Problem 54
The reaction of slaked lime with \(\mathrm{Cl}_{2} \mathrm{gas}\) gives (a) a mixture of \(\mathrm{Ca}(\mathrm{OCl})_{2}, \mathrm{Ca}(\mathrm{OH}), \mathrm{CaCl}_{2}\) and \(\mathrm{H}_{2} \mathrm{O}\) (b) quick lime (c) Baryta water (d) only \(\mathrm{Ca}(\mathrm{OCl})_{2}\)
Problem 55
The compound insoluble in acetic acid is (a) calcium oxide (b) calcium carbonate (c) calcium oxalate (d) calcium hydroxide
Problem 56
The hydration energy or \(\mathrm{Mg}^{2+}\) ions is higher than that of (a) \(\mathrm{Al}^{3+}\) (b) \(\mathrm{Be}^{2+}\) (c) \(\mathrm{Na}^{+}\) (d) none of these
Problem 57
On heating quick lime with coke in an electric furnace, we get (a) \(\mathrm{CaC}_{2}\) (b) \(\mathrm{CaCO}_{3}\) (c) \(\mathrm{CaO}\) (d) \(\mathrm{Ca}\) and \(\mathrm{CO}_{2}\)
Problem 58
Limestone is not used in which of the following manufacturing processes? (a) Portland cement (b) phosphorus from phosphorite (c) iron form haematite (d) Solvay process of sodium carbonate
Problem 59
Solution of \(\mathrm{MgCl}_{2}\) in water has \(\mathrm{pH}\) value (a) 7 (b) \(>7\) (c) \(<7\) (d) \(14.2\)
Problem 60
A solution of \(\mathrm{Ca}\) in liquid ammonia when evaporated to dryness gives as residue of (a) \(\left[\mathrm{Ca}\left(\mathrm{NH}_{3}\right) \mathrm{x}\right]^{2+}\) (b) \(\mathrm{Ca}\left(\mathrm{NH}_{3}\right)_{6}\) (c) pure Ca (d) \(\left[\mathrm{Ca}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+}\)
Problem 61
Magnesium can be obtained by (a) reducing magnesium salt solution with \(\mathrm{Fe}\) (b) electrolysis of fused magnesium salt (c) electrolysis of \(\mathrm{Mg}\left(\mathrm{NO}_{3}\right)_{2}\) solution (d) reducing \(\mathrm{MgO}\) with coke
Problem 62
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) \(\mathrm{CaCl}_{2} . \mathrm{NH}_{4} \mathrm{Cl} .2 \mathrm{H}_{2} \mathrm{O}\) (d) \(\mathrm{CaCl}_{2} \cdot\left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4} \cdot \mathrm{H}_{2} \mathrm{O}\)
Problem 63
Fluorosis disease is caused due to the reaction of \(\ldots \ldots\). with excess of fluoride in the body. (a) \(\mathrm{Mg}\) (b) \(\mathrm{Fe}\) (c) \(\mathrm{K}\) (d) \(\mathrm{Ca}\)
