1

### IIT-JEE 1980

The total number of electrons that take part in forming the bond in N2 is
A
2
B
4
C
6
D
10
2

### IIT-JEE 1980

Which of the following compounds are covalent?
A
H2
B
CaO
C
KCl
D
Na2S
3

### IIT-JEE 1980

Element X is strongly electropositive and element Y is strongly electronegative. Both are univalent. The compound formed would be
A
X+Y-
B
X-X+
C
X-Y
D
X $\to$ Y
4

### IIT-JEE 1979

The octet rule is not valid for the molecule
A
CO2
B
H2O
C
O2
D
CO