Fill in the blanks by choosing the correct answer from the brackets:

(a) During electrolysis, the compound …………… in its molten state liberates reddish brown fumes at the anode. [NaCl/PbBr₂]

(b) The ion which could be discharged most readily during electrolysis is …………… [Fe²⁺/Cu²⁺]

Arrange the following as per the instruction given in the brackets:

(a) Al, K, Mg, Ca (decreasing order of its reactivity)

(b) N, Be, O, C (increasing order of non-metallic character)

(c) P, Si, F, Be (decreasing order of valence electrons)

State a relevant reason for the following:

(a) Hydrogen chloride gas cannot be dried over quick lime.

(b) Ammonia gas is not collected over water.

Identify the alloy in each case from the given composition:

(a) aluminium, magnesium, manganese, copper

(b) iron, nickel, chromium, carbon