Assertion (A): Liquid ammonia is used as a refrigerant in ice plants.

Reason (R): CFC, the main refrigerant, causes global warming.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

Name:

(a) the gas which is prepared by Haber's process.

(b) two gases which give dense white fumes with ammonia.

(c) one salt of ammonia in each case which is used in:
    (i) dry cell (ii) explosives (iii) medicine

(d) an acidic gas which reacts with a basic gas liberating a neutral gas,

(e) a metallic chloride soluble in ammonium hydroxide,

(f) the gas obtained when ammonia burns in an atmosphere of oxygen without any catalyst,

(g) a nitride of a divalent metal which reacts with warm water liberating ammonia,

(h) an amphoteric oxide reduced by the basic gas,

(i) a white salt produced by an acidic gas and a basic gas,

(j) The gas that burns in oxygen with a green flame.

(k) The gas produced when excess ammonia reacts with chlorine.

(l) The white crystalline solid that is soluble in water. It liberates a pungent smelling gas when heated with sodium hydroxide solution.

(m) An alkaline gas which produces dense white fumes when reacted with HCl gas.

Complete the blanks (i) to (v) in the passage given, using the following words. [Ammonium, reddish brown, hydroxyl, nitrogen dioxide, ammonia, dirty green, alkaline, acidic].

In the presence of a catalyst, nitrogen and hydrogen combine to give (i) ………….. gas. When the same gas is passed through water, it forms a soln. which will be (ii)………….. in nature, and will contain the ions (iii) ………….. and (iv) …………… . A (v) ………….. coloured ppt. of iron [II] hydroxide is formed when the above solution is added to iron [II] sulphate solution.

Name the gas evolved when the following mixtures are heated :

(i) Calcium hydroxide and Ammonium chloride.

(ii) Sodium nitrite and Ammonium chloride.