Chapter 16

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

The correct order of the thermal stability of hydrogen halides \((\mathrm{H}-\mathrm{X})\) is (a) \(\mathrm{HCl}>\mathrm{HF}>\mathrm{HBr}>\mathrm{HI}\) (b) \(\mathrm{HI}>\mathrm{HCl}>\mathrm{HF}>\mathrm{HBr}\) (c) \(\mathrm{HI}>\mathrm{HBr}>\mathrm{HCl}>\mathrm{HF}\) (d) \(\mathrm{HF}>\mathrm{HCl}>\mathrm{HBr}>\mathrm{HI}\)

The molecular shapes of \(\mathrm{SF}_{4}, \mathrm{CF}_{4}\), and \(\mathrm{XeF}_{4}\) are (a) different with 1,0 and 2 lone pairs of electrons on the central atoms respectively (b) different with 0,1 and 2 lone pairs of electrons on the central atoms respectively (c) the same with 1,1 and 1 lone pair of electrons on the central atoms respectively (d) the same with 2,0 and 1 lone pair of electrons on the central atoms respectively

Which of the following chemical reactions depicts the oxidizing behaviour of \(\mathrm{H}_{2} \mathrm{SO}_{4} ?\) (a) \(2 \mathrm{HI}+\mathrm{H}_{2} \mathrm{SO}_{4} \longrightarrow \mathrm{I}_{2}+\mathrm{SO}_{2}+2 \mathrm{H}_{2} \mathrm{O}\) (b) \(\mathrm{Ca}(\mathrm{OH})_{2}+\mathrm{H}_{2} \mathrm{SO}_{4} \longrightarrow \mathrm{CaSO}_{4}+2 \mathrm{H}_{2} \mathrm{O}\) (c) \(\mathrm{NaCl}+\mathrm{H}_{2} \mathrm{SO}_{4} \stackrel{2}{\longrightarrow} \mathrm{NaHSO}_{4}+\mathrm{HCl}\) (d) \(2 \mathrm{PCl}_{5}+\mathrm{H}_{2} \mathrm{SO}_{4} \longrightarrow 2 \mathrm{POCl}_{3}+2 \mathrm{HCl}+\mathrm{SO}_{2} \mathrm{Cl}_{2}\)

What products are expected from the disproportionation reaction of hypochlorous acid? (a) \(\mathrm{HClO}_{3}\) and \(\mathrm{Cl}_{2} \mathrm{O}\) (b) \(\mathrm{HClO}_{2}\) and \(\mathrm{HClO}_{4}\) (c) \(\mathrm{HCl}\) and \(\mathrm{Cl}_{2} \mathrm{O}^{2}\) (d) \(\mathrm{HCl}\) and \(\mathrm{HClO}_{3}\)

Which of the following statements is true? (a) \(\mathrm{H}_{3} \mathrm{PO}_{3}\) is a stronger acid than \(\mathrm{H}_{2} \mathrm{SO}_{3}\) (b) in aqueous medium HF is a stronger acid than \(\mathrm{HCl}\) (c) \(\mathrm{HClO}_{4}\) is a weaker acid than \(\mathrm{HClO}_{3}\) (d) \(\mathrm{HNO}_{3}\) is a stronger acid than \(\mathrm{HNO}_{2}\)

Regular use of which of the following fertilizers increases the acidity of soil? (a) urea (b) super phosphate of lime (c) ammonium sulphate (d) potassium nitrate

Identify the incorrect statement among the following: (a) silicon reacts with \(\mathrm{NaOH}\) (aq) in the presence of air to give \(\mathrm{Na}_{2} \mathrm{SiO}_{3}\) and \(\mathrm{H}_{2} \mathrm{O}\) (b) \(\mathrm{Cl}_{2}\) reacts with excess of \(\mathrm{NH}_{3}\) to give \(\mathrm{N}_{2}\) and \(\mathrm{HCl}\) (c) \(\mathrm{Br}_{2}\) reacts with hot and strong \(\mathrm{NaOH}\) solution to give \(\mathrm{NaBr}, \mathrm{NaBrO}_{4}\) and \(\mathrm{H}_{2} \mathrm{O}\) (d) ozone reacts with \(\mathrm{SO}_{2}\) to give \(\mathrm{SO}_{3}\)

Which one of the following reactions of Xenon compound is not feasible? (a) \(3 \mathrm{XeF}_{4}+6 \mathrm{H}_{2} \mathrm{O} \longrightarrow 2 \mathrm{Xe}+\mathrm{XeO}_{3}+12 \mathrm{HF}+1.5 \mathrm{O}_{2}\) (b) \(2 \mathrm{XeF}_{2}+2 \mathrm{H}_{2} \mathrm{O} \longrightarrow 2 \mathrm{Xe}+4 \mathrm{HF}+\mathrm{O}_{2}\) (c) \(\mathrm{XeF}_{6}+\mathrm{RbF} \longrightarrow \mathrm{Rb}\left[\mathrm{XeF}_{7}\right]\) (d) \(\mathrm{XeO}_{3}+6 \mathrm{HF} \longrightarrow \mathrm{XeF}_{6}+3 \mathrm{H}_{2} \mathrm{O}\)

Three reactions involving \(\mathrm{H}_{2} \mathrm{PO}_{4}^{-}\)are given below: (i) \(\mathrm{H}_{3} \mathrm{PO}_{4}+\mathrm{H}_{2} \mathrm{O} \longrightarrow \mathrm{H}_{3} \mathrm{O}^{+}+\mathrm{H}_{2} \mathrm{PO}_{4}^{-}\) (ii) \(\mathrm{H}_{2} \mathrm{PO}_{4}^{-}+\mathrm{H}_{2} \mathrm{O} \longrightarrow \mathrm{HPO}_{4}^{2-}+\mathrm{H}_{3} \mathrm{O}^{+}\) (iii) \(\mathrm{H}_{2} \mathrm{PO}_{4}^{-}+\mathrm{OH}^{2} \longrightarrow \mathrm{H}_{3} \mathrm{PO}_{4}+\mathrm{O}^{3}\) In which of the above does \(\mathrm{H}_{2} \mathrm{PO}_{4}^{-}\)act as an acid? (a) (ii) only (b) (i) and (ii) (c) (iii) only (d) (i) only