Assertion (A): R3P = O exists but R3N = O does not (R = alkyl group).
Reason (R): Nitrogen doesn't have d orbitals.

1. (A) is true and (R) is the correct explanation of (A).
2. (A) is true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false

Subtopic:  Group 15 - Preparation, Properties & Uses |
 90%
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Assertion (A)  Nitrogen exists as a diatomic molecule and phosphorus as P4.
Reason (R) Phosphorus is smaller in size, so it can form P4.

 

1. (A) is true and (R) is the correct explanation of (A).
2. (A) is true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false

Subtopic:  Group 15 - Preparation, Properties & Uses |
 68%
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The disproportionation reaction of H3PO3 is as follows:

H3PO3  X + Y

 X and Y in the above reaction are:

1. H3PO2, HPO2  

2. H3PO4, PH3

3. H2PO6, PO3

4. None of the above.

Subtopic:  Group 15 - Preparation, Properties & Uses |
 75%
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Assertion (A): Phosphorous (V) has a tendency to only gain electrons as it is in its highest oxidation state
Reason (R): PCl5 can act as an oxidizing as well as a reducing agent.

 

1. (A) is true and (R) is the correct explanation of (A).
2. (A) is true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false

Subtopic:  Group 15 - Preparation, Properties & Uses |
 57%
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The catalyst that is used in the contact process is:

1. Fe2O3 2. Al2O3
3. V2O5 4. SO3
Subtopic:  Group 16 - Preparation, Properties & Uses |
 92%
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The chemical formula of oleum is - 

1. H2S2O8 2. H2S2O7
3. H3S2O6 4. H2SO5
Subtopic:  Group 16 - Preparation, Properties & Uses |
 90%
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The correct order of bond dissociation energy of halogens F2, Cl2, Br2 and I2 is-

1. F2 < Cl2 < Br2 < I2

2. I2 > Br2 > F2 > Cl2

3. Cl2 > Br2 < F2 > I2

4. I2 < F2 < Br2 < Cl2

Subtopic:  Group 17 - Preparation, Properties & Uses |
 55%
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The correct increasing order of basic strength of hydrides:

1. BiH3 \(\simeq \) SbH3 < AsH3 < PH3 < NH3 
2. BiH3  > NH3  > PH3 > SbH3 > AsH3 
3. SbH3 < AsH3 < PH3 < NH3 < BiH3 
4. AsH3 > NH3 > PH3 > SbH3 > BiH3

Subtopic:  Group 15 - Preparation, Properties & Uses |
 81%
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The bonding present in nitrogen molecules is:
1. \(p\pi-p\pi\)
2. \(p\pi-d\pi\)
3. \(d\pi-d\pi\)
4. Only sigma bond

Subtopic:  Group 15 - Preparation, Properties & Uses |
 93%
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Which of the following is true about reactivity of group 15 elements?

1. Stability of their hydrides increases down the group.

2. Higher oxides are acidic in nature.

3. All elements form pentahalides.

4. They do not react with metals.

Subtopic:  Group 15 - Preparation, Properties & Uses |
 72%
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