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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The byproduct of the Solvay process is:

1. CO2

2. NH3

3. CaCl2

4. CaCO3

Subtopic:  Compounds of Ca and Na -Preparations, Properties & Uses |
 55%
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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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Manufacture of NaOH is done by:

1. Castner - Kellner process

2. Solvay process

3. Brine process

4. Mond's process

Subtopic:  Preparations, Properties & Uses of S Block Elements |
 75%
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Sodium does not form Na2+ ,because:

1. Sodium contains only one electron in its outermost shell

2. First ionization potential is small and the difference in first and second ionization potential is very large.

3. Radius of Na+2 is much smaller than of Na+

4. None of the above.

Subtopic:  Physical Properties |
 64%
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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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