91Ó°ÊÓ

Industrial preparation of nitric acid by ostwald's process involves : (a) oxidation of \(\mathrm{NH}_{3} \quad \square\) (b) reduction of \(\mathrm{NH}_{3}\) (c) hydrogenation of \(\mathrm{NH}_{3} \square\) (d) hydrolysis of \(\mathrm{NH}_{3}\)

Concentrated nitric acid oxidises cane sugar to: (a) \(\mathrm{CO}_{2}\) and \(\mathrm{H}_{2} \mathrm{O}\) \(\square\) (b) \(\mathrm{CO}\) and \(\mathrm{H}_{2} \mathrm{O}\) \(\square\) (c) \(\mathrm{CO}, \mathrm{CO}_{2}\) and \(\mathrm{H}_{2} \mathrm{O}\) \(\square\) (d) oxalic acid and water \(\square\)

White phosphorus reacts with caustic soda. The products are \(\mathrm{PH}_{3}\) and \(\mathrm{NaH}_{2} \mathrm{PO}_{2}\). This reaction is an example of: [B.H.U. 2007] (a) oxidation \(\square\) (b) reduction (c) neutralisation \(\square\) (d) disproportionation

White phosphorus may be removed from red phosphorus by: (a) sublimation \(\square\) (b) distillation (c) dissolving in \(\mathrm{CS}_{2}\) \(\square\) (d) heating in air

Which one of the acids is a dibasic acid? [P.E.T. (Kerala) 2010] (a) \(\mathrm{H}_{3} \mathrm{PO}_{3}\) \(\square\) (b) \(\mathrm{H}_{3} \mathrm{PO}_{2}\) (c) \(\mathrm{HPO}_{3}\) \(\square\) (d) \(\mathrm{H}_{3} \mathrm{PO}_{4}\)

Amongst the trihalides of nitrogen, which one is least basic? (a) \(\mathrm{NF}_{3}\) \(\square\) (b) \(\mathrm{NCl}_{3}\) (c) \(\mathrm{NBr}_{3}\) \(\square\) (d) \(\mathrm{NI}_{3}\)

Which one of the following is the strongest base? (a) \(\mathrm{AsH}_{3}\) \(\square\) (b) \(\mathrm{SbH}_{3}\) (c) \(\mathrm{PH}_{3}\) \(\square\) (d) \(\mathrm{NH}_{3}\)

Skin becomes yellow in conc. \(\mathrm{HNO}_{3}\) because: (a) the proteins are converted into xanthoproteins (b) \(\mathrm{HNO}_{3}\) acts as a dehydrating agent (c) nitrocellulose is formed (d) \(\mathrm{HNO}_{3}\) acts as an oxidising agent

Nitrates of all metals are: (a) insoluble in water \(\square\) (b) soluble in water - (c) unstable \(\square\) (d) coloured 1

A gaseous mixture contains \(\mathrm{O}_{2}\) and \(\mathrm{N}_{2}\) in the ratio of \(1: 4\) by mass. The ratio of their molecules is: (a) \(1: 4\) \(\square\) (b) \(1: 8\) (c) \(3: 6\) \(\square\) (d) \(7: 32\)