541.

A solution made by dissolving 40 g NaOH in 1000 g of H₂O is

• 1 molar

• 1 normal

• 1 molal

• None of these

0.1 mol HCl is equal to

• 3.65 g

• 36.5 g

• 18 g

• 1.8 g

A 0.5 g/L solution of glucose is found to be isotonic with a 2.5 g/L solution of an organic compound. What will be the molecular weight of that organic compound ?

• 300

• 600

• 900

• 200

The pH of a 0.001 M solution of HCl is

• 0

• 3

• 5

• 10

The mass of carbon anode consumed (giving only carbondioxide) in the production of 270 kg of aluminium metal from bauxite by the Hall process is (Atomic mass Al= 27)

• 180 kg

• 270 kg

• 540 kg

• 90 kg

The number of moles of KMnO₄ reduced by one mole of KI in alkaline medium is

• one-fifth

• five

• one

• two

A solution has a 1 : 4 mole ratio of pentane to hexane. The vapour pressure of the pure hydrocarbons at 20$°$C are 440 mm of Hg for pentane and 120 mm of Hg for hexane. The mole fraction of pentane in the vapour phase would be

• 0.549

• 0.200

• 0. 786

• 0.478

If for a sucrose solution, elevation in boiling point is 0.1°C, then what will be the boiling point of NaCl solution for same molal concentration ?

• 0.1$°$C

• 0.2$°$C

• 0.08$°$C

• 0.01$°$C

The vapour pressure of pure water is 25.0 mm Hg and that of an aqueous dilute solution of urea in 20mm Hg at 25°C. The molarity of the solution is:

• 12.6

• 14.9

• 13.8

• 9.6

The significant figures in 1.0024, 1.240 and 0.0020 are respectively

• 5, 4, 2

• 3, 3, 1

• 5, 3, 4

• 5, 3, 2