A compound soluble in pyridine is:-
1. LiCl
2. CsCl
3. NaCl
4. KCl
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Superoxide is formed on heating with an excess of air by:-
1. Li, Na
2. Mg, Be
3. Na, K
4. K, Rb
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A colourless salt among the following that gives violet colour to Bunsen flame is -
1. Na2CO3
2. K2CO3
3. Cu(OH)2
4. MgCO3
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The incorrect statement among the following is-
1. Lithium is the strongest reducing agent.
2. Density of potassium is more than sodium.
3. Cs are used in devising photoelectric cells.
4. All alkali metals give a blue solution in liquid ammonia.
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An ion that has the largest size among the following is :
1. Li+(aq)
2. Cs+(aq)
3. Li+(g)
4. K+(aq)
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The suspension of slaked lime in water is known as -
1. Limewater.
2. Quicklime.
3. Milk of lime.
4. Aqueous solution of slaked lime.
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The incorrect statement among the following regarding Beryllium is-
1. It is rendered passive by nitric acid.
2. lt forms Be2C
3. It's salts rarely hydrolyze.
4. It's hydride is electron-deficient and polymeric.
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An alkaline earth metal sulphate that has hydration enthalpy higher than the lattice enthalpy is -
1. CaSO4
2. BeSO4
3. BaSO4
4. SrSO4
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Property of the alkaline earth metals that increases with their atomic number is -
1. Solubility of their hydroxides in water.
2. Solubility of their sulphates in water.
3. Ionisation energy.
4. Electronegativity.
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The strongest factor responsible for reducing action of Li metal in an aqueous solution is :
1. Sublimation enthalpy .
2. Ionisation enthalpy.
3. Hydration enthalpy .
4. Electron-gain enthalpy.
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