91Ó°ÊÓ

Which of the following has \(\mathrm{S}-\mathrm{S}\) bond? (a) \(\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{7}\) (b) \(\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{6}\) (c) \(\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{8}\) (d) Mustard gas

Sodium thiosulphate is prepared by (a) reducing \(\mathrm{Na}_{2} \mathrm{SO}_{4}\) solution with \(\mathrm{H}_{2} \mathrm{~S}\) (b) boiling \(\mathrm{Na}_{2} \mathrm{SO}_{3}\) solution with \(\mathrm{S}\) in alkaline medium (c) neutralizing \(\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}\) solution with \(\mathrm{NaOH}\) (d) boiling \(\mathrm{Na}_{2} \mathrm{SO}_{3}\) solution wit

A bottle completely filled with conc. \(\mathrm{H}_{2} \mathrm{SO}_{4}\) is left unstoppered for several days and we observe spontaneous overflow of acid. It is due to (a) dehydration of \(\mathrm{H}_{2} \mathrm{SO}_{4}\) (b) absorption of air by \(\mathrm{H}_{2} \mathrm{SO}_{4}\) (c) hygroscopic nature of \(\mathrm{H}_{2} \mathrm{SO}_{4}\) (d) change in temperature

In \(\mathrm{SO}_{3}^{2-}\) (a) there is sp \(^{3}\) hybridized sulphur atom (b) bonds between \(\mathrm{S}\) and \(\mathrm{O}\) are equivalents (c) \(\mathrm{d} \pi-\mathrm{p} \pi\) bond between \(\mathrm{S}\) and \(\mathrm{O}\) is delocalized (d) all the facts given here are true

Which of the following sequence is correct with reference to the oxidation number of iodine? (a) \(\mathrm{HI}<\mathrm{I}_{2}<\mathrm{ICl}<\mathrm{HIO}_{4}\) (b) \(\mathrm{I}_{2}<\mathrm{HI}<\mathrm{ICl}<\mathrm{HIO}_{4}\) (c) \(\mathrm{HIO}_{4}<\mathrm{ICl}<\mathrm{I}_{2}<\mathrm{HI}\) (d) \(\mathrm{I}_{2}<\mathrm{ICl}<\mathrm{HI}<\mathrm{HIO}_{4}\)

Which of the following attacks glass? (a) \(\mathrm{HCl}\) (b) \(\mathrm{HBr}\) (c) \(\mathrm{HI}\) (d) HF

Which species has the maximum number of lone pair of electrons on the central atom? (a) \(\left[\mathrm{I}_{3}\right]\) (b) \(\mathrm{XeF}_{4}\) (c) \(\mathrm{SF}_{4}\) (d) \(\left[\mathrm{ClO}_{3}\right]\)

Hydrolysis of \(\mathrm{NCl}_{3}\) gives \(\mathrm{NH}_{3}\) and \(\mathrm{X}\). Which of the following is \(\mathrm{X} ?\) (a) \(\mathrm{HClO}_{4}\) (b) \(\mathrm{HClO}_{3}\) (c) \(\mathrm{HOCl}\) (d) \(\mathrm{HClO}_{2}\)

Which of the following is the strongest acid? (a) \(\mathrm{ClO}_{3}(\mathrm{OH})\) (b) \(\mathrm{ClO}_{2}(\mathrm{OH})\) (c) \(\mathrm{SO}(\mathrm{OH})_{2}\) (d) \(\mathrm{SO}_{2}(\mathrm{OH})_{2}\)

Which is the best description of the behaviour of bromine in the reaction given below? \(\mathrm{H}_{2} \mathrm{O}+\mathrm{Br}_{2} \longrightarrow \mathrm{HOBr}+\mathrm{HBr}\) (a) reduced only (b) oxidized only (c) both oxidized and reduced (d) proton acceptor only