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 PCl₅ molecule equivalent
4. PCl₅ reacts with organic compounds containing –OH group converting them to chloro derivatives.


 

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.

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.

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

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

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

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

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.

The incorrect statement among the following is-

1. Cl₂ reaction with hot and concentrated NaOH produces NaCl andNaClO₃.
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.