Problem 33
Sodium metal reacts with \(\mathrm{Al}_{2} \mathrm{O}_{3}\) at high temperature to give a sodium compound X.X reacts with carbon dioxide in water to form \(Y Y\) is ...... (a) \(\mathrm{Na}_{2} \mathrm{CO}_{3}\) (b) \(\mathrm{Na}_{4} \mathrm{O}_{2}\) (c) \(\mathrm{NaAlO}_{2}\) (d) \(\mathrm{Na}_{2} \mathrm{O}\)
Problem 34
Aqueous solution of \(\mathrm{NaCl}\) is electrolyzed using platimum electrodes. What is the product formed at the cathode? (a) \(\mathrm{O}_{2}\) (b) \(\mathrm{Cl}_{2}\) (c) \(\mathrm{H}_{2}\) (d) \(\mathrm{Na}\)
Problem 35
Oxalic acid reacts with concentrated \(\mathrm{H}_{2} \mathrm{SO}_{4}\) to give a mixture of two gases. When this mixture is passed through caustic potash, one of the gases is absorbed. What is the product formed by the absorbed gas with caustic potash? (a) \(\mathrm{KHCO}_{3}\) (b) \(\mathrm{K}_{2} \mathrm{CO}_{3}\) (c) \(\mathrm{KOH}\) (d) \(\mathrm{K}_{2} \mathrm{SO}_{4}\)
Problem 36
In organic reactions, sodium in liquid ammonia is used as ....... (a) oxidizing agent (b) reducing agent (c) hydrolyzing agent (d) precipitating agent
Problem 38
Which of the following ore contains both calcium and magncsium? (a) lime stone (b) dolomite (c) epsom salt (d) carnalite
Problem 39
Magnesium does not decompose in (a) hot water (b) steam (c) semi hot water (d) cold water
Problem 40
Which of the following is the composition of carnalite? (a) \(\mathrm{Mg} \mathrm{Cl}_{2} . \mathrm{KCl}_{2} 6 \mathrm{H}_{2} \mathrm{O}\) (b) \(\mathrm{Fe}_{3} \mathrm{O}_{4}\) (c) \(\mathrm{Na}_{3} \mathrm{AIF}_{5}\) (d) \(\mathrm{Na}_{2} \mathrm{Al}_{2} \mathrm{O}_{3}\)
Problem 41
Which of the following is produced when magnesium reacts with hot concentrated \(\mathrm{H}_{2} \mathrm{SO}_{4} ?\) (a) \(\mathrm{H}_{2}\) (b) \(\underline{\underline{S}}\) (c) \(\mathrm{MgO}\) (d) \(\mathrm{SO}_{2}\)
Problem 42
\(\mathrm{MgCl}_{2} .6 \mathrm{H}_{2} \mathrm{O}\), when heated gives (a) magnesium hydride (b) magnesium chloride (c) magnesium oxide (d) magnesium axychloride
Problem 43
Aqueous solution of carnalite gives a positive test for (a) potassium, magnesium and chloride ions (b) potassium ions only (c) potassium and chloride ions only (d) chloride ions only
