The following question consists of two statements one labelled ASSERTION $(A)$ and the another labelled REASON $(R)$ . Select the correct answer to the question from the codes given below:

Assertion: Sulphur exhibits paramagnetic behaviour in vapour state.

Reason: In vapour state sulphur partly exists as $S_{2}$ molecule which has two unpaired electrons in antibonding $π^{*}$ orbitals.

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Important Questions on The p-Block Elements

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Alpha Question Bank for Medical: Chemistry>Chapter 18 - The p-Block Elements>Exercise 3>Q 33

Assertion : Boron forms only covalent compounds.
Reason : Due to small size of boron, the sum of its first three ionisation enthalpies very high.

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Alpha Question Bank for Medical: Chemistry>Chapter 18 - The p-Block Elements>Exercise 3>Q 36

Assertion: Most of the metal halides of group

13^{th}

are dimerised through halogen bridging.
Reason : The metal species completes its octet by accepting electrons from halogen in those halogen bridged molecules.

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Alpha Question Bank for Medical: Chemistry>Chapter 18 - The p-Block Elements>Exercise 3>Q 42

Assertion :

Si - Si

bonds are much weaker than

Si - O

bonds.
Reason : Silicon forms double bonds with itself.

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Alpha Question Bank for Medical: Chemistry>Chapter 18 - The p-Block Elements>Exercise 3>Q 45

Assertion: Chlorine and sulphur dioxide both are bleaching agents.
Reason: The bleaching action of chlorine and sulphur dioxide is performed through the process of oxidation.

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Alpha Question Bank for Medical: Chemistry>Chapter 18 - The p-Block Elements>Exercise 3>Q 46

Assertion: Most of the reactions of fluorine are exothermic.
Reason: Fluorine atom is smaller and forms strong bonds with other elements and has low dissociation energy of the