One of the important uses of ferrous sulphate is in the

The ionic charges on chromate ion and dichromate ion respectively are:

Which of the following statements regarding copper salts is not true?

Ferrosilicon is used in the steel industry as:

Which of the following statements is incorrect for $KMnO_4$?

Among $CrO$,$Cr_2O_3$,and $CrO_3$,the sum of spin-only magnetic moment values of basic and amphoteric oxides is . . . . . . . . $10^{-2} \ BM$ (nearest integer).
(Given atomic number of $Cr$ is $24$)