Q31. Number of elements from the following that CANNOT form compounds with valencies which match with their respective group valencies is $\_\_\_\_$ . B, C, N, S, O, F, P, Al, Si (1) 7 (2) 3 (3) 5 (4) 6
Q31. Number of elements from the following that CANNOT form compounds with valencies which match with their respective group valencies is $\_\_\_\_$ . B, C, N, S, O, F, P, Al, Si\\
(1) 7\\
(2) 3\\
(3) 5\\
(4) 6