Alkali metals are characterised by:

1. Good conductors of heat and electricity.

2. High melting points.

3. Low oxidation potentials.

4. High ionisation potentials.

Subtopic:  Physical Properties |
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Excess of dilute sodium hydroxide solution is gradually added with shaking to an aqueous solution of zinc sulphate. What would you observe?

1. A light blue precipitate is first formed which finally dissolves to give a deep blue solution

2. A white precipitate appears which dissolves to give a colourless solution.

3. A white precipitation is formed which does not dissolve 

4. No change takes place and the solution remains clear

Subtopic:  Chemical Properties |
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Which has lowest thermal stability?

1. Li2CO3

2. Na2CO3

3. K2CO3

4. Rb2CO3

Subtopic:  Chemical Properties |
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An alkali metal that reacts with nitrogen to form nitride is -

1. Li

2. Na

3. Cs

4. None of the above

Subtopic:  Chemical Properties |
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Caustic soda is:

1. Efflorescent

2. Deliquescent

3. Hygroscopic

4. Oxidant

Subtopic:  Preparations, Properties & Uses of S Block Elements |
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The most basic oxide among the following is:

1. Na2O

2. BaO

3. As2O3

4. Al2O3

Subtopic:  Chemical Properties |
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Pearl ash and caustic potash are chemically:

1. K2CO3 and KOH

2. KOH and K2CO3

3. Na2CO3 and KOH

4. Na2CO3 and NaOH

Subtopic:  Preparations, Properties & Uses of S Block Elements |
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The most dangerous method of precipitating hydrogen would be by the action of HCl on:

1. Zn

2. Fe

3. K

4. Al

Subtopic:  Chemical Properties |
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Which is industrially prepared by the electrolysis of aqueous NaCl?

1. Na2CO3

2. NaHCO3

3. NaOH 

4. NaOCl

Subtopic:  Chemical Properties |
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The products of the electrolysis of aqueous solution of common salt are:

1. Na + Cl2

2. H2 + O2

3. NaOH + H2 + Cl2

4. NaOH + Cl2 + O2

Subtopic:  Physical Properties | Preparations, Properties & Uses of S Block Elements |
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