Give a balanced equation for : Reduction of hot Copper (II) oxide to copper using ammonia gas.

State the - (i) Temperature (ii) Catalyst used in the Haber's process for manufacture of ammonia. Give the equation for the catalyzed reaction.

Fill in the blank from the choices given in bracket : Ammonia gas is collected by ………….. (upward displacement of air, downward displacement of water, downward displacement of air)

Write balanced equation for : Action of warm water on magnesium nitride.