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  • Assertion: Alkali metals have a silvery appearance. Reason: Alkali metals have high reflectivity due to the presence of a free electron that ca

Assertion: Alkali metals have a silvery appearance.

Reason: Alkali metals have high reflectivity due to the presence of a free electron that can absorb and re-emit light.

Option: 1

Both Assertion (A) and Reason (R) are the true and Reason (R) is a correct explanation of Assertion (A).


Option: 2

Both Assertion (A) and Reason (R) are the true but Reason (R) is not a correct explanation of Assertion (A).


Option: 3

Assertion (A) is true and Reason (R) is false.


Option: 4

Assertion (A) is false and Reason (R) is true.


Answers (1)

 The assertion is true because alkali metals have a high reflectivity due to the presence of a free electron that can absorb and re-emit light. This gives the metals a silvery appearance, as they reflect most of the light that falls on them. The presence of this free electron also makes them good conductors of electricity and heat.

 

Posted by

Ramraj Saini

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