The formula for iron $(III)$ hexacyanoferrate $(II)$ is ..........

The coordination number of $Fe$ in the complexes $[Fe(CN)_6]^{4-}$,$[Fe(CN)_6]^{3-}$ and $[FeCl_4]^-$ would be respectively:

Identify the neutral complex from the following.

When $0.1 \ mol$ of $CoCl_3(NH_3)_5$ is treated with an excess of $AgNO_3$,$0.2 \ mol$ of $AgCl$ are obtained. The formula of the compound is:

Which of the following statements is incorrect?

Which of the following is the formula of tartar emetic?