The mixture ofconcentrated HCl and HNO₃ made in 3 : 1 ratio contains

• ClO₂

• NOCl

• NCl₃

• N₂O₄

The average osmotic pressure of human blood is 7.8 bar at 37°C. What is the concentration of an aqueous NaCl solution that could be used in the blood stream?

• 0.16 mol/L

• 0.32 mol/L

• 0.60 mol/L

• 0.45 mol/L

Which one of the statements given below concerning properties of solutions, describes a colligative effect?

• Boiling point of pure water decreases by the addition of ethanol.

• Vapour pressure of pure water decreases by the addition of nitric acid.

• Vapour pressure of pure benzene decreases by the addition of naphthalene.

• Boiling point of pure benzene increases by the addition of toluene.

Which one of the following is not a buffer solution?

• 0.8M H₂S + 0.8M KHS

• 2M C₆H₅NH₂ + 2M C₆H₅NH₃^-Br^-

• 3M H₂CO₃ + 3M KHCO₃

• 0.05M KClO₄ + 0.05M HClO₄

In aqueous alkaline solution, two electrons reduction of HO${}_2^{-}$ gives

• HO^-

• H₂O

• O₂

• ${\mathrm{O}}_2^{-}$

Vapour pressure of benzene at 30°C is 121.8 mm. When 15 g of a non-volatile solute is dissolved in 250 g of benzene, its vapour pressure is decreased to 120.2 mm. The molecular weight of the solute is

• 35.67 g

• 356.7 g

• 432.8 g

• 502. 7 g

58.4 g of NaCl and 180 g of glucose were separately dissolved in l000mL of water. Identify the correct statement regarding the elevation of the boiling point (b.p) of the resulting solutions.

• NaCl solution will show higher elevation of boiling point

• Glucose solution will show higher elevation of boiling point

• Both the solutions will show equal elevation of boiling point

• The boiling point elevation will be shown by neither of the solutions

Which of the following will show a negative deviation from Raoult's law?

• Acetone-benzene

• Acetone-ethanol

• Benzene-methanol

• Acetone-chloroform

To observe an elevation of boiling point of 0.05°C, the amount of a solute (mol. wt. = 100) to be added to 100 g of water (K_b = 0.5) is

• 2 g

• 0.5 g

• 1 g

• 0.75 g

Solubility product of Mg(OH)₂ at ordinary temperature is 1.96 × 10^-11 pH of a saturated solution of Mg(OH)₂ will be

• 10.53

• 8.47

• 6.94

• 3.47