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- #Class 11
- #s- Block Elements ( Alkali and Alkaline earth metals )
- #National Eligilibility Cum Entrance Test
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Assertion: Alkali metals are soft and can be easily cut with a knife.
Reason: Alkali metals have weak metallic bonds and low melting points, making them soft and malleable.
Both Assertion (A) and Reason (R) are the true and Reason (R) is a correct explanation of Assertion (A).
Both Assertion (A) and Reason (R) are the true but Reason (R) is not a correct explanation of Assertion (A).
Assertion (A) is true and Reason (R) is false.
Assertion (A) is false and Reason (R) is true.
Answers (1)
The assertion is true because alkali metals have weak metallic bonds due to the presence of only one valence electron in their outermost shell. This makes them soft and malleable, as the atoms can easily slide past each other when subjected to stress. Additionally, they have low melting points, which means that they can be easily cut with a knife.
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