ICSE CHEMISTRY - PRACTICE PAPER 14

ICSE CHEMISTRY - PRACTICE PAPER 14

A) Calculate:                                                                                                        5M

i) The mass of 1 mole of Ammonia gas.

ii) The mass of 0.25 moles of Oxygen gas.

iii) The number of moles present in 1000g. of CaCO₃.

iv) The number of moles present in 3.6g. of Water.

v) The volume occupied by 4.4g of Carbon dioxide

B) Name the following.                           5M

i) The non metal which is used in alloying.

ii) The rocky impurities associated with an ore.

iii) A weak monobasic acid.

iv) A strong acid which is drying agent as well as dehydrating agent.

v) An alloy of Copper and Zinc only.

C) Give reason why:                                                                                                        5M

i)        Alkali metals are highly electropositive.

ii)      Zinc container is used as cathode in dry cells.

iii)    Aluminium is used in packaging.

iv)    In metallurgy ores are converted to metal oxides.

v)      Ammonium nitrate is not preferred in the laboratory preparation of Ammonia gas.

D) Name the following acids.                                                                                            5M

      i) The acid which is prepared by the catalytic oxidation of Ammonia gas.

      ii) The acid which gives a white precipitate with Lead nitrate solution.

      iii) The acid which is formed when a non volatile acid is heated with a nitrate salt.

      iv) The acid which is formed Pyrosulphuric acid is dissolved in water.

            v) The acid which gives charcoal(Carbon) on treating with Sugar crystals.