Q. No.
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The alkali metals are low melting. Which of the following alkali metal is expected
to melt if the room temperature rises to 30°C?
1. Na
2. K
3. Rb
4. Cs
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Alkali metals react with water vigorously to form hydroxides and dihydrogen.
Which of the following alkali metals reacts with water least vigorously?
1. Li
2. Na
3. K
4. Cs
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The reducing power of a metal depends on various factors. Suggest the factor
which makes Li, the strongest reducing agent in aqueous solution.
1. Sublimation enthalpy
2. Ionisation enthalpy
3. Hydration enthalpy
4. Electron-gain enthalpy
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Metal carbonates decompose on heating to give metal oxide and carbon
dioxide. Which of the metal carbonates is most stable thermally?
1.
2.
3.
4.
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Some of the Group 2 metal halides are covalent and soluble in organic solvents.
Among the following metal halides, the one which is soluble in ethanol is
1.
2.
3.
4.
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The order of decreasing ionisation enthalpy in alkali metals is
1. Na > Li > K > Rb
2. Rb < Na < K < Li
3. Li > Na > K > Rb
4. K < Li < Na < Rb
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The solubility of metal halides depends on their nature, lattice enthalpy and
hydration enthalpy of the individual ions. Amongst fluorides of alkali metals,
the lowest solubility of LiF in water is due to
1. Ionic nature of lithium fluoride
2. High lattice enthalpy
3. High hydration enthalpy for lithium ion.
4. Low ionisation enthalpy of lithium atom
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In the synthesis of sodium carbonate, the recovery of ammonia is done by
treating . The by-product obtained in this process is
1.
2. NaCl
3. NaOH
4.
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By adding gypsum to cement
1. Setting time of cement becomes less.
2. Setting time of cement increases.
3. Colour of cement becomes light.
4. Shining surface is obtained.
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