Problem 11
The oxidation state of sodium in sodium amalgam is (a) \(-1\) (b) \(+1\) (c) \(+2\) (d) 0
Problem 12
In a reaction, sodium is heated with \(\mathrm{BeCl}_{2}\). In this reaction, sodium acts as (a) precipitating agent (b) hydrolysis agent (c) reducing agent (d) oxidizing agent
Problem 13
Which of the following does not precipitate in the Solvay process, for the manufacture of \(\mathrm{Na}_{2} \mathrm{CO}_{3} ?\) (a) \(\mathrm{CO}_{2}\) (b) \(\mathrm{H}_{2} \mathrm{SO}_{4}\) (c) \(\mathrm{NH}_{3}\) (d) \(\mathrm{NaCl}\) solution
Problem 14
Excess of \(\mathrm{Na}^{4}\) ions in human system causes (a) anaemia (b) high blood pressure (c) diabctes (d) low blood pressure
Problem 16
When \(\mathrm{K}_{2} \mathrm{O}\) is added to water, the solution is basic because it contains a significant concentration of (a) \(\mathrm{OH}^{-}\) (b) \(\mathrm{K}^{+}\) (c) \(\mathrm{O}^{3}\) (d) \(\mathrm{O}_{2}^{2-}\)
Problem 17
Crystalline sodium chloride is a bad conductor of electricity because (a) it contains free molecules (b) the ions present in it are not free to move (c) it does not possess ions (d) it contains only molecules
Problem 18
Aqueous sodium hydroxide reacts with white phosphorous to form phosphine and (a) \(\mathrm{P}_{2} \mathrm{O}_{3}\) (b) \(\mathrm{P}_{2} \mathrm{O}_{5}\) (c) \(\mathrm{NaH}_{2} \mathrm{PO}_{2}\) (d) \(\mathrm{Na}_{3} \mathrm{PO}_{3}\)
Problem 20
In the extraction of sodium by Down's process, cathode and anode are respectively (a) nickel and chromium (b) iron and graphite (c) copper and nickel (d) copper and chromium
Problem 21
In the Castner process of extracting sodium, which of the following reaction occurs at anode (a) \(\mathrm{Na}^{*}+\mathrm{e}^{-} \longrightarrow \mathrm{Na}\) (b) \(4 \mathrm{OH}^{-} \longrightarrow 2 \mathrm{H}_{2} \mathrm{O}+\mathrm{O}_{2}+\mathrm{e}^{-}\) (c) \(\mathrm{H}_{2} \longrightarrow 2 \mathrm{H}^{+}+2 \mathrm{e}^{-}\) (d) \(2 \mathrm{Cl} \longrightarrow \mathrm{Cl}_{2}+2 \mathrm{e}\)
Problem 22
Sodium is heated in air at \(300^{\circ} \mathrm{C}\) to form \(\mathrm{X} . \mathrm{X}\) absorbs \(\mathrm{CO}_{2}\) and forms \(\mathrm{Na}_{2} \mathrm{CO}_{3}\) and \(\mathrm{Y}\). Which of the following is \(\mathrm{Y}\) ? (a) \(\mathrm{O}_{2}\) (b) \(\mathrm{O}_{3}\) (c) \(\mathrm{H}_{2}\) (d) \(\mathrm{H}_{2} \mathrm{O}_{2}\)
