when the heat of reaction at constant pressure is -2.5 x 10³ cal can entropy change is 7.4 cal deg^-1 at 25^oC, the reaction is predicted as

• reversible

• Spontaneous

• non -spontaneous

• Irreversible

The volume of water to be added to 100 cm³ of 0.5 NH₂SO₄ to get decinormal concentration is

• 100 cm³

• 450 cm³

• 500 cm³

• 400 cm³

Solid NaHCO₃ will be neutralised by 40.0 mL of 0.1 M H₂SO₄ solution. What would be the weight of solid NaHCO₃ in gram?

• 0.672 g

• 6.07 g

• 17 g

• 20 g

A solution with negative deviation among the following is

• ethanol-acetone

• chlorobenzene-bromobenzene

• chloroform-acetone

• benzene-toluene

For an ideal binary liquid solution with ${\mathrm{p}}_{\mathrm{x}}^0 > {\mathrm{p}}_{\mathrm{y}}^0$ in which relation between X_x (mole fraction of X in liquid phase) and Y_x ( mole fraction of Y in liquid and vapour phase respectively.

• X_x > Y_X

• X_x = Y_x

• $\frac{{\mathrm{X}}_{\mathrm{X}}}{{\mathrm{X}}_{\mathrm{Y}}} < \frac{{\mathrm{Y}}_{\mathrm{X}}}{{\mathrm{Y}}_{\mathrm{Y}}}$

• X_X, Y_X, X_Y and Y_Y cannot be correlated

In an experiment, addition of 4.0 mL of 0.005 M BaCl₂ to 16.0 mL of arsenious sulphide sol just causes complete coagulation in 2 h. The flocculating value of the effective ion is

• Ba²⁺, 1.0

• Ba²⁺, 2.0

• Cl^-, 1.0

• Cl^-, 2.0

517.

The aqueous solution of an unknown sodium salt gives the following reactions.

I. It decolourises a solution of iodine in potassium iodide.

II. It gives white turbidity with dil.HCl solution.

III. It gives a white precipitate with AgNO₃ solution which changes colours and finally becomes black on standing.

The unknown sodium salt is

• Sodium thiosulphate

• sodium bisulphite

• sodium sulphite

• sodium sulphide

Which of the following would exert maximum osmotic pressure?

• Decinormal aluminium sulphate

• Decinormal barium chloride

• Decinormal sodium chloride

• A solution obtained by mixing equal volumes of (b) and (c) and filtering

The one which has least iodine value is

• sunflower oil

• ginger oil

• ghee

• groundnut oil

The vapour pressure of 100g water reduces from 3000 Nm^-2 to 2985 Nm^-2 when 5g of substance 'X' is dissolved in it. Substance 'X' is

• methanol

• glucose

• carbon dioxide

• cannot predict