The incorrect statement about PCl5 among the following is-

1. The hybridization of P in PCl5 is sp3d.
2. PCl5 decomposed and give PCl3 and Cl2.
3. All the five bonds in PCl
5 molecule equivalent
4.
PCl5 reacts with organic compounds containing –OH group converting them to chloro derivatives.


 

Subtopic:  Group 15 - Preparation, Properties & Uses |
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Assertion: H3PO2 is a reducing agent. 
Reason: All oxyacids of phosphorus that have P-H bonds act as strong reducing agents. H3PO2 has two P-H bonds hence, it acts as a strong reducing agent.

1. Both assertion and reason are true and reason is the correct explanation of the assertion.

2. Both assertion and reason are true but reason is not the correct explanation of the assertion.

3. Assertion is true but reason is false.

4. Assertion is false but reason is true.

Subtopic:  Group 15 - Preparation, Properties & Uses |
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Assertion(A): Elements of Group 16 generally show lower value of first ionisation enthalpy compared to the corresponding periods of group 15.

Reason(R): Elements of Group 16 is more electronegative than elements of Group 15.

1. Both assertion and reason are true, and reason is the correct explanation of the assertion.

2. Both assertion and reason are true, but reason is not the correct explanation of the assertion.

3. Assertion is true but reason is false.

4. Assertion is false but reason is true.

Subtopic:  Group 15 - Preparation, Properties & Uses |
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Assertion(A): H2S is less acidic than H2Te.
Reason(R):
The bond (E–H) dissociation enthalpy decreases down the group in Group 16 hydrides.

The correct option is-

1. Both A and R are true and R is the correct explanation of A

2. Both A and R are true and R is not the correct explanation of A

3. A is true but R is false

4. A is false but R is true

Subtopic:  Group 16 - Preparation, Properties & Uses |
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Assertion(A): Sulphur shows paramagnetic behaviour.
Reason(R): S2 does not contain unpaired electron.

The correct option is-

1. Both A and R are true and R is the correct explanation of A

2. Both A and R are true and R is not the correct explanation of A

3. A is true but R is false

4. A is false but R is true

Subtopic:  Group 16 - Preparation, Properties & Uses |
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Consider the following reaction.

CaF2 + H2SO4  C + D

SO3 + H2O    B      


The products B, C and D respectively

1. B = H2SO3; C= CaSO4; D =HF
2. B = H2SO4; C= CaSO4; D =HOF
3. B = H2SO4; C= CaSO4; D =HF
4. B = H2SO3; C= CaSO4; D =HOF
Subtopic:  Group 16 - Preparation, Properties & Uses |
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Halogens have maximum negative electron gain enthalpy in the respective periods of the periodic table because-

1. It has smallest size and high effective nuclear charge
2. It has the largest size in in the respective periods
3. It is a strong reducing agent
4. None of the above

Subtopic:  Group 17 - Preparation, Properties & Uses |
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Assertion(A): Although electron gain enthalpy of fluorine is less negative as compared to chlorine, fluorine is a stronger oxidising agent than chlorine.

Reason(R): F2 has low enthalpy of dissociation and F has high hydration enthalpy

The correct option is-

1. Both A and R are true and R is the correct explanation of A

2. Both A and R are true and R is not the correct explanation of A

3. A is true but R is false

4. A is false but R is true

Subtopic:  Group 17 - Preparation, Properties & Uses |
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Assertion(A): Fluorine exhibits only –1 oxidation state whereas other halogens exhibit + 1, + 3, + 5 and + 7 oxidation states.
Reason(R): Other halogens have 
d orbitals and therefore, can expand their octets and show +1, +3, +5 and +7 oxidation states also.

1. Both assertion and reason are true and reason is the correct explanation of the assertion.

2. Both assertion and reason are true but reason is not the correct explanation of the assertion.

3. Assertion is true but reason is false.

4. Assertion is false but reason is true.

Subtopic:  Group 17 - Preparation, Properties & Uses |
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The incorrect statement among the following is-

1. Cl2 reaction with hot and concentrated NaOH produces NaCl andNaClO
3.
2.
Cl2 reaction with hot and concentrated NaOH produces NaCl and NaOCl.
3.
It is an example of disproportionation reaction.
4.  Chlorine from zero oxidation state is changed to –1 and +5 oxidation states.

Subtopic:  Group 17 - Preparation, Properties & Uses |
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