Question 11
Which of the following metals exist in their native state in nature?
(i) $Cu$
(ii) $Au$
(iii) $Zn$
(iv) $Ag$

(a) (i) and (ii)
(b) (ii) and (iii)
(c) (ii) and (iv)
(d) (iii) and (iv)

Q. Identify the rate of reaction of given compounds in

E_{2}

reactions

Q. The correct order of increasing electrical conductivity in aqueous solutions of the following complexes is:
I.

[P t (N H_{3})_{4}] C l_{4}

II.

[C r (N H_{3})_{6}] C l_{3}

III.

[C r (N H_{3})_{4} C l_{2}] C l

IV.

K_{2} [P t C l_{6}]

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Out of the available electrodes for purification of Cu from aqueous solutions, which of these could be used?I. Zn II. Pb III. Graphite IV. Pt

The correct option is A I, IIOption A is correct. Because, Zinc(Zn) and lead(Pb) are more easily oxidised than copper so they are used for purification of copper from aqueous solution.

Out of the available electrodes for purification of $C u$ from aqueous solutions, which of these could be used?
I. $Z n$ II. $P b$ III. Graphite IV. $P t$

The correct option is A I, II
Option A is correct.
Because, Zinc(Zn) and lead(Pb) are more easily oxidised than copper so they are used for purification of copper from aqueous solution.