Q. No.3.24 g of Hg(NO3)2 (molar mass = 324) dissolved in 1000 g of water constitutes a solution having a freezing point of –0.0558°C while 21.68 g of HgCl2 (molar mass = 271) in 2000 g of water constitutes a solution with a freezing point of –0.0744°C. The Kf for water is 1.86 . About the state of ionization of these two solids in water it can be inferred that:
(1) Hg(NO3)2 and HgCl2 both are completely ionized
(2) Hg(NO3)2 is fully ionized but HgCl2 is fully unionized
(3) Hg(NO3)2 and HgCl2 both are completely unionized
(4) Hg(NO3)2 is fully unionized but HgCl2 is fully ionized
15 g of methyl alcohol is dissolved in 35 g of water. The weight percentage of methyl alcohol in solution is
1. 30%
2. 50%
3. 70%
4. 75%
The seawater sample contains 5.8 × 10–3 g of dissolved oxygen per kilogram of the sample. The concentration of oxygen in parts per million is-
1. 5.8 ppm
2. 58.5 ppm
3. 0.58 ppm
4. 0.05 ppm
A 500 gm toothpaste sample has 0.2 g fluoride concentration. The concentration of fluoride ions in terms of ppm level is
(1) 250 ppm
(2) 200 ppm
(3) 400 ppm
(4) 1000 ppm
Normality of a solution containing 9.8 g of H2SO4 in 250 cm3 of the solution is
[MP PMT 1995, 2003; CMC Vellore 1991; JIPMER 1991]
(1) 0.8 N
(2) 1 N
(3) 0.08 N
(4) 1.8 N
50 ml of of 12 N HCl and 40 ml of were mixed together and the volume of the mixture was made 1000 ml by adding water. The normality of the resulting solution will be
(1) 1 N
(2) 2 N
(3) 3 N
(4) 4 N
100 ml of 0.3 N HCl is mixed with 200 ml of 0.6 N H2SO4. The final normality of the resulting solution will be
(1) 0.1 N
(2) 0.2 N
(3) 0.3 N
(4) 0.5 N
An aqueous solution of 6.3 g oxalic acid dihydrate is made up to 250 ml. The volume of 0.1 N NaOH required to completely neutralize 10 ml of this solution is [IIT 2001; CPMT 1986]
(1) 40 ml
(2) 20 ml
(3) 10 ml
(4) 4 ml
10.6 g of Na2CO3 was exactly neutralised by 100 ml of H2SO4 solution. Its normality is
(1) 1 N
(2) 2 N
(3) 1.5 N
(4) 0.5 N
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