Assertion : $_{17}^{35} C l$ and $_{17}^{37} C l$ do not differ in their chemical reactions. Reason: Isotopes contain identical numbers of electrons, equal to the atomic number of the atom.

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
Chemical properties of an element depend on the number of electrons present in the outermost shell. In these isotopes number of electrons in their outermost shell is same, So their chemical properties will be same.
The answer is A.

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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: n-Pentane and n-Hexane belong to a homologous series.

REASON: n-Pentane and n-Hexane belong to the same class of hydrocarbons and they differ by a - $C H_{2}$ - group.

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Assertion :3517Cl and 3717Cl do not differ in their chemical reactions. Reason: Isotopes contain identical numbers of electrons, equal to the atomic number of the atom.

Assertion : $_{17}^{35} C l$ and $_{17}^{37} C l$ do not differ in their chemical reactions. Reason: Isotopes contain identical numbers of electrons, equal to the atomic number of the atom.