Assertion (A): If aluminum atoms replace a few silicon atoms in three dimensional network of silicon dioxide, the overall structure acquires a negative charge. Reason (R) : Aluminum is trivalent while silicon is tetravalent.

Assertion (A): If aluminum atoms replace a few silicon atoms in three

1.	Assertion (A): If aluminum atoms replace a few silicon atoms in three dimensional network of silicon dioxide, the overall structure acquires a negative charge. Reason (R) : Aluminum is trivalent while silicon is tetravalent.
Answer» Both Assertionand Reasonare correct and REASON is the correct EXPLANATION of Assertion. Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion. Both Assertion and Reason are not correct Assertion is not correct but Reason is correct Solution :Al is TRIVALENT and Si is tetravalent and Reason is correct. Here the silicon is doped with group-13 elements.