Assertion : $_{17}^{35} C l$ and $_{17}^{37} C l$ have the same chemical properties. Reason: Isotopes have the same number of protons and electrons and the same chemical reactions.

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.
$_{17}^{35} C l$ isotope = 17 protons + 18 neutrons
$_{17}^{37} C l$ isotope=17 protons+20 neutrons
75% $_{17}^{35} C l$ and 25% $_{17}^{37} C l$
Average atomic mass=35.5
Isotopes have the same number of protons and electrons, thus they have the same atomic number and the same chemical reactions.
But they have different numbers of neutrons giving them different atomic masses.
So $_{17}^{35} C l$ and $_{17}^{37} C l$ have same chemical properties.

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Assertion :3517Cl and 3717Cl have the same chemical properties. Reason: Isotopes have the same number of protons and electrons and the same chemical reactions.

Assertion : $_{17}^{35} C l$ and $_{17}^{37} C l$ have the same chemical properties. Reason: Isotopes have the same number of protons and electrons and the same chemical reactions.