Which of the following tests will completely identify anyone of surphur (VI) oxide, hydrogen, carbon (IV) oxide and nitrogen (II) oxide?

A. Pass each gas into water and test with blue litmus paper

B. Pass each gas into lime water

C. Expose each gas to atmospheric air

D. Pass each gas to concentrated tetraoxosulphate (IV) acid

In the Haber process for the manufacture of ammonia, the catalyst commonly used is finely divided ?

A. vanadium

B. platinum

C. iron

D. copper

A metallic oxide which reacts with both HCl and NaOH to give salt and water only can be classified as?

A. an acidic oxide

B. a basic oxide

C. a neutral oxide

D. an amphoteric oxide

Which of the following metals will liberate hydrogen from steam or dilute acid?

A. Copper

B. Iron

C. Lead

D. Mercury

Coal fire should not be used in poorly ventilated rooms because ?

A. of the accumulation of CO₂ which causes dep sleep

B. it is usually too hot

C. of the acumulation of CO which causes suffocation

D. it removes most most of the gases in the rooms

The major component of the slag from the production of iron is?

A. an alloy of calcium and iron

B. coke

C. impure iron

D. calcium trioxosilicate (IV)

Sodium hydrogen should be stored in properly closed containers because it?

A. readily asborbs water vapour to air

B. is easily oxidize by atmospheric oxygen

C. turns golden yellow when exposed to light

D. melts at a low temperature

To make coloured glasses, small quantities of oxides of metals which form coloured silicates are often added to the reaction mixture consisting of Na₂CO₃ and SiO₂. Such a metals is a?.

A. pottasium

B. barium

C. zinc

D. copper

Which of the following compounds gives a yellow residue when heated and also reacts with aqueous sodium hydroxide to give a white gelatinous precipitate soluble in excess sodium hydroxide solution?

A. (NH₄)CO₃

B. ZnCO₃

C. Al₂(SO₄)₃

D. PbCO3

A cycloalkane with the molecular formula C₅H₁₀ has ?

A. one isomer

B. two isomers

C. three isomers

D. four isomers