Chapter 10

Orthoboric acid \(\left(\mathrm{H}_{3} \mathrm{BO}_{3}\right)\) and metaboric acid \(\left(\mathrm{HBO}_{2}\right)\) differ in respect of (a) Structure (b) Basicity (c) Melting point (d) All of these

The electronic configuration of group III elements is (a) ns \(^{1} \mathrm{np}^{2}\) (b) \(\mathrm{ns}^{1} \mathrm{np}^{3}\) (c) \(\mathrm{ns}^{2} \mathrm{np}^{1}\) (d) \(\mathrm{ns}^{2} \mathrm{np}^{2}\)

\(\mathrm{CO}\) is absorbed by: (a) \(\mathrm{CCl}_{4}\) (b) Pyrogallol (c) Ammonical solution of cuprous chloride (d) \(\mathrm{CHCl}_{3}\)

When a nickel salt is heated with boric anhydride, brown coloured bead is formed which is due to the formation of (a) \(\mathrm{NiO}\) (b) \(\mathrm{Ni}\left(\mathrm{BO}_{2}\right)_{2}\) (c) \(\mathrm{Ni}_{2} \mathrm{~B}_{4} \mathrm{O}_{7}\) (d) None of these

Boric acid is a very weak acid but in presence of certain organic compounds, it acts as a strong acid. Which one of the following organic compounds can affect such change? (a) Acetic acid (b) Glycerol (c) Ethylene (d) Ethyl alcohol

The use of diamond as a gem depends on its: (a) Chemical inertness (b) Hardness (c) Purest form of carbon (d) High refractive index

Which of the following is the electron deficient molecule? (a) \(\mathrm{B}_{2} \mathrm{H}_{6}\) (b) \(\mathrm{SiH}_{4}\) (c) \(\mathrm{PH}_{3}\) (d) \(\mathrm{C}_{2} \mathrm{H}_{6}\)

Fire extinguisher contain a bottle of \(\mathrm{H}_{2} \mathrm{SO}_{4}\) and: (a) \(\mathrm{MgCO}_{3}\) (b) \(\mathrm{CaCO}_{3}\) (c) \(\mathrm{NaHCO}_{3}\) (d) Any carbonate

Which of the following mineral contain \(\mathrm{Al}\) ? (a) Cryolite (b) Mica (c) Felspar (d) All of these

Which of the following is potassium ferricyanide? (a) \(\mathrm{K}_{3}\left[\mathrm{Fe}(\mathrm{CN})_{3}\right]\) (b) \(\mathrm{K}_{3}\left[\mathrm{Fe}(\mathrm{CN})_{4}\right]\) (c) \(\mathrm{K}_{3}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]\) (d) \(\mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]\)