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ICSE Class X Prelims 2026 : Chemistry (Lady Ratanbai and Sir Mathuradas Vissanji Academy, Mumbai)

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. R. & S. M. VISSANJI ACADEMY Secondary Section 2025-26 First Preliminary Examination Subject: Chemistry 8td: 10 VISSAN|! ACADEMY Marks: 80 Time: 2 hours Date: 27/ 11/25 INSTRUCTIONS Answers to this Paper must be written on the paper provided separately. You will not be allowed to write during the first 15 minutes. This time is to be spent in reading the question paper. The time given at the head of this Papcr is the time allowed for writing the answers. Section Ais compulsory. Attempt any four questions from Section B. The intended marks for guestions or parts of questions are given in brackets| ] SECTION A (Attempt all questions from this Section.) Question 1 Choose the correct answers to the questions from the given options. (Do not copy the question, write the correct answers only.) (15] (i) which one anongst the following has the smallest atomic radius? (a) Ci (b) Ar (c) Al (d) Na (ii) The ratio between the volumes occupied by 22 grams of carbon dioxide and 10grams of hydrogen gas is: (a) 2.2 :1 (b) 1: 2.2 (c) 1:10 (d) 10:1 (il) Assertion (A): Sugar solution can not conduct electricity. Reason (R): Conduction of electric current is due to the presence of free ions, sugar solution contains only molecules. (a) (A) is true and (R) is false. (b) (A) is lalse and (R) is true. (c) Both (A) and (R) are true and (R) is the corret explanation of (A). (d) Both (A) and (R) are true, but (R) is not the correcct explanation of (A). (iv) Which metal doe not react with HCI to form a colourless, odourless gas which burns with a pop sound? (a) Cu (b) Mg (e) Zn () Ca below. diagram shown fining of process (v) In the of the Which of Electrore s t a t e m e n t s in the Copper correct? is following Cathode Anode .Cu504 solution Anode mud I lestrurcining ol ( pper pure Copper. (a) The anode is made of impure Copper. (b) The cathode is made of at the anode. (c) Copper is deposited anode move to the cathode and get the (d) Copper ions from deposited as pure Copper. in acidity? there the maximnum increase is change pH which For (vi) Initial pH Final pH (a) 1 3 (b) 2 6 (c) 3 1 (d) 2 ethane is falsse? (vii) Which of the following statements about (a) It is a saturated hydrocarbon. (b) It undergoes a substitution reaction. (c) It is a gas at ordinary temperatures. (d) It has a triple bond between the carbon atoms. with (viii) Element Y is in Group IIA of the Periodic Table. Y reacts element Q to form an ionic compound. Which equation shows the process that takes place when Y forms ions? (a) Y +2e-- Y2+ (c) Y + 2e-- Y2 (b) Y - 2e- y2t (d) Y - 2e--, Y? 2 (ix) The (1) structures of three hydrocarbons Are shown below: HC CH; (2) CH CH3 H3C CH CH3 (3) HCEC -CH CH Which are the isomers of Pentyne from the given structures ? (a) land 2 only (b) 2 and 3 only (c) 1and 3 only (d) all of thcse pure aluminium (X) Assertion (A): Hall Heroult's process is used to get from its oxide. form. is not found in aluminiun oxide Keason (R): Aluminium generally (a) Both A and R are correct. of A. (b) A is correct, but R is not atrue explanation is correct, and R is a true explanation of A. (c) A (d) Both A and R are incorrect. the better growth of crops, (xi)The pH of the soil is tested, and for Which ion in the fertilizer will slightly alkaline soil is required. increase the alkalinity of the soil? (a) Hydronium ion (b) Hydroxyl ion (c) Hydrogen ion (d) Both hydroxyl and hydrogen table given below, (xii) With reference to the portion of the periodic size: identify the element having the largest atomic Group IA Numbers IIA 2 A Mg B C (b) L 13 14 VA VIA VIIA VIIIA 15 16 17 18 Ne D Li (a) Li IIIA IVA E H Si K L G F (c) B 3 (d) Ne reactions are shown below in the diagram: 2. (xiii)Four 1. c a l c i u m c a r b o n a t e dilutc hydrochloric acid zinc dilute magnesium carbonate Sulphuric ethanol acid 4. 