Problem 114
The compound insoluble in acetic acid is: (a) Calcium oxide (b) Calcium carbonate (c) Calcium oxalate (d) Calcium hydroxide
Problem 116
Sodium sulphate is soluble in water whereas barium sulphate is sparingly soluble because: (a) The hydration energy of sodium sulphate is more than its lattice energy. (b) The lattice energy of barium sulphate is less than its hydration energy. (c) The lattice energy has no role to play in solubility. (d) The hydration energy of sodium sulphate is less than its lattice energy..
Problem 117
In electrolysis of \(\mathrm{NaCl}\) when \(\mathrm{Pt}\) electrode is taken then \(\mathrm{H}_{2}\) is liberated at cathode while with \(\mathrm{Hg}\) cathode, it forms sodium amalgam. The reason for this is: (a) more voltage is required to reduce \(\mathrm{H}^{+}\) at \(\mathrm{Hg}\) than at Pt. (b) concentration of \(\mathrm{H}^{+}\) ions is larger when \(\mathrm{Pt}\) ele trode is taken. (c) Na is dissolved in \(\mathrm{Hg}\) while it does not dissolve in Pt. (d) \(\mathrm{Hg}\) is more inert than \(\mathrm{Pt}\).
Problem 118
The metallic lusture exhibited by sodium is explained by: (a) Diffusion of sodium ions (b) Oscillation of loose electrons (c) Excitation of free electrons (d) Existence of body centred cubic lattice.
Problem 119
When sodium chloride is electrolysed in Nelson's cell, hydrogen is liberated at cathode and not sodium, because: (a) \(\mathrm{H}^{+}\) does not react with water (b) \(\mathrm{H}^{+}\) has lower electrode potential (c) \(\mathrm{H}^{+}\) has greater mobility than \(\mathrm{Na}^{+}\) (d) \(\mathrm{H}^{+}\) is smaller than \(\mathrm{Na}^{+}\)
Problem 120
When zeolite, which is hydrated sodium aluminium silicate, is treated with hard water the sodium ions are exchanged with: 1\. \(\mathrm{H}^{+}\) ions 2\. \(\mathrm{Ca}^{2+}\) ions 3\. \(\mathrm{SO}_{4}^{-2}\) ions 4\. \(\mathrm{Mg}^{2+}\) ions (a) 2,4 (b) \(1,2,3\) (c) \(2,4,5\) (d) all are correct
Problem 121
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 122
In \(\mathrm{NaCl}\), the chloride ions occupy the place in a fashion of: (a) bcc (b) \(\mathrm{fcc}\) (c) both (d) none
Problem 123
Halides of alkaline earth metals form hydrates such as \(\mathrm{MgCl}_{2} \cdot 6 \mathrm{H}_{2} \mathrm{O}, \quad \mathrm{CaCl}_{2} \cdot 6 \mathrm{H}_{2} \mathrm{O}, \quad \mathrm{BaCl}_{2} \cdot 2 \mathrm{H}_{2} \mathrm{O}\) and \(\mathrm{SrCl}_{2} \cdot 2 \mathrm{H}_{2} \mathrm{O} .\) This shows that halides of group 2 elements: (a) Can absorb moisture form air (b) Act as dehydrating agents (c) Are hydroscopic in nature (d) All of the above
Problem 124
Water softening by Clarke's process uses: (a) Potash alum (b) Calcium bicarbonate (c) Calcium hydroxide (d) Sodium bicarbonate
