Problem 23
The product obtained on fusion of \(\mathrm{BaSO}_{4}\) and \(\mathrm{Na}_{2} \mathrm{CO}_{3}\) is (a) \(\mathrm{BaO}\) (b) \(\mathrm{BaCO}_{3}\) (c) \(\mathrm{BaHS}_{4}\) (d) \(\mathrm{Ba}(\mathrm{OH})_{2}\)
Problem 24
A mixture of sodium oxide and calcium oxide are dissolved in water and saturated with excess carbon dioxide gas. The resulting solution is ......It contains \(\ldots \ldots\) (a) acidic \(\mathrm{NaOH}\) and \(\mathrm{CaCO}_{3}\) (b) basic \(\mathrm{Na}_{2} \mathrm{CO}_{3}\) and \(\mathrm{CaCO}_{3}\) (c) neutral \(\mathrm{Na}_{2} \mathrm{CO}_{3}\) and \(\mathrm{CaCO}_{3}\) (d) basic \(\mathrm{NaOH}\) and \(\mathrm{Ca}(\mathrm{OH})\),
Problem 25
Which one of the following electrolysis is used in Down's process of extracting sodium metal? (a) \(\mathrm{NaCl}\) (b) \(\mathrm{NaCl}+\mathrm{NaOH}\) (c) \(\mathrm{NaOH}+\mathrm{KCl}+\mathrm{KF}\) (d) \(\mathrm{NaCl}+\mathrm{KCl}+\mathrm{KF}\)
Problem 26
An aqueous solution of sodium carbonate is alkaline because sodium carbonate is a salt of (a) weak acid and weak base (b) weak acid and strong base (c) strong acid and strong base (d) strong acid and weak base
Problem 27
In Solvay process of manufacture of \(\mathrm{Na}_{2} \mathrm{CO}_{3}\), the by products are (a) \(\mathrm{CaCl}_{2}, \mathrm{CO}_{2}, \mathrm{NH}_{3}\) (b) \(\mathrm{Na}_{2} \mathrm{CO}_{3}, \mathrm{CO}_{2}\) (c) \(\mathrm{NH}_{4} \mathrm{Cl}, \mathrm{CaO}\) (d) \(\mathrm{CaO}, \mathrm{Na}_{2} \mathrm{CO}_{3}\)
Problem 28
On heating sodium metal in a current of dry ammonia, the compound formed is (a) sodium hydride (b) sodium amide (c) sodium azide (d) sodium nitride
Problem 29
In \(\mathrm{NaCl}\), the chloride ions oecupy the space in a fashion of (a) \(\mathrm{BCC}\) (b) FCC (c) both (d) none
Problem 30
When a solution of sodium hydroxide is added in excess to the solution of potash alum, we get (a) a clear solution (b) a crystalline mass (c) a white precipitate (d) bluish white precipitate
Problem 31
The pair of compounds which cannot exist together is (a) \(\mathrm{NaHCO}_{3}\) and \(\mathrm{NaOH}\) (b) \(\mathrm{Na}_{2} \mathrm{CO}_{3}\) and \(\mathrm{NaHCO}_{3}\) (c) \(\mathrm{Na}_{2} \mathrm{CO}_{3}\) and \(\mathrm{NaOH}\) (d) \(\mathrm{NaHCO}_{3}\) and \(\mathrm{NaCl}\)
Problem 32
Sodium nitrate decomposes above \(-800^{\circ} \mathrm{C}\) to give (a) \(\mathrm{N}_{2}\) (b) \(\mathrm{O}_{2}\) (c) \(\mathrm{NO}_{2}\) (d) \(\mathrm{Na}_{2} \mathrm{O}\)
