1
JEE Main 2014 (Offline)
MCQ (Single Correct Answer)
+4
-1
For the estimation of nitrogen, 1.4 g of organic compound was digested by Kjeldahl method and the evolved ammonia was absorbed in 60 mL of M/10 sulphuric acid. The unreacted acid required 20 ml of M/10 sodium hydroxide for complete neutralization. The percentage of nitrogen in the compound is:
A
3%
B
5%
C
6%
D
10%
2
JEE Main 2014 (Offline)
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
CsCl crystallises in body centred cubic lattice. If ‘a’ is its edge length then which of the following expressions is correct?
A
$${r_{C{s^ + }}} + {r_{C{l^ - }}} = {{\sqrt 3 } \over 2}a$$
B
$${r_{C{s^ + }}} + {r_{C{l^ - }}} = {3 \over 2}a$$
C
$${r_{C{s^ + }}} + {r_{C{l^ - }}} = \sqrt 3 a$$
D
$${r_{C{s^ + }}} + {r_{C{l^ - }}} = 3a$$
3
JEE Main 2014 (Offline)
MCQ (Single Correct Answer)
+4
-1
Consider separate solutions of 0.500 M C2H5OH(aq), 0.100 M Mg3(PO4)2(aq), 0.250 M KBr(aq) and 0.125 M Na3PO4(aq) at 25oC. Which statement is true about these solutions, assuming all salts to be strong electrolytes?
A
0.125 M Na3PO4(aq) has the highest osmotic pressure.
B
0.500 M C2H5OH(aq) has the highest osmotic pressure
C
They all have the same osmotic pressure
D
0.100 M Mg3(PO4)2(aq) has the highest osmotic pressure.
4
JEE Main 2014 (Offline)
MCQ (Single Correct Answer)
+4
-1
Resistance of 0.2 M solution of an electrolyte is 50 $$\Omega$$. The specific conductance of the solution is 1.4 S m-1. The resistance of 0.5 M solution of the same electrolyte is 280 $$\Omega$$. The molar conductivity of 0.5 M solution of the electrolyte in S m2 mol-1 is :
A
5 × 103
B
5 × 102
C
5 × 10-4
D
5 × 10-3
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