Question

the moderately reactive metals like Zn, Fe , Pb etc are not found in the earth crust as
a) sulphides
b) carbonates
c) oxides
d) hydroxides

Answer 1

the moderately reactive metals like Zn, Fe , Pb etc are not found in the earth crust as
d) hydroxides........
Zn,Fe,Pb are not found in the earth crust because they are less reactive than hydrogen

Answer 2

Answer:

The correct option is d) hydroxides.

Explanation:

The moderately reactive metals like Zn, Fe, Pb etc are not found in the earth crust as hydroxides because they are less reactive than hydrogen and hence do not form hydroxide compounds with it.

But they are more reactive than sulphides, carbonates and oxides. This is the reason why we find zinc oxides, zinc carbonates and zinc sulphides, ferrous oxides, lead carbonates etc. in the earth's crust but not zinc hydoxides, ferrous hydroxides or lead hydroxides.

Thus, the answer is moderately reactive metals like Zn, Fe, Pb are not found in the earth's crust as hydroxides.