Which of the following statements is wrong?

1. Single N—N bond is stronger than a single P—P bond.

2. PH3 can act as a ligand in the formation of coordination compound with transition elements.

3. NO2 is paramagnetic in nature.

4. Covalency of nitrogen in N2O5 is four.

Subtopic:  Group 16 - Preparation, Properties & Uses | Group 15 - Preparation, Properties & Uses |
 76%
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A brown ring is formed in the ring test for NO3- ion. It is due to the formation of-

1. [Fe(H2O)5(NO)]2+
2. FeSO4.NO2 
3. [Fe(H2O)4 (NO)2]2+
4. FeSO4. HNO3

Subtopic:  Group 15 - Preparation, Properties & Uses |
 86%
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Elements of group-15 form compounds in +5 oxidation state. However, bismuth forms only one well-characterized compound in +5 oxidation state. The compound is-

1.  Bi2O5
2.  BiF5
3.  BiCl5
4. Bi2S5

Subtopic:  Group 15 - Preparation, Properties & Uses |
 86%
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On heating ammonium dichromate and barium azide separately we get

1.  N2 in both cases

2.  N2 with ammonium dichromate and NO with barium azide

3.  N2O with ammonium dichromate and N2 with barium azide

4.  N2O with ammonium dichromate and NO2 with barium azide

Subtopic:  Group 15 - Preparation, Properties & Uses |
 79%
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In the preparation of HNO3, we get NO gas by catalytic oxidation of ammonia. The moles of NO produced by the oxidation of two moles of NH3 will be ......... .

1.  2

2.  3

3.  4

4.  6

Subtopic:  Group 15 - Preparation, Properties & Uses |
 73%
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The oxidation state of the central atom in the anion of the compound NaH2PO2 will be-

1. +3

2. +5

3. +1

4. -3

Subtopic:  Group 16 - Preparation, Properties & Uses |
 76%
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Which of the following is not tetrahedral in shape?

1.  NH4+
2.  SiCl4
3.  SF4
4.  SO42-

Subtopic:  Group 16 - Preparation, Properties & Uses |
 77%
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Which of the following are peroxoacids of sulphur?

1.H2SO5  and  H2S2O8
2.H2SO5  and  H2S2O7
3.H2S2O7 and  H2S2O8
4.H2S2O6 and  H2S2O7

Subtopic:  Group 16 - Preparation, Properties & Uses |
 55%
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Hot conc. H2SO4 acts as moderately strong oxidising agent. It oxidises both metals and non-metals. Which of the following element is oxidised by conc. H2SO4 into two gaseous products?

1.  Cu

2.  S

3.  C

4.  Zn

Subtopic:  Group 16 - Preparation, Properties & Uses |
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A black compound of manganese reacts with a halogen acid to give greenish-yellow gas. When an excess of this gas reacts with NH3 an unstable trihalide is formed. In this process, the oxidation state of nitrogen changes from-

1. -3 to +3

2. -3 to 0

3. -3 to +5

4. 0 to -3

Subtopic:  Group 17 - Preparation, Properties & Uses |
 65%
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