91Ó°ÊÓ

Which of rhe following rcacrs wirh \(\mathrm{BCl}_{3}\) to form diboranc? (a) \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) (b) \(\mathrm{Nll}_{3}\) (c) Nal Ig (d) LiAlI I

In the reaction \(\mathrm{B}_{2} \mathrm{H}_{6}, 2 \mathrm{KOH} \times 2(\Lambda) \longrightarrow 2(\mathrm{~B}) \times 6 \mathrm{H}_{2}\) (a) and (b) are, respectively (a) \(\mathrm{HCl}, \mathrm{KBO}_{3}\) (b) \(11_{2}, 1 \mathrm{I}_{3} \mathrm{BO}_{3}\) (c) \(\mathrm{H}_{2} \mathrm{O}, \mathrm{KBO}_{2}\) (d) \(11, \mathrm{O}, \mathrm{KBO}_{3}\)

\(\mathrm{BCl}_{3}\) does not exist as a dimmer but \(\mathrm{BH}_{3}\) exists as \(\mathrm{B}_{2} \mathrm{H}_{6}\) because (a) \(C_{2}\) is more electronegative than hydrogen. (b) large size of the chlorine atom does not fit between the small sized boron atoms, while small sized hydrogen atoms occupy the space between boron atoms. (c) there is p\pi \(=\mathrm{d} \pi\) back bonding in \(\mathrm{BCl}_{3}\). (d) both (b) and (c)

The structure of diborane \(\left(\mathrm{B}_{2} 11_{6}\right)\) conrains (a) four \(2 c-2 \mathrm{c}\) bonds and rwo \(3 c-2 \mathrm{c}\) bonds (b) two \(2 c-2 e\) bonds and four \(3 c-2 e\) bonds (c) two \(2 c-2 e\) bonds and two \(3 c-3 e\) bonds (d) four \(2 c-2 c\) bonds and four \(3 c-2 c\) bonds

The correct order of acidic nature of oxides is in the order (a) \(\mathrm{N}_{2} \mathrm{O}_{5}<\mathrm{N}_{2} \mathrm{O}_{3}<\mathrm{NO}_{2}<\mathrm{NO}<\mathrm{N}_{2} \mathrm{O}\) (b) \(\mathrm{N}_{2} \mathrm{O}<\mathrm{NO}<\mathrm{N}_{2} \mathrm{O}_{3}<\mathrm{NO}_{2}<\mathrm{N}_{2} \mathrm{O}_{5}\) (c) \(\mathrm{N}_{2} \mathrm{O}_{5}<\mathrm{N}_{2} \mathrm{O}<\mathrm{N}_{2} \mathrm{O}_{3}<\mathrm{NO}<\mathrm{N}_{2} \mathrm{O}\) (d) \(\mathrm{NO}<\mathrm{N}_{2} \mathrm{O}<\mathrm{N}_{2} \mathrm{O}_{3}<\mathrm{NO}_{2}<\mathrm{N}_{2} \mathrm{O}_{3}\)

Phosphone, acetylene and ammonia can be formed by rearing water with (a) \(\mathrm{M}_{\mathrm{S}_{3}} \mathrm{P}_{2}, \mathrm{Al}_{1} \mathrm{C}_{3}, \mathrm{~L} \mathrm{i}_{3} \mathrm{~N}\) (b) \(\mathrm{Ca}_{3} \mathrm{P}_{2}, \mathrm{M}_{\mathrm{S}_{2}} \mathrm{C}, \mathrm{NH}_{4} \mathrm{NO}_{3}\) (c) \(\mathrm{Ca}_{3} \mathrm{P}_{2}, \mathrm{CaC}_{2}, \mathrm{CaCN}_{2}\) (d) \(\mathrm{Ca}_{2} \mathrm{P}_{2}, \mathrm{CaC}_{2}, \mathrm{Mg}, \mathrm{N}_{2}\)

\(\mathrm{N} 1 \mathrm{l}_{3}\) is converted ro hydra-zinc generally by reation with which of the following? (a) \(\mathrm{CO}\) (b) \(\mathrm{SnCl}_{2}\) (c) \(\mathrm{NaOCl}\) (d) \(\mathrm{NaOF}\)

Cl P CI bond angles in \(\mathrm{PCl}_{3}\) molecule are (a) \(120^{\circ}\) and \(90^{\circ}\) (b) \(60^{\circ}\) and \(90^{\circ}\) (c) \(60^{\circ}\) and \(120^{\circ}\) (d) \(120^{\circ}\) and \(30^{\circ}\)

When concentrated \(11 \mathrm{NO}_{3}\) decomposes slowly in sunlight. Ir gives (a) Brown colour (b) Green colour (c) Yellow colour (d) Blue colour

The number of hydrogen atom(s) attached to phosphorous atom in hypo- phosphorous acid is (a) zero (b) two (c) one (d) three