When copper turnings and concentrated $HCl$ are heated with copper sulphate,the compound formed is:

Write about the utility of $d$- and $f$-block elements and their compounds. Or describe the following uses of $d$- and $f$-block elements and their compounds: $(i)$ In iron/steel $(ii)$ As pigments $(iii)$ In batteries $(iv)$ In coinage $(v)$ As catalysts.

Which of the following substances will not give the borax bead test?

The color of acidified $K_2Cr_2O_7$ is not changed by:

Chrome yellow is chemically known as

Assertion: $KMnO_4$ is purple in colour due to charge transfer.
Reason: There is no electron present in $d$-orbitals of Manganese in $MnO_4^-$.