Concentrated nitric acid is 70% HNO₃. The amount of concentrated nitric acid solution that should be used to prepare 250 mL of 2.0 M HNO₃ would be:

1. 90.0 g conc. HNO₃
2. 70.0 g conc. HNO₃
3. 54.0 g conc. HNO₃
4. 45.0 g conc. HNO₃

The mole fraction of the solute in a 1.00 molal aqueous solution is: 

The molality of a 15% (w/vol.) solution of H₂SO₄ of density 1.1g/cm³ is:

1. 1.2 mol/kg

2. 1.4 mol/kg

3. 1.8 mol/kg

4. 1.6 mol/kg

Which mode of expressing concentration is independent of temperature?

1. Molality

2. Percent by mass

3. Mole fraction

4. All of the above 

A partially dried clay mineral contains 8% water. The original sample contained 12% water and 45% silica. The percentage of silica  in the partially dried sample is nearly:

Equal volumes of 0.1 M AgNO₃ and 0.2 M NaCl are mixed. The concentration of N${\mathrm{O}}_3^{-}$ ions in the mixture will be:

The molality of 1M solution of NaCl ( specific gravity 1.0585 g/mL ) is:

1. 1.0585

2. 1.0

3. 0.10

4. 0.0585

Calculate the total molarity of all the ions present in a solution containing 0.1 M of CuSO₄ and 0.1 M of Al₂(SO₄)₃.

1. 0.2M

2. 0.7M

3. 0.8M

4. 1.2M

A 0.1097 gm sample of As₂O₃ require 26.10 ml of KMnO₄ solution for its titration. The molarity of KMnO₄ solution is

1. 0.02

2. 0.04

3. 0.018

4. 0.3

The molality of a 20% (by mass) CaCO₃ solution is : 
(Given: Density of solution is 1.2 gm/ml)