue is CuO roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	(D) Oxidising Agent roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	B Nitriv Oxide roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	B roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Mercy Memorial School (MMS), Kanpur)
  	C Alkyne roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Hiranandani Foundation School (HFS), Powai, Mumbai)
  	Pb2+ + 2e1- --> Pb (silvery grey lead metal deposited at cathode) roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Hiranandani Foundation School (HFS), Powai, Mumbai)
  	Al2O3 --> 2Al3+ + 3O2- roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Hiranandani Foundation School (HFS), Powai, Mumbai)
  	Platinum electrodes are inert roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Hiranandani Foundation School (HFS), Powai, Mumbai)
  	OH1- - 1e-1 --> OH x 2 2OH --> H2O + O2 4OH --> 2H2O + O2 Product at anode: Oxygen gas roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Hiranandani Foundation School (HFS), Powai, Mumbai)
  	Element: aluminium Atomic number: 13 Valency: 3+ roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Hiranandani Foundation School (HFS), Powai, Mumbai)
  	X and Y in the same period have the same number of shells. roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Hiranandani Foundation School (HFS), Powai, Mumbai)
  	Common property of halogens: highly reactive electronegative divalent monovalent  roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Hiranandani Foundation School (HFS), Powai, Mumbai)
  	X: strong acid roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Hiranandani Foundation School (HFS), Powai, Mumbai)
  	Y: weak acid roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Hiranandani Foundation School (HFS), Powai, Mumbai)
  	X: strong acid roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Hiranandani Foundation School (HFS), Powai, Mumbai)
  	Ethane: on adding bromine solution, it remains brown Ethene: on adding bromine solution, it's brown colour is discharged roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Hiranandani Foundation School (HFS), Powai, Mumbai)
  	SO2 turn acidified KMnO4 solution from pink to clear colourless and it turns acidified K2Cr2O7 from orange to clear green H2S turns KMnO4 solution from pink to colourless and it turns acidified K2Cr2O7 from orange to green. It isn't clear due to the yellow sulphur particles present in solution. Also, H2S turns lead acetate paper blue black / silvery black, while SO2 has no effect on it. roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Hiranandani Foundation School (HFS), Powai, Mumbai)
  	When we add BaCl2 to Sodium nitrate and Sodium sulphate, Ba(NO3)2 and BaSO4 respectively are formed. Ba(NO3)2 is soluble in dil. HCl, but BaSO4 is insoluble in dil. HCl, thus distinguishing sodium nitrate and sodium sulphate solution, roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Hiranandani Foundation School (HFS), Powai, Mumbai)
  	If Lead Hydroxide Pb(OH)2 solution is added to both in drops, then both solutiosn will form a chalky white precipitate. On excess addition of Pb(OH)2 in Sodium hydroxide solution, it is soluble in excess and forms a colourless solution of sodium plumbite. Pb(OH)2 is insolube is excess of ammonium hydroxide. roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Hiranandani Foundation School (HFS), Powai, Mumbai)
  	CH3COONa + NaOH --> (in the presence of CaO) CH4 + Na2CO3 roshanaj

  ICSE Class X Prelims 2023 : Chemistry (Cathedral & John Connon School, Mumbai)
  	c bananachips

  + 14 more by bananachips  

  ICSE Class X Prelims 2023 : Chemistry (Cathedral & John Connon School, Mumbai)
  	b bananachips

  ICSE Class X Prelims 2023 : Chemistry (Cathedral & John Connon School, Mumbai)
  	d bananachips

  ICSE Class X Prelims 2023 : Chemistry (Cathedral & John Connon School, Mumbai)
  	b bananachips

  ICSE Class X Prelims 2023 : Chemistry (Cathedral & John Connon School, Mumbai)
  	a bananachips

  ICSE Class X Prelims 2023 : Chemistry (Cathedral & John Connon School, Mumbai)
  	d bananachips

