The valency of I, II, III groups respectively are ……………..
The valency of I, II, III groups respectively are ……………..
A) 1, 2, 3
B) 3, 2,1
C) 4, 5, 6
D) 0,1, 2
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The valency of I, II, III groups respectively are ……………..
A) 1, 2, 3
B) 3, 2,1
C) 4, 5, 6
D) 0,1, 2