Assertion (A): $109$ % $H_{2} S O_{4}$ represent a way to express concentration of industrial $H_{2} S O_{4}$ .
Reason (R): It represents that $9$ g $H_{2} O$ reacts with $40$ g $S O_{3}$ to produce $49$ g $H_{2} S O_{4}$ in addition to $100$ g $H_{2} S O_{4}$ .

Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.

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Assertion is correct but Reason is incorrect.

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Assertion is incorrect but Reason is correct.

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.
When a sulfuric acid sample is labelled as $109$ %, it means that $100$ g sulfuric sample require $9$ g water to produced $109$ g sulfuric acid.

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Assertion (A): 109 % H2SO4 represent a way to express concentration of industrial H2SO4.Reason (R): It represents that 9g H2O reacts with 40g SO3 to produce 49g H2SO4 in addition to 100g H2SO4.

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.When a sulfuric acid sample is labelled as 109%, it means that 100 g sulfuric sample require 9 g water to produced 109 g sulfuric acid.

Assertion (A): $109$ % $H_{2} S O_{4}$ represent a way to express concentration of industrial $H_{2} S O_{4}$ .
Reason (R): It represents that $9$ g $H_{2} O$ reacts with $40$ g $S O_{3}$ to produce $49$ g $H_{2} S O_{4}$ in addition to $100$ g $H_{2} S O_{4}$ .

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.
When a sulfuric acid sample is labelled as $109$ %, it means that $100$ g sulfuric sample require $9$ g water to produced $109$ g sulfuric acid.