Chrome yellow is chemically known as

Which of the following are used as catalysts in petroleum cracking?

Which of the following compounds is used as the starting material for the preparation of potassium dichromate?

On heating potassium permanganate,one of the following compounds is not obtained:

The spin-only magnetic moment value of the most basic oxide of vanadium among $V_2O_3$,$V_2O_4$,and $V_2O_5$ is $..... \ B.M.$ (Nearest Integer).

The first transition series metal $M$ has the highest enthalpy of atomisation in its series. One of its aquated ion $(M^{n+})$ exists in green colour. The nature of the oxide formed by the above $M^{n+}$ ion is $:$