Assertion: Silicon forms stable hydrides, whereas boron does not.
Reason: Boron has a lower electronegativity than silicon.
Both assertion and reason are true, and the reason is the correct explanation of the assertion.
Both assertion and reason are true, but the reason is not the correct explanation of the assertion.
The assertion is true, but the reason is false.
The assertion is false, but the reason is true.
The Assertion is true because boron does not form stable hydrides, whereas silicon forms stable hydrides due to their different electronegativities. The Reasoning is also true because boron has a lower electronegativity than silicon, making it difficult for it to attract electrons from hydrogen and form stable hydrides, whereas silicon has a higher electronegativity than boron, which allows it to form stable hydrides. Hence option A is the correct answer.
Option(2) Both assertion and reason are true and the reason explains assertion correctly. Hence option 2 is incorrect.
Option(3) Both assertion and reason are true. Hence option 3 is incorrect.
Option(4) Both assertion and reason are true. Hence option 4 is incorrect.