Lithium is the only alkali metal which is not placed in kerosene but is wrapped in paraffin wax, because:

1. it reacts with kerosene

2. it floats to the surface of kerosene because of low density

3. it does not react with air and H2O

4. none of the above

Subtopic:  Physical Properties |
 69%
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When CO2 is bubbled into an aqueous solution of Na2CO3, the following is formed:

1. H2O

2. OH-

3. NaHCO3

4. NaOH

Subtopic:  Chemical Properties |
 85%
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The element which does not dissolve in caustic soda is:

1. silicon

2. aluminium

3. zinc

4. cadmium

Subtopic:  Chemical Properties |
 54%
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The principal products obtained on heating iodine with concentrated caustic soda solution are:

1. NaOI + NaI

2. NaIO3 + Nal

3. NaOI + NaIO3 + NaI

4. NaIO4 + NaI

Subtopic:  Chemical Properties |
 51%
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The formula of washing soda is:

1. Na2CO3

2. Na2CO3.H2O

3. Na2CO3.7H2O

4. Na2CO3.10H2O

Subtopic:  Compounds of Ca and Na -Preparations, Properties & Uses |
 87%
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When sulphur is heated with NaOH(aq) the compounds formed are:

(1) Na2S + H2O

(2) Na2SO3 + H2O

(3) Na2S + Na2S2O3 + H2O

(4) Na2S2O3 + H2O

Subtopic:  Preparations, Properties & Uses of S Block Elements |
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NaOH is prepared by the electrolysis of:

1. aqueous solution of sodium chloride with platinum electrodes

2. molten sodium chloride with graphite anode and iron cathodes

3. sodium carbonate with platinum electrodes

4. sodium carbonate with nickel electrodes

Subtopic:  Preparations, Properties & Uses of S Block Elements |
 67%
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Fusion of AgCl with Na2CO3 gives:

1. Ag2CO3

2. silver carbide

3. Ag

4. Ag2

Subtopic:  Chemical Properties |
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Which of the following acts as reducing agent as well as oxidising agent?

1. Na2O

2. Na2O2

3. NaNO3

4. KNO3

Subtopic:  Chemical Properties |
 70%
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Nitrates of I group (except LiNO3) on heating give:

1. O2

2. N2

3. NO

4. NO2

Subtopic:  Chemical Properties |
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