Among the following,the compound that is both paramagnetic and coloured is

Assertion $(A)$: The aqueous solution of $CH_3COONa$ is alkaline in nature. Reason $(R)$: Acetate ion undergoes anionic hydrolysis. The correct answer is

In the conversion of a zinc ore to zinc metal,the process of roasting involves:

Which of the following is a tricarboxylic acid?

Would you expect the second electron gain enthalpy of $O$ to be positive,more negative,or less negative than the first? Justify your answer.

Two rain drops reach the earth with different terminal velocities having ratio $9:4$. Then the ratio of their volumes is