Indicator type silica gel used as a dehumidifier contains

Options

A. `Cu^(2+)` ions
B. `Ni^(2+)` ions
C. `Co^(2+)` ions
D. `Fe^(2+)` ions

Answer

C

Explanation

Indicator type of gel used as a dehumidifier contains `Co^(2+)` ions, when dry it is blue in colour and on absorbing moisture it becomes pink.