Oxygen exists as gas and sulphur exists as a solid because:
1. Oxygen is less electronegative than sulphur.

2. Sulphur is smaller than oxygen molecule.

3. Sulphur has a tendency to form pπ-pπ bonds.

4. Oxygen has a tendency to form pπ-pπ bonds.

Subtopic:  Group 16 - Preparation, Properties & Uses |
 76%
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The products formed by the reaction of F2 and Cl2 with water respectively are:

1. HF , HCl

2. H2F2 , HOCl

3. HF, HClO3

4. H2F2, HClO4

Subtopic:  Group 17 - Preparation, Properties & Uses |
 51%
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NaCl when heated with sulphuric acid in the presence of MnO2, gives:

1. MnO

2. MnCl2

3. Cl2

4. Both (2) and (3)

Subtopic:  Group 17 - Preparation, Properties & Uses |
 79%
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Among the following statements, the correct one(s) is/are:  
1. Neon gas is filled in discharge tubes with characteristic colours.
2. Neon gas is used in beacon lights.
3. Argon along with nitrogen is used in gas-filled electric lamps.
4. All of the above.
Subtopic:  Group 18 - Preparation, Properties & Uses |
 92%
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The correct statement(s) among the given options is/are:

1. NO2 has more resonating structures as compared to N2O5
2. In the resonating structure of  NO2 molecules positive charge is on the oxygen atom.
3. NOhas fewer resonating structures than N2O5
4. Both (1) and (2) 

Subtopic:  Group 15 - Preparation, Properties & Uses |
 54%
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The main product(s) formed in the given reaction is/are:

NH4Cl(aq)+NaNO2(aq)....+H2O(l)+NaCl(aq)

1. NH3
2. N2
3. N2H4
4. Both (1)and(3)

Subtopic:  Group 15 - Preparation, Properties & Uses |
 65%
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The correct statement(s) regarding group 15 elements is(are):

1. The stability of +5 oxidation state decreases down a group.
2. The stability of +3 oxidation state decreases down the group.
3. First ionization decreases on moving down a group.
4. Both (1) and (3)

Subtopic:  Group 15 - Preparation, Properties & Uses |
 85%
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A neutral molecule that is isoelectronic with ClO- is -

1. ClF which is a Lewis base

2. ClF which is a Lewis acid

3. HCl which is a Lewis base

4. HCl which is a Lewis acid

 

Subtopic:  Group 17 - Preparation, Properties & Uses |
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 4HCl + O→  X + 2H2O

Cl2 + H2O → HCl  + Y ;

X and Y in the above reaction are respectively:

1.  Cl2 , HOCl

2. HOCl ,Cl2

3. HClO3, HOCl

4. HOCl, HClO4

Subtopic:  Group 17 - Preparation, Properties & Uses |
 74%
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Halogens are colored because -

1. They absorb radiations in the U.V region

2. They absorb radiations in the visible region

3. They absorb radiations in the infrared region

4. They absorb radiations in the radiowaves region

Subtopic:  Group 17 - Preparation, Properties & Uses |
 82%
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