Trending ▼   ResFinder  

ISC Class XII Prelims 2019 : Chemistry

6 pages, 98 questions, 43 questions with responses, 43 total responses,    2    0
vksir117
  
+Fave Message
 Home > vksir117 >   F Also featured on: isc

Formatting page ...

Class: Preliminary Examination -2018 You will not be allowed to write during the first 15 minutes This time is to be spent in reading the question paper. Answer all questions are compulsory Question 1 is of 20 marks having four sub parts all of which are compulsory. Question numbers 2 to 8 carry 2 marks with two questions having internal choice. Question numbers 9 to 15 carry 3 marks with two questions having internal choice. Question numbers 16 to 18 carry5 marks each. Each question has an internal choice. Some useful constants - R=0.0821 latmK-1mol-1, 8.314 JK-1mol-1 h=6.626 x 10 -34Js Me =9.1 X 10 -31 Kg, C= 3 x 108 m/s. Atomic weight: H=1, C=12, N=14, O=16, Na=23, Mg=24, Al=27, K=39, Cr=52 P=31, S=32, Cl=35.5, Ca=40, Fe=56, Cu=64, He=4, Li=7Mn=55 Atomic number:Cr=24,Cu=29, H=1, N=7, Na=11,Al=13, He=2,Li=3 Question 1 a) Fill in the blanks by choosing the words from those given in the brackets: [4] [+ 3 ,lower,atoms, acidic, positive,reduction, +4, hydrogen , basic, 8, negative, no gas, molecules ,+6, heat, sp3, carbon dioxide, ions, oxidation, - 3] i) ii) iii) iv) The crystal of graphite is made up of _______ while that of sodium chloride is made up of _______. Lithium has the highest standard ________ potential value and fluorine has highest standard _______ potential value. Oxidation state of Phosphorous in phosphine is _______ and sulphur in pyrosulphuric acid is _____ Phenol reacts with sodium metal and liberates ______ gas and on treatment with sodium bicarbonate releases ________ . b) Select the correct alternatives from the choices given : [4] i) A solution of 0.450 g of urea (mol.wt. 60) in 22.5 g of water showed 0.1700C of elevation in boiling point. The molal elevation constant of water is a) 0.510C. b) 0.950C c) 0.250C d) 2.250C ii) Which isomer of C4H9Br will produce 2-methylpropan-2-ol by treatment with aqueous KOH? a) n-butyl bromide b) Isobutyl bromide c) Tertiary-butyl bromide d) Sec-butyl bromide iii) Which among the following gives aldol condensation reaction? a) phenol b) benzophenone 1

Formatting page ...

Top Contributors
to this ResPaper
(answers/comments)


Sharanya mistry

(26)

Indrani Adhikari

(12)

Rajashri Kadamba

(3)

Saptarshi Das

(3)

Formatting page ...

Formatting page ...

Formatting page ...

Formatting page ...

 

  Print intermediate debugging step

Show debugging info


 

 

© 2010 - 2019 ResPaper. Terms of ServiceContact Us Advertise with us

 

ICSE Q&A - Ask and Answer
vksir117 chat