Q. No.When treated with conc. HCl, MnO2 yields a gas (X) which further reacts with Ca(OH)2 to generate a white solid (Y). The solid Y reacts with dil. HCl to produce the same gas X. The solid Y is
1. CaO
2. CaCl2
3. Ca(OCl)Cl
4. CaCO3
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The thermal stability of alkaline earth metal carbonates-MgCO3, CaCO3, SrCO3 and BaCO3, follows the order.
1. BaCO3>SrCO3>CaCO3>MgCO3
2. CaCO3>SrCO3>BaCO3>MgCO3
3. MgCO3>CaCO3>SrCO3>BaCO3
4. SrCO3>CaCO3>MgCO3>BaCO3
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CO2 is passed through lime water. Initially the solution turns milky and then becomes clear upon continued bubbling of CO2. The clear solution is due to the formation of
1. CaCO3
2. CaO
3. Ca(OH)2
4. Ca(HCO3)2
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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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