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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Indian saltpetre is:

1. KNO3

2. NaNO3

3. NaCl

4. Na2CO3

Subtopic:  Preparations, Properties & Uses of S Block Elements |
 61%
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Microcosmic salt has the formula:

1. Na2HPO4.2H2O

2. (NH4)2HPO4.2H2O

3. Na(NH4)HPO4.4H2O

4. none of these

Subtopic:  Physical Properties |
 53%
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The alkali metal which acts as a nutrient for plants is:

1. Na

2. K

3. Li

4. Rb

Subtopic:  Preparations, Properties & Uses of S Block Elements |
 83%
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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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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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