ICSE CHEMISTRY - PRACTICE PAPER 13

ICSE CHEMISTRY - PRACTICE PAPER 13

a) Choose the correct answers from the words given below                                                      5M

(calcination, NaOH, Magnetic separation, Al(OH)₃, Zinc, Roasting, Nitrogen dioxide)

i)        The suitable method for concentration of Iron ore.

ii)      Conversion of sulphides into metal oxides in presence of air.

iii)    The chemical used to remove impurities from Bauxite ore in Baeyer’s process.

iv)    Distillation refining is suitable for the refining of this metal.

v)      The gas produced when Conc.Nitric acid reacts with Copper metal.

b)   Match the following.                Example-   vi-A                                                                   5M

Part-A

i)   A simple whole number ratio

ii)  The metal used in thermite welding

iii) An insoluble salt

iv) The process of heating concentrated

ore in the absence of air.

v)  An insoluble base

vi) A strong acid

Part-B

A) Hydrochloric acid

B) AgCl

C) Empirical formula

D) Al(OH)₃

E) Aluminium

F) Roasting

G) Calcination

c) Select the correct answers from the words given below:                                                       5M

i)           The metal which is a poor conductor of electricity:

A) Copper                        B) Aluminium                C) Gold                    D) Tungsten

ii)         Which of the following acts as a strong oxidizing agent

A) Conc. HNO₃               B) dil.H₂SO₄                  C) dil.HCl                D) NaOH soln.

iii)       The acidity of Sodium hydroxide is

A) 1                                 B) 2                                C) 3                          D) 4

iv)       Which of the following is not an acid salt:

A) NaHCO₃                     B) NaHSO₄                    C) Na₂SO₄                D) NaHSO₃

v)         The composition of solder:

A) Pb+Cu                        B) Pb+Sn                       C) Pd+Sn                 D) Zn+Cu

d) Fill in the blanks:-                                                                                                                  5M

i)        ____________(sulphide/carbonate) ores are concentrated by froth flotation method.

ii)      Haematite is an ore of ____________(Aluminium/Iron).

iii)    Nitric acid on heating liberates ______________(NO₂/NO).

iv)    _____________ (Hydrochloric/Sulphuric) acid is used in pickling of metals.

v)      FeCl₃ is a ___________ (deliquescent/hygroscopic) substance.