36 g water and 828 g ethyl alcohol form an ideal solution. The mole fraction of water in it, is :

• 1.0

• 0.7

• 0.4

• 0.1

The weight of one molecule of a compound C₆₀H₁₂₀ is :

• 1.2 x 10^-20 g

• 5.025 x 10²³ g

• 1.4 x 10^-21 g

• 6.023 x 10²³ g

MnO${}_4^{2-}$ (1 mole) in neutral aqueous medium is disproportionated to

• 2/3 mole of MnO${}_4^{-}$ and 1/3 mole of MnO₂

• 1/3 mole of MnO${}_4^{-}$ and 2/3 mole of MnO₂

• 1/3 mole of Mn₂O₇ and 1/3 mole of MnO₂

• 2/3 mole of Mn₂O₇ and 1/3 mole of MnO₂

Assertion : Effusion rate of oxygen is smaller than nitrogen.

Reason: Molar mass of nitrogen is smaller than oxygen.

• 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.

How many litres of ammonia gas at S.T.P. would 1 be needed to prepare 100 ml of 2.5 M ammonium hydroxide solution?

• 5.6 L

• 0.056 L

• 11.2 L

• 0.56 L

If 0.189 g of a chlorine containing organic compound gave 0.287 g of silver chloride, then the percentage of chlorine in the organic compound is

• 35.47

• 35.57

• 37.57

• 45.37

How many grams of concentrated nitric acid solution should be used to prepare 250 mL of 2.0M HNO₃ ? The concentrated acid is 70% HNO₃.

• 45.0 g conc. HNO₃

• 90.0 g con. HNO₃

• 70.0 g conc. HNO₃

• 54.0 g conc. HNO₃

The system that contains the maximum number of atoms is

• 4.25 g of NH₃

• 8 g of O₂

• 2 g of H₂

• 4 g of He

The weight of oxalic acid that will be required to prepare a 1000 ml (N/20) solution is:

• 126/100 g

• 63/40 g

• 63/20 g

• 126/20 g

In 'x' mL 0.3 N HCl, the addition of 200 mL distilled water or addition of 100 mL 0.1 N NaOH, gives the same final acid strength. Determine 'x'.