1
AIEEE 2004
+4
-1
6.02 $$\times$$ 1020 molecules of urea are present in 100 ml of its solution. The concentration of urea solution is
(Avogadro constant, NA = 6.02 $$\times$$ 1023 mol-1)
A
0.02 M
B
0.01 M
C
0.001 M
D
0.1 M
2
AIEEE 2004
+4
-1
To neutralise completely 20 mL of 0.1 M aqueous solution of phosphorous acid (H3PO3), the volume of 0.1 M aqueous KOH solution required is
A
40 mL
B
20 mL
C
10 mL
D
60 mL
3
AIEEE 2004
+4
-1
The ammonia evolved from the treatment of 0.30 g of an organic compound for the estimation of nitrogen was passed in 100 mL of 0.1 M sulphuric acid. The excess of acid required 20 mL of 0.5 M sodium hydroxide solution for complete neutralization. The organic compound is
A
urea
B
benzamide
C
acetamide
D
thiourea
4
AIEEE 2003
+4
-1
What volume of hydrogen gas at 273 K and 1 atm pressure will be consumed in obtaining 21.6 g of elemental boron (atomic mass = 10.8) from the reduction of boron trichloride by hydrogen?
A
67.2 L
B
44.8 L
C
22.4 L
D
89.6 L
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