Valency of carbon is _______ and valency of aluminium is ________ .
A
4,2
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B
3,4
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C
3,1
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D
4,3
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Solution
The correct option is D 4,3 valency is the combining capacity of an atom.
Carbon with atomic number 14 has a valency of 4, Aluminium with atomic number 13 has a valency of 3.