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1
IIT-JEE 1979
MCQ (Single Correct Answer)
+2
-0.5
The largest number of molecules is in
A
32 g of water
B
28 g of carbon monoxide
C
46 g of ethyl alcohol
D
54 g of nitrogen pentoxide
2
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
3
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
4
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

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