The metal used in storage batteries is:

(a) Cu

(b) Sn

(c) Pb

(d) Ni

Which process is not used in purification of bauxite?

(1) Hall's method

(2) Baeyer's method

(3) Serpek's method

(4) Frankland's method

Chloride ore among the following is:

(a) malachite

(b) magnesite

(c) magnetite

(d) Karnalite

Cupellation process is used in the metallurgy of:

(a) copper

(b) silver

(c) lead

(d) iron

Blood haemoglobin contains:  

(a) Al

(b) Mg

(c) Cu

(d) Fe

Wolframite ore contains:

(a) Zn

(b) W

(c) Hf

(d) Au

Roasting is generally carried out in case of :

(1) oxide ores

(2) sulphide ores

(3) silicate ores

(4) carbonate ores

Alloy is an example of:

(1) gel

(2) aerosol

(3) solid sol

(4) emulsion

Nickel is purified by thermal decomposition of its:

(1) Hydride

(2) Chloride

(3) Azide

(4) Carbonyl

4M + 8CN^- + 2H₂O + O₂$\to$ 4[M(CN)₂]^- + 4OH^-

2[M(CN)₂]^- + Zn$\to$[Zn(CN)₄]^2- + 2M

The metal M in above-mentioned reaction is:

1. Nickel

2. Silver

3. Copper

4. Mercury