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Heterolytic Cleavage

Assertion :Bo...

Question

Assertion :Bond dissociation energy of N-F bond in $N F_{3}$ molecule is lower than that of in $N C l_{3}$ molecule. Reason: Interelectronic repulsion exists between small size N and F atoms in N-F bond of $N F_{3}$ molecule.

A

If assertion is true but Reason is false

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B

If assertion is false but Reason is true

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C

If both Assertion and Reason are true but Reason is correct explanation for Assertion.

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D

If both Assertion and Reason are true but Reason is not the correct explanation for Assertion.

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Solution

The correct option is B If assertion is false but Reason is true
The assertion is false but the reason is true.

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Similar questions

Q. Read the assertion and reason carefully to mark the correct option out of the options given below:
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.
(c) If assertion is true but reason is false.
(d) If assertion is false but reason is true.
Assertion: Fluorine is stronger oxidizing agent than chlorine
Reason: High F-F bond dissociation enthalpy and low hydration enthalpy of F^-.

C O_{2}

is a resonance stabilized molecule.
Reason: The bond length of

C - O

C O_{2}

is in between the lengths of a single and a double bond.

Q. Read the assertion and reason carefully to mark the correct option out of the options given below:
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.
(c) If assertion is true but reason is false.
(d) If assertion and reason both are false.

Assertion : HOF bond angle is greater than HOCl bond angle.
Reason : Oxygen is more electronegative than halogens

Q. Read the assertion and reason carefully to mark the correct option out of the options given below:

(a)If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b)If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c)If assertion is true but reason is false.

(d)If assertion is false but reason is true.
Assertion: Ionisation enthalpies for early actinoids are lower than that for early lanthanoids.
Reason: 5f electrons more effectively shielded from the nuclear charge than the 4f electrons
of the corresponding lanthanoids.

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