Which of the following is the correct statement?

1. F2 has higher dissociation energy than Cl2

2. F has higher electron affinity than Cl

3. HF is stronger acid than HCl

4. Boiling point increases down the group in halogens

Subtopic:  Group 17 - Preparation, Properties & Uses |
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Incorrectly matched characteristic is:

1. S8: covalent lattice

2. P4: tetrahedron

3. S52-: zigzag

4. SiO2: Covalent lattice

Subtopic:  Group 16 - Preparation, Properties & Uses |
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Among the following reactions,  N2 is not generated by heating:

1. (NH4)2Cr2O7

2. NH4Cl + NaNO2

3. NH4Cl + CaO

4. Ba(N3)2

Subtopic:  Group 15 - Preparation, Properties & Uses |
 73%
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 An oxyacid among the following that contains both P-H and P-P bonds simultaneously is:

1. H4P2O5

2. H4P2O7

3. H4P2O6

4. None of the above

Subtopic:  Group 15 - Preparation, Properties & Uses |
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Oxidation of nitrogen among the following reactions is indicated by -
1. \(\mathrm{N}_2 \rightarrow 2 \mathrm{NH}_3 \)
2. \(\mathrm{N}_2 \mathrm{O}_4 \rightarrow 2 \mathrm{NO}_2 \)
3. \(\mathrm{NO}_3{ }^{-} \rightarrow \mathrm{N}_2 \mathrm{O}_5 \)
4. \(\mathrm{NO}_2^{-} \rightarrow \mathrm{NO}_3^{-}\)

Subtopic:  Group 15 - Preparation, Properties & Uses |
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B(OH)3 + NaOH   NaBO2 + Na[B(OH)4] +H2O

How can this reaction is made to proceed in forward direction?

1. addition of cis 1,2 diol

2. addition of borax

3. addition of trans 1,2 diol

4. addition of Na2HPO4

Subtopic:  Anomalous Behaviour of B & C |
 51%
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Which of the following has been arranged in order of decreasing bond dissociation energy:

1. P-O>Cl-O>S-O

2. P-O>S-O>Cl-O

3. S-O>Cl-O>P-O

4. Cl-O>S-O>P-O

Subtopic:  Group 17 - Preparation, Properties & Uses | Group 16 - Preparation, Properties & Uses |
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Iodine on reaction with concentrated nitric acid forms:

1. HOI

2. HI

3. HIO3

4. HIO4

Subtopic:  Group 15 - Preparation, Properties & Uses |
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The formation of PH4+ is difficult as compared to NH4+ because

1. Lone pair of phosphorous is optically inert.

2. Lone pair of phosphorous resides in almost pure p - orbital.

3. Lone pair of phosphorous resides at sp3 orbital.

4. Lone pair of phosphorous resides in almost pure s - orbital.

Subtopic:  Group 15 - Preparation, Properties & Uses |
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By heating which of the following, would NO2 be produced?

1. NaNO3

2. AgNO3

3. NH4NO3

4. NH4NO2

Subtopic:  Group 15 - Preparation, Properties & Uses |
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