25 cm³ of oxalic acid completely neutralised 0.064 g of sodium hydroxide. Molarity of the oxalic acid solution is

• 0.064

• 0.045

• 0.015

• 0.032

5.5 mg of nitrogen gas dissolves in 180 g of water at 273 K and 1 atm pressure due to nitrogen gas. The mole fraction of nitrogen in 180 g of water at 5 atm nitrogen pressure is approximately

• 1 × 10^-6

• 1 × 10^-5

• 1 × 10^-3

• 1 × 10^-4

50 cm³ of 0.04 M K₂Cr₂O₇ in acidic medium oxidises a sample of H₂S gas to sulphur. Volume of 0.03 M KMnO₄ required to oxidize the same amount of H₂S gas to sulphur, in acidic medium is 

• 60 cm³

• 80 cm³

• 90 cm³

• 120 cm³

0.06% (w/V) aqueous solution of urea is isotonic with

• 0.06% glucose solution

• 0.6% glucose solution

• 0.01M glucose solution

• 0.1M glucose solution

The number of oxygen atoms in 4.4gm of CO₂ is

• 1.2 × 10²³

• 6 × 10²²

• 6 × 10²³

• 12 × 10²³

0.30 g of an organic compound containing C, H and oxygen on combustion yields 0.44 g of CO₂ and 0.18 g of H₂O. If one mole of compound weighs 60, then molecular formula of the compound is

• CH₂O

• C₃H₈O

• C₄H₆O

• C₂H₄O₂

What amount of dioxygen (in gram) contains 1.8 × 10²² molecules?

• 0.0960

• 0.960

• 9.60

• 96.0

208.

An organic compound contains C = 40%, H = 13.33% and N = 46.67%. Its empirical formula is

• C₂H₂N

• C₃H₇N

• CH₄N

• CHN

The mass of BaCO₃ produced when excess CO₂ is bubbled through a solution of 0.205 mole Ba(OH) is :

• 81 gm

• 40.5 gm

• 20.25 gm

• 162 gm

A compound contains 54.55% carbon, 9.09% hydrogen, 36.36% oxygen. The empirical formula of this compound is:

• C₃H₅O

• C₄H₈O₂

• C₂H₄O₂

• C₂H₄O