An element belongs to group 15 and 3rd period of the periodic table. Its electronic configuration would be:
1. \(\mathrm{1 s^2 2 s^2 2 p^4} \)
2. \(\mathrm{1 s^2 2 s^2 2 p^3} \)
3. \(\mathrm{1 s^2 2 s^2 2 p^6 3 s^2 3 p^2} \)
4. \(\mathrm{1 s^2 2 s^2 2 p^6 3 s^2 3 p^3}\)

Subtopic:  Group 15 - Preparation, Properties & Uses |
 82%
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A solid (A) reacts with strong aqueous NaOH, liberating a foul smelling gas (B), which spontaneously burns in the air, giving smoky rings. A and B are, respectively:

1. P(red) and PH3 

2. P(white) and PH3

3. S8 and H2S

4. P(white) and H2S

Subtopic:  Group 15 - Preparation, Properties & Uses |
 78%
From NCERT
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Which of the following gases is the easiest to liquefy?

1. Ar 2. Ne
3. Xe 4. Kr
Subtopic:  Group 18 - Preparation, Properties & Uses |
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Which of the following compounds is not an acidic salt?

1. NaH2PO2

2. NaH2PO3

3. Na2H2S2O7

4. NaH2PO4

Subtopic:  Group 15 - Preparation, Properties & Uses |
 51%
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Hydrogen peroxide can be generated by the hydrolysis of

1. HNO3

2. H2P2O

3. H2S2O8

4. H2S2O6

Subtopic:  Group 16 - Preparation, Properties & Uses |
 77%
From NCERT
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Which of the following statements is false? 

1. Xe is the most reactive among the rare gases.
2. He is an inert gas.
3. Radon is obtained from the decay of radium.
4. The most abundant rare gas found in the atmosphere is He.

Subtopic:  Group 18 - Preparation, Properties & Uses |
 74%
From NCERT
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The strongest reducing agent is:

1. H4P2O7

2. H3PO3

3. H3PO2

4. H3PO4

Subtopic:  Group 15 - Preparation, Properties & Uses |
 70%
From NCERT
NEET - 2019
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A compound among the following that has an -O-O- linkage is:

1. H2SO4, sulphuric acid

2. H2S2O8, peroxodisulphuric acid

3. H2S2O7, pyrosulphuric acid

4. H2SO3, sulphurous acid

Subtopic:  Group 16 - Preparation, Properties & Uses |
 87%
From NCERT
NEET - 2020
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The respective oxidation states of P in H4P2O5, H4P2O6, and H4P2O7 are: 

1. +3, +5, and +4 2. +5, +3, and +4
3. +5, +4, and +3 4. +3, +4, and +5
Subtopic:  Group 15 - Preparation, Properties & Uses |
 86%
From NCERT
AIPMT - 2010
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A balanced chemical equation for the reaction showing catalytic oxidation of NH3 by atmospheric oxygen is:

1. 4NH3 + \(\underset{\text{From air}}{5O_2} \)   \(\xrightarrow[\text{500 K; 9 bar}]{\text{Pt / Rh gauge catalyst}}\)   4NO + 6H2O
2. 3NH4 + \(\underset{\text{From air}}{5O_2} \)  \(\xrightarrow[\text{500 K; 9 bar}]{\text{Pt / Rh gauge catalyst}}\)  3NO + 6H2O
3. 4NH3 + \(\underset{\text{From air}}{5O_2} \)  \(\xrightarrow[\text{cold}]{\text{no catalyst}}\)  4NO + 6H2O
4. 3NH4 + \(\underset{\text{From air}}{5O_2} \)  \(\xrightarrow[\text{cold}]{\text{no catalyst}}\)  3NO + 6H2O
Subtopic:  Group 15 - Preparation, Properties & Uses |
 84%
From NCERT
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