1
JEE Main 2015 (Offline)
MCQ (Single Correct Answer)
+4
-1
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The molecular formula of a commercial resin used for exchanging ions in water softening is C8H7SO3Na (Mol. Wt. 206). What would be the maximum uptake of Ca2+ ions by the resin when expressed in mole per gram resin?
A
2/309
B
1/412
C
1/103
D
1/206
2
JEE Main 2014 (Offline)
MCQ (Single Correct Answer)
+4
-1
The ratio of masses of oxygen and nitrogen in a particular gaseous mixture is 1 : 4. The ratio of number of their molecule is:
A
1: 8
B
3 : 16
C
1 : 4
D
7 : 32
3
JEE Main 2013 (Offline)
MCQ (Single Correct Answer)
+4
-1
A gaseous hydrocarbon gives upon combustion 0.72 g of water and 3.08 g of CO2. The empirical formula of the hydrocarbon is
A
C2H4
B
C3H4
C
C6H5
D
C7H8
4
JEE Main 2013 (Offline)
MCQ (Single Correct Answer)
+4
-1
Experimentally it was found that a metal oxide has formula M0.98O. Metal M, present as M2+ and M3+ in its oxide. Fraction of the metal which exists as M3+ would be
A
7.01%
B
4.08%
C
6.05%
D
5.08%
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