3. Out of these four, which reactions produce water? (d) 2 and 3 {c) 3 and 4 (a) 1and 2 (b) 1and 3 (xiv) During the extraction of aluminium by Hall Heroult'sprocess, the carbon rods are replaced continuously. This is because: (a) It minimises heat loss by radiation. (b) It enhances the mobility of ions. (c) The carbon anode is consumed. (d) It lowers the fusion point. (xv)Given below are four covalent compounds. (A)H,0 (B) CCl, (C) Cl, (D) NH, Which of the following represents the correct order when they are arranged in their increasing number of covalent bonds? (b) A<C<D <B (a) B < D <A< C (d) C< A<D <B (c) C < D <A < B Question2 (i) Electroplating steel objects with silver involves a three-step process. step 1A coating of copper is applied to the object. step 2 A coating of nickel is applied to the object. [5) step 3 The coating of silver is applied to the object. 4 (a) A diagram of the apparatus used for step l is shown. copper(anode) stecl object(cathode) aqucous copper(1) sulphate electrolybe 1. The chemical process taking place on the surface of the object 1s Cuzt (aq) + 2eCu(s) What 1s the observation seen on the surface of the object? 2. Bxplain why the concentration of copper ions in the electrolyte remains constant throughout step1. (b) Give two changes which would be needed in order to coat nickel onto the object in step 2. (c) Write down the reaction taking place at the positive electrode during step 3. (i) Identify the following: [5] (a) A compound formned because of the formation of bond between two non metallic atoms by mutual sharing of electrons. (b) A salt formed by the partial neutralisation of an acid by abase. (c) A reaction in which the hydrogen of an alkane is replaced by a halogen. (d) The tendency of an atom to attract electrons to itself when combined in a Compound. (e) The compounds of various metals found in nature associated with their earthly impurities. (i ) Complete the following by choosing the correct answers from the bracket: (5] (a) When dilute hydrochloric acid reacts with magnesium carbonate, the gas evolved is (hydrogen / carbon dioxide), which can be tested using lime water. (b) Asolution of Ferrous (1) sulphate in ammonium hydroxide solution forms a (reddish brown /dirty green) precipitate. (c) In mnethane, each hydrogen atom share(s) (one /two) electron(s) with the central carbon atom to complete its valence shell. 5 d) is Iikely to be ionisation energv then it Element Z has a low (metallic /non metallic). presence of excess air concentrated ore in the the heating (C) The process of metal is before it is reduced to the temperature t0a high (calcination /roasting ) [5] (iv) Match Column A with Column B. Column B Column A (a) Neon (i (b) Methane (c) Ammonia gas in water (d) An ion with a lone pair of Hydronium ion ( ) (ii) | Magnesium hydroxide (iv) Non-polar covalent electrons (e) A weak electrolyte Ammonium ion Compound (v) Zero electron affinity (v) (a) Give the IUPAC name of the following organic compounds: |2] 1. 2 HI I-U I-UyII H H- -c- H HHH -H -H H |H-(-(-(-C H- C-H (b) Draw the structural diagramn for the following compounds: [3] 1) 2-bromo-4-chloro pentane 2) propan -2-ol 3) Diethyl ether SECTION B (40 Marks) (Attempt any four questions.) Question 3 (i) Give one significant observation when: (a) Burning of ammonia in an atmosphere of excess oxygen. (b) Lead (1) nitrate is strongly heated in a test tube. (2] (i) Give scientific (a) When ammonia reasons: tube a reddish gas is passed ove black Copper brown substance is (b) Dry ammonia is collected by [2) 0xide in a combustion left behind. downward displacerIent of air, not water (iii) Sita's father bought a basket of ripe 1Ounaa small sachet containing a mangoes. While opening it she white Witn the mangoes. She was told that it crystalline powder along is a chemical that releases a gas when it comes in contact with moisture that induces ripening of fruits. [3] (a) Name the chemical powder in the sachet. (b) Name the gas. (C) Give a balanced chemical eguation for the reaction that results in the evolution of this gas. (iv) Write balanced chemical eguations for the following reactions: (3] (a) Action of heat on a mixture of Manganese dioxide and conc.HCI (b) Excess of chlorine gas reacts with ammonia. (c) Reduction of Zinc oxide by coke. Question 4 (i) Namne the mnain metal present in the following alloys: (a) Stainless steel [2] (b) Solder (i ) Write balanced chemicalequations for the following: [2) (a) Laboratory preparation of ammonia from Magnesiun nitride. (b) Bromine gas is passed over ethyne in the presence of carbon tetrachloride. (i i) Dhyanvi was given a salt * for analysis which was light green in colour. On strong heating it produced a black residue, a colourless gas which has no effect on