Problem 24
Water softening by Clarke's process uses (a) potash alum (b) calcium bicarbonate (c) calcium hydroxide (d) sodium bicarbonate
Problem 25
By which of the following process permanent hardness of water can be removed? (a) washing soda (b) soda lime (c) sodium chloride (d) sodium bicarbonate
Problem 26
When two ice cubes are pressed over each other, they unite to form one cube. Which of the following forces is responsible to hold them together? (a) van der Waals forces (b) covalent attraction (c) ionic interaction (d) hydrogen bond formation
Problem 27
\(\mathrm{H}_{2} \mathrm{O}_{2}\) exists as .... in alkaline medium. (a) \(\mathrm{HO}_{2}+\) (b) \(\mathrm{H}_{2} \mathrm{O}+\) (c) \(\mathrm{HO}_{2}-\) (d) \(\mathrm{O}_{2}^{2}-\)
Problem 28
Structure of \(\mathrm{H}_{2} \mathrm{O}_{2}\) is (a) planar (b) linear (c) non planar (d) three dimensional
Problem 29
The \(\mathrm{H}-\mathrm{O}-\mathrm{O}\) bond angle in \(\mathrm{H}_{2} \mathrm{O}_{2}\) is (a) \(97^{\circ}\) (b) \(106^{\circ}\) (c) \(104.5^{\circ}\) (d) \(109.28^{\circ}\)
Problem 31
A variety of water which contains soluble salts of \(\mathrm{Ca}\) and \(\mathrm{Mg}\) is known as (a) soft water (b) heavy water (c) conductivity water (d) hard water
Problem 32
Which of the following is reduced by hydrogen peroxide in acidic medium? (a) ferrous sulphate (b) potassium iodide (c) potassium ferrocyanide (d) potassium permanganate
Problem 34
In which of the following reactions does hydrogen peroxide acts as a reducing agent? (a) \(2 \mathrm{KI}+\mathrm{H}_{2} \mathrm{O}_{2}+\mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow \mathrm{K}_{2} \mathrm{SO}_{4}+\mathrm{I}_{2}+\mathrm{H}_{2} \mathrm{O}\) (b) \(\mathrm{Ag}_{2} \mathrm{O}\) (moist) \(+\mathrm{H}_{2} \mathrm{O}_{2} \rightarrow 2 \mathrm{Ag}+\mathrm{H}_{2} \mathrm{O}+\mathrm{O}_{2}\) (c) \(\mathrm{Na}_{2} \mathrm{SO}_{3}+\mathrm{H}_{2} \mathrm{O}_{2} \rightarrow \mathrm{Na}_{2} \mathrm{SO}_{4}+\mathrm{H}_{2} \mathrm{O}\) (d) \(\mathrm{PbS}+4 \mathrm{H}_{2} \mathrm{O}_{2} \rightarrow \mathrm{PbSO}_{4}+4 \mathrm{H}_{2} \mathrm{O}\)
Problem 35
In which of the following reactions does \(\mathrm{H}_{2} \mathrm{O}_{2}\) acts as a reducing agent? (a) \(\mathrm{PbO}_{2}(\mathrm{~s})+\mathrm{H}_{2} \mathrm{O}_{2}(\mathrm{aq}) \longrightarrow \mathrm{PbO}(\mathrm{s})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l})\) \(+\mathrm{O}_{2}(\mathrm{~g})\) (b) \(\mathrm{KNO}_{2}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}_{2}(\mathrm{aq}) \longrightarrow \mathrm{KNO}_{3}(\mathrm{aq})+\) \(\mathrm{H}_{2} \mathrm{O}(\mathrm{l})\) (c) \(2 \mathrm{KI}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}_{2}(\mathrm{aq}) \longrightarrow 2 \mathrm{KOH}(\mathrm{aq})+\) (d) \(\mathrm{Na}_{2} \mathrm{SO}_{3}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}_{2}(\mathrm{aq}) \stackrel{\mathrm{I}_{2}(\mathrm{~s})}{\longrightarrow} \mathrm{Na}_{2} \mathrm{SO}_{4}(\mathrm{aq})\) \(+\overline{\mathrm{H}}_{2} \mathrm{O}(\mathrm{l})\)
