Starting from hydrogen gas how would you obtain

(a) A neutral liquid

(b) A basic gas

(c) A metal by reduction of its heated oxide.

[the metal formed is above iron in the activity series]

Using a burning candle and a jar of hydrogen - how would you prove experimentally that

(a) Hydrogen is a combustible gas

(b) Hydrogen does not support combustion.

With reference to the uses of hydrogen, give reasons for the following —

(a) Hydrogen is not used in air balloons.

(b) A mixture of hydrogen & oxygen on burning, find application in welding & cutting metals

(c) Reaction of hydrogen with nitrogen under specific conditions finds industrial utility.

Give a test to differentiate between jar containing pure hydrogen & the other hydrogen-air mixture.