Assertion : The molality of the solution does not change with change in tempe-rature.

Reason : The molality is expressed in units of moles per 1000 g of solvent.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

What is the molarity of H₂SO₄ solution that has a density of 1.84 g/cc at 35$°$C and contains 98% by weight?

• 4.18 M

• 8.14 M

• 18.4 M

• 18 M

2.5 g of the carbonate of a metal was treated with 100 mL of 1N H₂SO₄. After the completion of the reaction, the solution was boiled off to expel CO₂ and was then titrated against 1N NaOH solution. The volume of alkali that would be consumed, if the equivalent weight of the metal is 20

• 50

• 25

• 75

• 100

Percentage of Se (at. mass= 78.4) in peroxidase anhydrase enzyme is 0.5% by weight, then minimum molecular mass ofperoxidase anhydrase enzyme is

• 1.576 x 10⁴

• 1.576 X 10³

• 15.76

• 2.136 X 10⁴.

If the Vrms is 30 R^1/2 at 27^oC then calculate the molar mass of gas in kilogram .

• 1 Kg

• 2 Kg

• 0.001 Kg

• 0.002 Kg

336.

A unit cell of sodium chloride has four formula units. The edge length of the unit cell is 0.564 nm. What is the density of sodium chloride?

• 1.2 g/cm³

• 2.165g/cm³

• 3.64 g/cm³

• 4.56 g/cm³

The vapour pressure of pure benzene at a certain temperature is 0.850 bar. A non-volatile, non-electrolyte solid weighing 0.5 g is added to 39.0 g of benzene (molar mass 78 g/mol). The vapour pressure of the solution then is 0.845 bar. What is the molecular mass of the solid substance?

• 58

• 180

• 170

• 145

2.0 molar solution is obtained, when 0.5 mole solute is dissolved in :

• 250 ml solvent

• 250 g solvent

• 250 ml solution

• 1000 ml solvent

What will be the normality of a solution, containing 4.9 g. H₃PO₄ dissolved in 500 ml water ?

• 0.3

• 1.0

• 3.0

• 0.1

Phenolphthalein is not suitable for the titration of :

• NaOH vs (COOH)₂

• KOH vs H₂SO₄

• K₂CO₃ vs HCl

• none of the above