acidified KMnO4 paper. Later the salt X is heated with dil. HClacid gives the same colourless gas and a coloured solution,that solution when filtered and tested with ammonium hydroxide produced a pale blue [3] precipitate. (a) Name the colourless gas evolved when heated the salt strongly. (b) Which cation was present in the sample given to Dhyanv ? (c) Identify the salt given to Dhyanvi for analysis. (iv) In a round bottom flask, a mixture of ethanol, acetic acid and concentrated sulphuric acid was heated: 7 [3] 0ccuring in the above set up. reactiOn (a) Nane the type of in this sulphurie acid rcaction. (b) What is the role of conc during the place takes (c) State one observation that reaction? Question 5 balanced (i) Identify the reactant X and write the following: Hydrochloric acid reacts with and hydrogen sulphide gas. Compound equation for the Iron (|I) X to give a salt [2] chloride, that will contain the Same (11) What will be the nass of Sulphur dioxide [2] number of molecules as present in 6.4 g of oxygen gasr [At. Wt: Q=16, S-32] (ii) The empirical formula of a hydrocarbon is C,H,.The hydrocarbon has a relative molecular mass of 54. (At wt: H = 1, C= 12) (3] (a) What is themolecular formula of the hydrocarbon? (b) Draw the structural formula of the hydrocarbon. (c) Give the general formula of the hydrocarbon. (iv) Give balanced equations for the following: [3] (a) Laboratory preparation of ethene from ethyl bromide. (b) Conversion of ethanol to sodium ethoxide. (c) Complete oxidation of methane. Question 6 (i) Study the information given in the table below and answer the questions that follow. (Note- the letters do not represent the actual symbols of the elements) (2) Element Electrouc contiguration lonisation energy kimo! 22 232 (a) Explain why element X has highest ionisation energy. (b) Towhich period does Z belong? Justify. )You are box: provided with the list of chemicals mentioned below in the (2] Sodium hydroxide acid, copper, dilutesolution, copper carbonate, zinc, sulphuric acid hydrochloric Using suitable chemicals from equation for the preparation of the list given. write balanced chemical the salts mentioned (a) Copper (1I) below: sulphate (b) Sodium zincate (1ii) Shivali found that 30g of a gas occupied 1000 c.c at STP. [3] (a) What will the gram molecular weight of this gas be? (b) Calculate the vapour density of the gas. (C) How many molecules of this gas will be present in 44.8 1ol it? (iv) Identify the reactants P., O and R in the following reactions: [3] (a) Zinc blende +Q->zinc oxide + Sulphur dioxide (b) Copper oxide + P-Copper t carbon monoxide. (c) Aluminium hydroxide +R- Pottasiun aluminate +water. Potascium Question 7 [2] (i) Give reasons for the following: (a) Ammonia in pure liquid state does not conduct electricity but conducts electricity when dissolved in water. (b) Sodium argentocyanide is preferred to silver nitrate for silver electroplating. (i ) The following questions relate to the extraction of Aluminium by electrolysis. [2] (a) Nanethe compounds added in the electrolytic mixture of alumina. (b) Give a balanced equation for the reaction that takes place at the anode. (iii) Identify the gas given out in each of the following: [3] (a) Thermal decomposition of Mercury oxide. (b) Catalytic oxidation of ammonia. (c) Combustion of ethanol. (iv) Anshul has solutions L, Mand Nthat have pH 3, 7 and 13 respectively. Which solution/s: (a) will liberate hydrogen gas when heated with aluminium metal? (b) will turn pink with methyl orange ? (c) will not show any colour change with phenolphthalein ? [3] Question 8 (1] sodium adding Zinc nitrate and lead nitrate can be distinguished by (i) State giving reasons if: hydroxide solution to the sall solution. (ii) Draw the electron dot diagram of Hydronium ilon. (2] |Atomic No.: 0 = 8, H= 1] (lii) X, Y and Z are three elements with atomic numbers 12, 16 and 9 respectively. Answer the following questions using only the alphabets given. Do not identify the elements. (3] Which element: (a) can combine with hydrogen toform agas which gives rotten egg smell ? (b) is the most clectronegative element ? (c) can form an ionic compound with chlorine? (iv) Write balanced chemical equation for the following conversions (4) (A to D): 8 Sodium Hydrogen Chiorde ChHonde Iron(ll) Chlondel CAmmonium Chloride Lead ChioDde 10

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