Problem 22
Silica is soluble in: (a) HF (b) \(\mathrm{HNO}_{3}\) (c) \(\mathrm{H}_{2} \mathrm{SO}_{4}\) (d) \(\mathrm{HCl}\)
Problem 23
From \(\mathrm{B}_{2} \mathrm{H}_{6}\), all the following can be prepared except (a) \(\mathrm{B}_{2}\left(\mathrm{CH}_{3}\right)_{6}\) (b) \(\mathrm{NaBH}_{4}\) (c) \(\mathrm{B}_{2} \mathrm{O}_{3}\) (d) \(\mathrm{H}_{3} \mathrm{BO}_{3}\)
Problem 23
Which of the following halide of carbon is used as refrigerant? (a) \(\mathrm{CCl}_{4}\) (b) \(\mathrm{CF}_{4}\) (c) \(\mathrm{CH}_{2} \mathrm{Cl}_{2}\) (d) \(\mathrm{CH}_{2} \mathrm{~F}_{2}\)
Problem 24
Inorganic benzene contains (a) \(\mathrm{C}, \mathrm{N}, \mathrm{H}\) (b) C, H, Al (c) \(\mathrm{C}, \mathrm{H}, \mathrm{B}\) (d) B, N, H
Problem 24
Which one of the following carbides is most likely to be non-stoichiometric? (a) \(\mathrm{SiC}\) (b) \(\mathrm{CaC}_{2}\) (c) \(\mathrm{Fe}_{3} \mathrm{C}\) (d) None of these
Problem 25
\(\mathrm{SiO}_{2}\) is reacted with sodium carbonate. What is the gas liberated? (a) \(\mathrm{O}_{2}\) (b) \(\mathrm{O}_{3}\) (c) CO (d) \(\mathrm{CO}_{2}\)
Problem 25
Boric acid when burnt with ethyl alcohol gives a green edged flame due to (a) Metaboric acid (b) Boric anhydride (c) Orthoboric acid (d) Ethyl borate
Problem 26
The component present in greater proportion in water gas is: (a) \(\mathrm{CO}\) (b) \(\mathrm{H}_{2}\) (c) \(\mathrm{CO}_{2}\) (d) \(\mathrm{CH}_{4}\)
Problem 26
Which one is metaboric acid? (a) \(\mathrm{B}(\mathrm{OH})_{3}\) (b) \(\mathrm{H}_{3} \mathrm{BO}_{3}\) (c) \(\mathrm{H}_{2} \mathrm{~B}_{4} \mathrm{O}_{7}\) (d) \(\mathrm{HBO}_{2}\)
Problem 27
Amorphous boron on burning in air forms (a) Mixture of \(\mathrm{B}_{2} \mathrm{O}_{3}\) and \((\mathrm{BN})_{\mathrm{x}}\) (b) \(\mathrm{B}(\mathrm{OH})_{3}\) (c) Only (BN) \(_{x}\) (d) Only \(\mathrm{B}_{2} \mathrm{O}_{3}\)
