1
IIT-JEE 2009 Paper 1 Offline
MCQ (More than One Correct Answer)
+4
-2
The compound(s) formed upon combustion of sodium metal in excess air is (are)
A
Na2O2
B
Na2O
C
NaO2
D
NaOH
2
IIT-JEE 2009 Paper 1 Offline
MCQ (Single Correct Answer)
+1
-0.25
Given that the abundances of isotopes 54Fe, 56Fe and 57Fe are 5%, 90% and 5%, respectively, the atomic mass of Fe is :
A
55.85
B
55.95
C
55.75
D
56.05
3
IIT-JEE 2009 Paper 1 Offline
MCQ (Single Correct Answer)
+3
-1

The term that corrects for the attractive forces present in a real gas in the van der Waals equation is

A
$$nb$$
B
$${{a{n^2}} \over {{V^2}}}$$
C
$$ - {{a{n^2}} \over {{V^2}}}$$
D
$$ - nb$$
4
IIT-JEE 2009 Paper 1 Offline
MCQ (Single Correct Answer)
+3
-1

Among the electrolytes Na$$_2$$SO$$_4$$, CaCl$$_2$$, Al$$_2$$(SO$$_4$$)$$_3$$ and NH$$_4$$Cl, the most effective coagulating agent for Sb$$_2$$S$$_3$$ sol is

A
Na$$_2$$SO$$_4$$
B
CaCl$$_2$$
C
Al$$_2$$(SO$$_4$$)$$_3$$
D
NH$$_4$$Cl
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