31) German silver is an alloy of zinc and:

a) Al
b) Cu and Ni
c) Sn and Ni
d) Cu ANSWER :

ANSWER : Cu and Ni

32) What is the use of Zeigler – Natta catalyst?

a) Polymerization of ethane to produce polythene.
b) Polymerization of alkyne to give benzene.
c) In the Ostwald process for converting NH3 into NO.
d) Oxidizing alcohols to aldehydes.

ANSWER : Polymerization of ethane to produce polythene.

33) The process used for the extraction of gold is:

a) Bayer’s process
b) Sodium amalgam vertical retort process
c) Mac Arthur – Forest cyanide process
d) Parke’s process

ANSWER : Mac Arthur – Forest cyanide process

34) Which among the following metal is colourless?

a) Ni²⁺
b) Cr³⁺
c) Zn²⁺
d) Both a and b

ANSWER : Zn²⁺

35) …………….. is the most reactive metal.

a) Pt
b) Fe
c) Co
d) Ni

ANSWER : Fe

36) Which among the following is a set of transition elements?

a) Zr, Au, Ni
b) Sn, Bi, Mn
c) Hg, Pb, Cu
d) Pt, Cd, Sb

ANSWER : Zr, Au, Ni

37) In which form zinc is present in the ore willemite?

a) ZnCo3
b) ZnS
c) Zn₂SiO₄
d) ZnO

ANSWER : Zn₂SiO₄

38) Which gas is liberated when red hot Zn is dipped in water?

a) H₂

b) O₂

c) Steam

d) Zn vapours.

ANSWER : H₂

39) With decrease in size of cation:

a) Complex forming tendency decreases.
b) Complex forming tendency increases.
c) Complex forming tendency does not change.
d) None of these.

ANSWER : Complex forming tendency increases.

40) Which among the following is true about transition metals?

a) Paramagnetic
b) Form complexes
c) Shows variable oxidation state
d) All of these

ANSWER : All of these    

Part 1   Part 2   Part 3   Part 4   Part 5