Assertion : $A l$ forms ${[A l F_{6}]}^{3 -}$ but $B$ does not form ${[{B F}_{6}]}^{3 -}$ Reason: $B$ does not react with fluorine.

Read the above assertion and reason and choose the correct option regarding it.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
$A l$ forms ${[A l F_{6}]}^{3 -}$ but $B$ does not form ${[{B F}_{6}]}^{3 -}$ .

$B$ lacks d orbitals. Hence, it cannot have more than 8 electrons in its valence shell. Hence, it cannot form ${[{B F}_{6}]}^{3 -}$ .

$B$ reacts with fluorine to form $[{B F}_{3}]$ .

Assertion is correct but Reason is incorrect.

The correct option is $C$ .

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Similar questions

Assertion

Lithium sulphate does not form alums.

Reason

$L i^{+}$ is too small to form a stable lattice required for double-salt/alum formation.

Q. Assertion: The impurities such as

{SiO}_{2}

present in iron ore is removed by

{CaCO}_{3}

.

Reason:

CaO

formed by decomposition of

{CaCO}_{3}

reacts with

{SiO}_{2}

to form slag.

Assertion – The non-fusible impurities present in iron ore are removed by $C a C O_{3}$ .

Reason: $C a C O_{3}$ which decomposes into $C a O$ and $C O_{2}$ . The $C a O$ formed reacts with $S i O_{2}$ to remove silica

Assertion (A) Order of the reaction can be zero or fractional.

Reason (R) We cannot determine order from balanced chemical equation.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

Assertion (A) Order and molecularity are same.

Reason (R) Order is determined experimentally and molecularity is the sum of the stoichimetric coeffcient of rate determining elementary step.

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Assertion :Al forms [AlF6]3− but B does not form [BF6]3− Reason: B does not react with fluorine.Read the above assertion and reason and choose the correct option regarding it.

Assertion : $A l$ forms ${[A l F_{6}]}^{3 -}$ but $B$ does not form ${[{B F}_{6}]}^{3 -}$ Reason: $B$ does not react with fluorine.

Read the above assertion and reason and choose the correct option regarding it.