Problem 82
\(\mathrm{Li}_{2} \mathrm{O}_{2}\) is formed when: (a) \(\mathrm{LiOH}\) is heated in an atmosphere of \(\mathrm{O}_{2}\) (b) Li is heated strongly is excess of air. (c) \(\mathrm{H}_{2} \mathrm{O}_{2}\) and alcohol are added to a solution of \(\mathrm{LiOH}\) in water. (d) Both (a) and (c).
Problem 83
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) \(\mathrm{H}_{2} \mathrm{O}_{2}\)
Problem 84
Which of the following ore contains both calcium and magnesium? (a) Lime stone (b) Dolomite (c) Epsom salt (d) Carnallite
Problem 85
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) \(\mathrm{BaHSO}_{4}\) (d) \(\mathrm{Ba}(\mathrm{OH})_{2}\)
Problem 86
The hydration energy of \(\mathrm{Mg}^{2+}\) ions is higher than that of: (a) \(\mathrm{Al}^{3+}\) (b) \(\mathrm{Be}^{2+}\) (c) \(\mathrm{Na}^{+}\) (d) none of these
Problem 87
Baking soda is: (a) \(\mathrm{NaHCO}_{3}\) (b) \(\mathrm{Na}_{2} \mathrm{CO}_{3}\) (c) \(\mathrm{NaHCO}_{3} \cdot 6 \mathrm{H}_{2} \mathrm{O}\) (d) \(\mathrm{Na}_{2} \mathrm{CO}_{3} \cdot 10 \mathrm{H}_{2} \mathrm{O}\)
Problem 88
Which of the following exists in polymeric form? (a) \(\mathrm{B}_{2} \mathrm{H}_{6}\) (b) \(\mathrm{AlCl}_{3}\) (c) \(\mathrm{BeCl}_{2}\) (d) \(\mathrm{SiC}\)
Problem 89
Alkali metals present in their compounds are always: (a) Monovalent (b) Bivalent (c) Zerovalent (d) None of these
Problem 90
Crown ethers and cryptans are: (a) Salts of alkali metals (b) Complexes of alkali metals (c) Organic salts of alkali metals (d) Hydroxides of alkali metals used for inorganic quantitative analysis
Problem 91
Which of the following is the composition of carnallite? (a) \(\mathrm{MgCl}_{2} \cdot \mathrm{KCl} \cdot 6 \mathrm{H}_{2} \mathrm{O}\) (b) \(\mathrm{Fe}_{3} \mathrm{O}_{4}\) (c) \(\mathrm{Na}_{3} \mathrm{AlF}_{6}\) (d) \(\mathrm{Na}_{2} \mathrm{Al}_{2} \mathrm{O}_{3}\)
