Question 1

Which of the following has least tendency to liberate H , from mineral acids?

Accepted Answer

In reactivity series, Cu lies below Hydrogen and it is least electropositive among the given metals.

Question 2

The metal that shows highest and maximum number of oxidation state is:

Accepted Answer

Mn shows highest oxidation state of +7 in 3d series metals. Ti; Co and Fe shows highest. Oxidation state of +4,+4 and +6 respectively. Oxidation state of +4,+4 and +6 respectively.

Question 3

In the laboratory, manganese (II) salt is oxidise to permanganate ion in aqueous solution by

Accepted Answer

In laboratory, manganese (II) ion salt is oxidised to permanganate ion in aqueous solution by peroxodisulphate. 2 Mn ^ 2+ + peroxodisulphate ion 5 ~S _2 O _8^ 2- +8 H _2 O 2 MnO _4^ - +10 SO _4^ 2- +16 H ^ +

Question 4

Which is not the correct statement? (At. nos. Ce =58, Lu =71, La =57, Yb =70 )

Accepted Answer

Option(a) is incorrect as Yb ^ 3+ is colorless.

d and f Block Elements — Previous Year Questions & Solutions