Q.

Statement I : The oxidation number of boron in BF3 is +3Statement II : Boron cannot form a cation

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a

Both the statements are true

b

Both the statements are false

c

I is false and II is true

d

I is true and II is false

answer is A.

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Detailed Solution

the oxidation state of B in BF3 is +3.→Boron can't form caion ,due to its small size and high sum of first three ionisation energies.Therefore it does not lose its three valency electrons and does not form B+3 cation.
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Statement I : The oxidation number of boron in BF3 is +3Statement II : Boron cannot form a cation