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 |
 64%
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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 |
 70%
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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 |
 73%
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Sodium cannot be extracted by the electrolysis of brine solution because:

1. sodium leberated reacts with water to produce NaOH+H2

2. sodium being more electropositive than hydrogen, H2 is liberated at cathod and not sodium

3. electrolysis cannot take place with brine solution

4. none of the above

Subtopic:  Chemical Properties |
 62%
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KO2 is used in oxygen cylinder in space air craft and submarines because it:

1. absorbs CO2 and increase O2 content

2. eliminate moisture

3. absorbs CO2

4. produces O2

Subtopic:  Physical Properties | Chemical Properties |
 68%
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Tin dissolves in boiling caustic soda solution because of the formation of soluble:

1. Sn(OH)2

2. Sn(OH)4

3. Na2SnO3

4. none of these

Subtopic:  Preparations, Properties & Uses of S Block Elements |
 51%
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Potash alum is used in purification of water because:

1. it kills the micro-organisms

2. it precipitates the colloidal matter

3. it removes the hardness of water

4. it catalyses the removal of impurities

Subtopic:  Chemical Properties |
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The pair of compounds which cannot exist together in solution is:

1. NaHCO3 and NaOH

2. Na2CO3 and NaHCO3

3. Na2CO3 and NaOH

4. NaHCO3 and NaCl

Subtopic:  Chemical Properties |
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Which one is the highest melting point halide?

1. NaCl

2. NaBr

3. NaF

4. NaI

Subtopic:  Physical Properties | Preparations, Properties & Uses of S Block Elements |
 66%
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LiAlH4 is obtained by reacting an excess of ...... with an etheral solution of AlCl3.

1. LiCl

2. LiH

3. Li

4. LiOH

Subtopic:  Chemical Properties |
 61%
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