  ICSE Class X Prelims 2023 : Chemistry (Cathedral & John Connon School, Mumbai)
  	c bananachips

  ICSE Class X Prelims 2023 : Chemistry (Cathedral & John Connon School, Mumbai)
  	c bananachips

  ICSE Class X Prelims 2023 : Chemistry (Cathedral & John Connon School, Mumbai)
  	d bananachips

  ICSE Class X Prelims 2023 : Chemistry (Cathedral & John Connon School, Mumbai)
  	a bananachips

  ICSE Class X Prelims 2023 : Chemistry (Cathedral & John Connon School, Mumbai)
  	c bananachips

  ICSE Class X Prelims 2023 : Chemistry (Cathedral & John Connon School, Mumbai)
  	d bananachips

  ICSE Class X Prelims 2023 : Chemistry (Cathedral & John Connon School, Mumbai)
  	a bananachips

  ICSE Class X Prelims 2023 : Chemistry (Cathedral & John Connon School, Mumbai)
  	b bananachips

  ICSE Class X Prelims 2023 : Chemistry (Cathedral & John Connon School, Mumbai)
  	b bananachips

  ICSE Class X Prelims 2023 : Chemistry (Loyola School, Bhubaneswar)
  	Ethane ayc405

  + 34 more by ayc405  

  ICSE Class X Prelims 2023 : Chemistry (Hiranandani Foundation School (HFS), Powai, Mumbai)
  	Z: Strong alkali ayc405

  ICSE Class X Prelims 2023 : Chemistry (Loyola School, Bhubaneswar)
  	Addition ayc405

  ICSE Class X Prelims 2023 : Chemistry (Loyola School, Bhubaneswar)
  	Ethene ayc405

  ICSE Class X Prelims 2023 : Chemistry (Loyola School, Bhubaneswar)
  	A: C2H5Br + KOH (alcoholic) --> C2H4 + KBr + H2O B: C2H4 + Br2 --(CCl4)--> C2H4Br2 ayc405

  ICSE Class X Prelims 2023 : Chemistry (Loyola School, Bhubaneswar)
  	A: BaSO4 + HCl---> BaCl2 +H2O + SO2 ayc405

  ICSE Class X Prelims 2023 : Chemistry (Loyola School, Bhubaneswar)
  	N2 +3H2 <--> 2NH3 Temperature: 450-500 degree celsius Pressure: 200-900 atm ayc405

  ICSE Class X Prelims 2023 : Chemistry (Loyola School, Bhubaneswar)
  	Catalyst: Finely divided Fe Promoter: Molybdenum ayc405

  ICSE Class X Prelims 2023 : Chemistry (Loyola School, Bhubaneswar)
  	Haber's process ayc405

  ICSE Class X Prelims 2023 : Chemistry (Loyola School, Bhubaneswar)
  	Anode reaction in electrorefining of copper: Cu- 2e --> Cu2+ ayc405

  ICSE Class X Prelims 2023 : Chemistry (Loyola School, Bhubaneswar)
  	Electrorefining of copper Electroplating  ayc405

  ICSE Class X Prelims 2023 : Chemistry (Loyola School, Bhubaneswar)
  	1.  2- methyl propene 2. 1,1,2,2- tetrabromo ethane ayc405

  ICSE Class X Prelims 2023 : Chemistry (Loyola School, Bhubaneswar)
  	Non volatile acid ayc405

  ICSE Class X Prelims 2023 : Chemistry (Loyola School, Bhubaneswar)
  	Dehydrating agent ayc405

  ICSE Class X Prelims 2023 : Chemistry (Loyola School, Bhubaneswar)
  	Oxidizing agent ayc405

  ICSE Class X Prelims 2023 : Chemistry (Loyola School, Bhubaneswar)
  	Ammonia is basic in nature Hydrogen chloride is acidic in nature ayc405

