ICSE CHEMISTRY - PRACTICE PAPER 12

ICSE CHEMISTRY - PRACTICE PAPER 12

Question 1                                                                                                                           [4+3+3]

Answer the questions a) and b) with respect to the laboratory preparation of Ammonia gas.

a) i) Name the reactants taken in the process.

   ii) Name the drying agent used

   iii) State the identification test for Ammonia gas.

   iv) Write balanced equation for the above preparation.

a)   Give reasons

i) Round bottom flask is kept in inclined position.

ii) Conc. Sulphuric acid is not used as a drying agent.

iii) Ammonium nitrate is not used in this method.

b)      i) Name the industrial process by which Ammonia is prepared from Nitrogen and

Hydrogen.

   ii) State whether the above reaction is exothermic or endothermic.

   iii) State the observation seen when gry Ammonia gas is passed over heated yellow PbO.

Question 2                                                                                                                         [3+3+2+2]

a)      i) Give balanced equation for the preparation of Nitric acid in laboratory method.

Give reasons why :

ii) Nitric acid prepared in the above process appears in yellow colour.

iii) The entire apparatus is made of glass only in this method.

b)      i) State the composition of Aqua regia.

ii) Name the basic oxide formed when Copper nitrate undergoes thermal decomposition.

iii) Write the balanced equation for the reaction between Conc.HNO₃ and Cu.

c)      State any two uses of acids.

d)     Find the Empirical formula of a compound whose composition is given below.

C-40%, H-6.7% and O-53.3%

At.wt.-H-1, C-12, O-16