Assertion :Sound waves do not travel through vacuum Reason: Sound waves are mechanical waves, which require a medium for their propagation

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
We know that sound can not travel through vacuum because there are no matter or particles for the transmit of vibration energy from one place to another place. So the sound requires a medium to propagate.

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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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