The density of a 2 M aqueous solution of NaOH is 1.28 g/. The molality of the solution is:
[molecular mass of NaOH = 40 ]
1. | 1.20 m | 2. | 1.56 m |
3. | 1.67 m | 4. | 1.32 m |
A bottle of solution contains 70% (w/w) acid. If the density of the solution is 1.54 g , the volume of the solution required to prepare 1 L of 1 N solution is
1. 90mL
2. 45 mL
3. 30 mL
4. 23 mL
The molality of pure water is:
1. 1 m
2. 18 m
3. 55.5 m
4. None of the above
10 g of a silver coin when dissolved completely in
excess of conc. HNO gives 8.5 g of silver nitrate.
The percentage purity of the coin is
1. 25%
2. 54%
3. 67%
4. 100%
Assertion (A): | 1 g O2 and 1 g O3 have an equal number of oxygen atoms. |
Reason (R): | O2 and O3 have different molar masses. |
1. | Both A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | (A) is false but (R) is true. |
The hydrated salt Na2SO4.nH2O, undergoes 55% loss in weight on heating and becomes anhydrous. The value of n will be -
1. 5
2. 3
3. 7
4. 10
At 100 ºC and 1 atm, if the density of liquid water is 1.0 g cm–3 and that of water vapor is 0.0006 g cm-3, then the volume occupied by water molecules in 1 litre of steam at that temperature will be:
1. | 6 cm3 | 2. | 60 cm3 |
3. | 0.6 cm3 | 4. | 0.06 cm3 |
ln, a closed vessel, 50 ml of completely reacts with 200 ml of C2 according to the following equation:
The composition of the gaseous mixture in the system will be:
1. 100 ml
2. 25 ml
3. 75 ml
4. 10 ml
Calculate the mass of required to remove the hardness of litre of water containing 1.62 g of calcium bicarbonate per litre.
1. 5.6*10^-6
2. 5.6*10^5
3. 4.8*10^9
4. 1.2*10^-4
0.5 g of fuming (oleum) is diluted with water. The solution requires 26.7 mL of 0.4 N for complete neutralization. Find the % of free in the sample of oleum. Also report % of oleum solution.
1. 104.68 %
2. 98 %
3. 106.13%
4. 56 %