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This section contains assertion and reason type questions. Each question has 4 choice (1), (2),(3), and (4), out of which only one is correct. Assertion (A) Carbon is tetravalent and forms covalent bond. Reason ( R) Tetravalency can be explained in the terms of its electronic configuration and hybridisation of s- and p – orbitals.
Assertion : Carbon atom is tetravalent though it has two unpaired electrons. Reason : Carbon has unique ability to form p pi - p pi multiple bonds with itself like C = C, C -= C
Assertion (A): If aluminium atom s replace a few silicon atoms in three dimensional network of silicon dioxide, the overall structure acquries a negative charge. Reason(R): Aluminium is trivalent while silicon is tetravalent.