  ICSE Class X Prelims 2023 : Chemistry (Loyola School, Bhubaneswar)
  	Botth gases are highly soluble in water ayc405

  ICSE Class X Prelims 2023 : Chemistry (Loyola School, Bhubaneswar)
  	Ammonia and hydrogen chloride are highly soluble in water, but hydrogen and oxygen are not. ayc405

  ICSE Class X Prelims 2023 : Chemistry (Loyola School, Bhubaneswar)
  	Cryolite enhances the mobility of the mixture and lowers the fusion point from 2050 to 950 degree celsius. ayc405

  ICSE Class X Prelims 2023 : Chemistry (Loyola School, Bhubaneswar)
  	Concentrated sodium hydroxide. This is used because aluminium is amphoteric and reacts with sodium hydroxide, but its impurities like Fe2O3 and SiO2 are not amphoteric and hence do not react. Addition of sodium hydroxide seperates out the impurities. ayc405

  ICSE Class X Prelims 2023 : Chemistry (Loyola School, Bhubaneswar)
  	Apparatus is all glass this is because nitric acid vapourrs are corrosive and corrode materials like rubber and cork. however, they cannot corrode glass. ayc405

  ICSE Class X Prelims 2023 : Chemistry (Loyola School, Bhubaneswar)
  	KNO3 + H2SO4 (conc.) ---(<200 degree celsius)---> KHSO4 +HNO3 ayc405

  ICSE Class X Prelims 2023 : Chemistry (Loyola School, Bhubaneswar)
  	Quicklime/ Calcium oxide ayc405

  ICSE Class X Prelims 2023 : Chemistry (Loyola School, Bhubaneswar)
  	Downward displacementt of air ayc405

  ICSE Class X Prelims 2023 : Chemistry (Loyola School, Bhubaneswar)
  	Mg3N2 + 6H2O (warm) ---> 2NH3 + 3Mg(OH)2 ayc405

  ICSE Class X Prelims 2023 : Chemistry (Loyola School, Bhubaneswar)
  	NO2 is not evolved. ayc405

  ICSE Class X Prelims 2023 : Chemistry (Loyola School, Bhubaneswar)
  	S+ 6HNO3 (conc.) ---> H2SO4 + 6NO2 + 2H2O ayc405

  ICSE Class X Prelims 2023 : Chemistry (Loyola School, Bhubaneswar)
  	Precipitate of copper hydroxide is pale blue in colour not white ayc405

  ICSE Class X Prelims 2023 : Chemistry (Hiranandani Foundation School (HFS), Powai, Mumbai)
  	Cu -2e ---> Cu2+ ayc405

  ICSE Class X Prelims 2023 : Chemistry (Hiranandani Foundation School (HFS), Powai, Mumbai)
  	AlPO4 ayc405

  ICSE Class X Prelims 2023 : Chemistry (Hiranandani Foundation School (HFS), Powai, Mumbai)
  	Mg +H2SO (dil.) ---> MgSO4 + H2 Colourless odourless evolved that burns with pale blue flame and extinguishes a burning splinter with a pop sound ayc405

  ICSE Class X Prelims 2023 : Chemistry (Hiranandani Foundation School (HFS), Powai, Mumbai)
  	Ammonia (in the abscence of a catalyst) burrns in air with a greenish yellow flames. Porducts are nitrogen and water vapour. ayc405

  ICSE Class X Prelims 2023 : Chemistry (Hiranandani Foundation School (HFS), Powai, Mumbai)
  	Residue left (ZnO) is yellow when hot and white when cold. Gas evolved (NO2) is reddish brown ayc405

  ICSE Class X Prelims 2023 : Chemistry (Hiranandani Foundation School (HFS), Powai, Mumbai)
  	The reddish brown colour of the bromine vapours is discharged and the solution turns colourless ayc405

  ICSE Class X Prelims 2023 : Chemistry (Hiranandani Foundation School (HFS), Powai, Mumbai)
  	Weak electrolyte ayc405

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