Problem 102
In which of the following reactions. Hydrogen peroxide acts as a oxidising agent? (1) \(2 \mathrm{KI}+\mathrm{H}_{2} \mathrm{O}_{2}+\mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow \mathrm{K}_{2} \mathrm{SO}_{4}+\mathrm{I}_{2}+\mathrm{H}_{2} \mathrm{O}\) (2) \(\mathrm{Ag}_{2} \mathrm{O}\) (moist) \(+\mathrm{H}_{2} \mathrm{O}_{2} \rightarrow 2 \mathrm{Ag}+\mathrm{H}_{2} \overline{\mathrm{O}}+\mathrm{O}_{2}\) (3) \(\mathrm{Na}_{2} \mathrm{SO}_{3}+\mathrm{H}_{2} \mathrm{O}_{2} \rightarrow \mathrm{Na}_{2} \mathrm{SO}_{4}+\mathrm{H}_{2} \mathrm{O}\) (4) \(\mathrm{PbS}+4 \mathrm{H}_{2} \mathrm{O}_{2} \rightarrow \mathrm{PbSO}_{4}+4 \mathrm{H}_{2} \mathrm{O}\) (a) \(1,2,3\) (b) \(2,3,4\) (c) \(1,2,4\) (d) \(1,3,4\)
Problem 103
Write a balanced net ionic equation for the reaction of bromine with water. (a) \(2 \mathrm{Br}_{2}(\mathrm{~g})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \rightarrow \mathrm{O}_{2}(\mathrm{~g})+4 \mathrm{H}^{+}(\mathrm{aq})+4 \mathrm{Br}^{-}(\mathrm{aq})\) (b) \(\mathrm{Br}_{2}(1)+2 \mathrm{H}_{2} \mathrm{O}(1) \rightarrow 2 \mathrm{HOBr}(\mathrm{aq})+\mathrm{H}_{2}(\mathrm{~g})\) (c) \(\mathrm{Br}_{2}(\mathrm{l})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \rightarrow \mathrm{HOBr}(\mathrm{aq})+\mathrm{H}^{+}(\mathrm{aq})+\mathrm{Br}^{-}(\mathrm{aq})\) (d) \(2 \mathrm{Br}_{2}(1)+2 \mathrm{H}_{2}(\mathrm{l}) \rightarrow \mathrm{O}_{2}(\mathrm{~g})+4 \mathrm{HBr}(\mathrm{aq})\)
Problem 104
The percentage weight of hydrogen in \(\mathrm{H}_{2} \mathrm{O}_{2}\) is: (a) \(6.50\) (b) \(5.88\) (c) 25 (d) 50
Problem 106
Consider the following statements about ortho and para hydrogen. (1) In ortho hydrogen, the spins of the proton are in the same direction. (2) Ortho hydrogen is more stable than para hydrogen at the ambient condition. (3) At ordinary temperature, ordinary hydrogen is a mixture of about \(75 \%\) para and \(25 \%\) ortho forms. (4) The two forms have similar chemical properties, but differ in physical properties like specific heat and thermal conductivity. Which of the statements are correct? (a) 1,2 and 3 (b) 1,2 and 4 (c) 1,3 and 4 (d) 2,3 and 4
Problem 107
10- volume \(\mathrm{H}_{2} \mathrm{O}_{2}\) is equivalent to: (1) \(10 \%\) (2) \(30 \mathrm{~g} / \mathrm{L}\) (3) \(1.786 \mathrm{~N}\) (4) \(3 \% \mathrm{H}_{2} \mathrm{O}_{2}(\mathrm{~W} / \mathrm{V})\) (a) \(1,2,3\) (b) \(1,2,4\) (c) \(2,3,4\) (d) 2,4
Problem 108
The dipole moment of \(\mathrm{H}_{2} \mathrm{O}\) is \(1.85 \mathrm{D}\). The \(\mathrm{O}-\mathrm{H}\) bond moment would be (given the \(\mathrm{H}-\mathrm{O}-\mathrm{H}\) bond angle as \(104.5^{\circ}\) and \(\left.\cos 104.5^{\circ}=-0.25\right)\) (a) \(1.51 \mathrm{D}\) (b) \(2.41 \mathrm{D}\) (c) \(1.86 \mathrm{D}\) (d) \(1.91 \mathrm{D}\)
Problem 110
A compound ' \(\mathrm{x}\) ' is formed by slowly adding calculated quantities of sodium peroxide to ice cold \(20 \%\) solution of the sulphuric acid. Which of the following incorrectly describes the compound ' \(x\) '? (1) It is a mild bleaching agent and its bleaching action is due to reduction. (2) When shaken with potassium dichromate in sulphuric acid and ether, a blue colour is obtained in the ether layer. (3) It is a strong oxidizing agent in acidic medium and has no oxidizing power in alkaline medium. (4) It is a weak monobasic acid. (a) \(2,3,4\) (b) \(1,3,4\) (c) 1,2 , (d) \(1,2,3\)
