Question:
Assertion (A): If aluminium atoms replace a few silicon atoms in three
the dimensional network of silicon dioxide, the overall structure
acquires a negative charge.
Reason (R): Aluminium is trivalent while silicon is tetravalent.
(i) Both A and R are correct and R is the correct explanation of A.
(ii) Both A and R are correct but R is not the correct explanation of A.
(iii) Both A and R are not correct
(iv) A is not correct but R is correct.
Solution:
Option (i) Both A and R are correct and R is the correct explanation of A is correct.