Assertion (A): If aluminium atom s replace a few silicon atoms in three dimensional network of silicon dioxide, the overall structure acquriesa negative charge. Reason(R): Aluminium is trivalent while silicon is tetravalent.

Assertion (A): If aluminium atom s replace a few silicon atoms in thre

1.	Assertion (A): If aluminium atom s replace a few silicon atoms in three dimensional network of silicon dioxide, the overall structure acquriesa negative charge. Reason(R): Aluminium is trivalent while silicon is tetravalent.
Answer» Both A and R are correct and R is the correct explanation of A Both A and R are correct but R is not the correct explanation of A Both A and R are not correct A is not correct but R is correct Solution :Assertionis not correct but reason is correct. Aluminium is trivalent whereas silicon is tetravalent. If aluminium ATOM replaces a few silicon ATOMS in three DIMENSIONAL network of silicon dioxide, the overall structure acquires neutrally.