Problem 44
What is the crystal structure of cesium chloride? (a) Tetrahedral (b) Octahedral (c) Face centred cubic (d) Body centerd cubic
Problem 46
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) \(\mathrm{Na}_{2} \mathrm{O}_{2}\) (c) \(\mathrm{NaAlO}_{2}\) (d) \(\mathrm{Na}_{2} \mathrm{O}\)
Problem 47
Aqueous NaCl solution is electrolysed using platinum electrodes. What is the product formed at cathode? (a) \(\mathrm{O}_{2}\) (b) \(\mathrm{Cl}_{2}\) (c) \(\mathrm{H}_{2}\) (d) \(\mathrm{Na}\)
Problem 48
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) \(\mathrm{K}_{2} \mathrm{HCO}_{3}\) (b) \(\mathrm{K}_{2} \mathrm{CO}_{3}\) (c) \(\mathrm{KOH}\) (d) \(\mathrm{K}_{2} \mathrm{SO}_{4}\)
Problem 49
Solution of \(\mathrm{MgCl}_{2}\) in water has \(\mathrm{pH}\) value: (a) 7 (b) \(>7\) (c) \(<7\) (d) \(14.2\)
Problem 50
The compound formed when gypsum is dissolved in aqueous ammonium sulphate solution is: (a) \(\mathrm{CaSO}_{4} \cdot \mathrm{NH}_{3} \mathrm{Cl} . \mathrm{H}_{2} \mathrm{O}\) (b) \(\mathrm{CaSO}_{4} \cdot\left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4} \cdot \mathrm{H}_{2} \mathrm{O}\) (c) \(\mathrm{CaCl}_{2} \cdot \mathrm{NH}_{4} \mathrm{Cl}_{2} \mathrm{H}_{2} \mathrm{O}\) (d) \(\mathrm{CaCl}_{2} .\left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4} \cdot \mathrm{H}_{2} \mathrm{O}\)
Problem 51
Alkali metals have high oxidation potential and hence they behave as: (a) Electrolytes (b) Lewis bases (c) Oxidizing agents (d) Reducing agents
Problem 52
"Fluorosis" disease is caused due to the reaction of \(\ldots \ldots \ldots . .\) with excess of fluoride in the body. (a) \(\mathrm{Mg}\) (b) \(\mathrm{Fe}\) (c) \(\mathrm{K}\) (d) \(\mathrm{Ca}\)
Problem 53
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 55
In curing cement plasters, water is sprinkled from time to time. This helps in: (a) Hydrated sand gravel mixed with cement (b) Keeping it cool (c) Converting sand into silicic acid (d) Developing interlocking needle like crystals of hydrated silicates
