ICSE CHEMISTRY - PRACTICE PAPER 6

ICSE CHEMISTRY - PRACTICE PAPER 6

Question 1                                                                                                                             5+3+2

a) Select the suitable option for following descriptions.

(Hydrogen suphide, Nitrogen dioxide, Oxygen, Potassium dichromate, Ammonia gas, Sulphur dioxide)

i) The gas which turns alkaline Pyrogallol to brown.

ii) The orange colour solution which turns to clear green on passage of Sulphur dioxide through it.

iii) A greenish yellow colour gas with pungent odour.

iv) A gas which turns Nessler’s reagent to brown.

v) Lead acetate gives Silvery black precipitate with this gas.

b)  State the observations seen when Ammonium hydroxide solution is added to the salts containing following cations:

i) Cu²⁺                    ii) Fe²⁺                         iii) Ca²⁺

c) Sate the nature of the following gases in terms of acidic/basic.

i) Ammonia                                     ii) Nitrogen dioxide

Question 2                                                                                                                           4+4+2

a)      i) State the significance of special funnel arrangement in preparation of Hydrochloric acid from Hydrogen chloride gas.

ii) Name the gas released when dil. HCl reacts with sodium sulphite solution.

iii) State the observation seen in the following reaction.

CuS + 2HCl à CuCl₂ + H₂S

iv) Mention any one industrial use of Hydrochloric acid.

b)      Write balanced equations for the following conversions:

i)        dil HCl à ZnCl₂

ii)      dil. HCl à H₂S

iii)    Pb(NO₃)₂ àPbCl₂

iv)    MnO₂ àCl₂

c)      State the observations seen when:

i) Conc. HCl is heated with Pb₃O₄

ii) dil. HCl is added to Sodium carbonate.