Question

a) From the following organic compounds given below, choose one compound in each case which relates to the

description [i] to [iii]: [3]

[Ethyne, ethanol, acetic acid, ethene, methane]

i) An unsaturated hydrocarbon used for welding purposes.

ii) An organic compound whose functional group is “– COOH ’’.

iii) A hydrocarbon which on catalytic hydrogenation gives a saturated hydrocarbon.

b) Give a balanced chemical equation for each of the following: [2]

i) Action of alcoholic, hot KOH on bromoethane.

ii) Polymerization reaction of ethene.

c) Write the I.U.P.A.C names of the following compounds - [2x2=4]

i) ii)

d) CH3 – CH3 ? [1]

Question 5 :

a) A compound has the following percentage composition by mass: Carbon 14.4%, Hydrogen1.2% and Chlorine

84.5%. Determine the empirical formula of this compound. Work correct to one decimal place.

The relative molecular mass of this compound is 168, so what is its molecular formula?

(H = 1, C = 12, Cl =35.5) [3+1]

b) i) Why do covalent compounds exist as gases, liquids or soft solids?

ii) Which electrode: anode or cathode is the oxidising electrode? Why? [3]

c) Name the kind of particles present in: [3]

i) Sodium hydroxide solution.

ii) Carbonic acid.

iii) Sugar solution.

Question 6 :

With respect to the electrolysis of lead bromide (PbBr2), answer the following questions:

a) Why is lead bromide maintained in molten state? [1]

b) Why is the electrolytic cell made of silica? [2]

c) Name the ions present in the electrolyte. [2]

d) State what you observe at the cathode and anode. [2]

e) Summarize the electrode reactions. [3]

Question 7 :

a) Write the observations and balance equations for the following reactions –

i) Sodium hydroxide is added drop wise till in excess to a solution of Zinc sulphate. [2]

ii) Ammonium hydroxide is added first in a small quantity and then in excess to a solution of Copper sulphate. [2]

b) Complete and balance the following Chemical reactions: [2x3=6]

i) Na2S2O3 + HCl _____+ ______ + _____+ ______.

ii) FeSO4 + NH4OH ______ + ________.

iii) CuCO3 + dil. HNO3 _______ +_______+ _______.

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Answer 1

Answer:

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Answer 2

Answer:

arre yaar itne Sare questions mat bheja Karo

at a time three to four questions bheja Karo

it becomes difficult