Assertion :Nuclide $_{13} {A l}^{30}$ is less stable than $_{20} {C a}^{40}$ . Reason: Nuclides having odd number of protons and neutrons are generally unstable.

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
$_{20}^{40} C a$ is stable non radioactive nucleus thus it is more stable than $_{12}^{30} A l$
Nucleids with odd number of protons and neutrons are quiet unstable. It is why $_{12}^{30} A l$ is unstable.

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Assertion

Lithium sulphate does not form alums.

Reason

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

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