Question

The metal used to recover copper from a solution of copper sulphate is

A. Na
B. Ag
C. Hg
D. Fe
The number of d-electrons in Fe2+ (Z = 26) is not equal to that of


A. p-electrons in Ne(Z = 10)
B. s-electrons in Mg(Z = 12)
C. d-electrons in Fe(Z = 26)
D. p-electrons in CI(Z = 17)

6.
The metallurgical process in which a metal is obtained in a fused state is called

A. smelting
B. roasting
C. calcinations
D. froth floatation

Answer 1

1. d
Ag & Hg are less reactive than copper. 

adding sodium - it would ignite before it could react. 

Fe is more reaction than copper and would displace it to combine with the sulphate ion, thereby separating copper.
2.Answer: D - p-electrons in CI(Z = 17)
No.of d electrons Fe+2 6(3d6)

no.of p electrons in Ne is 6(2p6),
no.of s electrons in Mg is 6(1s2,2s2,3s2)
no.of d electrons in Fe is 6 (d6)
no.of p electrons in Ci is 11(2p6,3p5)
3. smelting

Answer 2

For no. 1 it is (Fe) it could also be Na sodium but it will be dangerous.

For no. 2 it is Cl(Z=17)

For no. 3 it is smelting (thanks leonaidas23)