1
IIT-JEE 1979
MCQ (Single Correct Answer)
+1
-0.25
The number of neutrons in dipositive zinc ion with mass number 70 is
A
34
B
36
C
38
D
40
2
IIT-JEE 1979
MCQ (Single Correct Answer)
+2
-0.5
The compound which contains both ionic and covalent bonds is
A
CH4
B
H2
C
KCN
D
KCl
3
IIT-JEE 1979
MCQ (Single Correct Answer)
+2
-0.5
The octet rule is not valid for the molecule
A
CO2
B
H2O
C
O2
D
CO
4
IIT-JEE 1979
Subjective
+3
-0

Account for the following : Limit your answer to two sentences.

"Atomic weights of most of the elements are fractional."

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