121.

Assertion : Compressibility factor for hydrogen varies with pressure with positive slope at all pressures.

Reason : Even at low pressures, repulsive forces dominate hydrogen gas.

• 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.

The reagent commonly used to determine hardness of water titrimetrically is

• oxalic acid

• disodium salt of EDTA

• sodium citrate

• sodium thiosulphate

Assertion : Increasing pressure on pure water decreases its freezing point.

Reason : Density of water is minimum at 273 K.

• If both assertion and reason are true and the reason is the correct explanation of the assertion.

• If both assertion and reason are true and the reason is not the correct explanation of the assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion : The micelle formed by sodium stearate in water has - COO^- groups at the surface.

Reason : Surface tension of water is reduced by the addition of stearate.

• If both assertion and reason are true and the reason is the correct explanation of the assertion.

• If both assertion and reason are true and the reason is not the correct explanation of the assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

When H₂O₂ is shaken with an acidified solution of K₂Cr₂O₇ in the presence of ether, the ethereal layer turns blue due to the formation of:

• Cr₂O₃

• CrO₄^2-

• Cr₂(SO₄)₃

• CrO₅

Commercial sample of H₂O₂ is labeled as 10 V. Its % strength is nearly

• 3

• 6

• 9

• 12

The reagent with which the following reaction is best accomplished is

• H₃PO₂

• H₃PO₃

• H₃PO₄

• NaHSO₃

The order of decreasing ease of abstraction of hydrogen atoms in the following molecule

• H_a > H_b > H_c

• H_a > H_c > H_b

• H_b > H_a > H_c

• H_c > H_b > H_a

In the hydrolysis of an organic chloride in presence of large excess of water

RCl + H₂O → ROH + HCl

• molecularity and order of reaction both are 2

• molecularity is 2 but order of reaction is 1

• molecularity is 1 but order of reaction is 2

• molecularity is 1 but order of reaction is also 1

Ortho and para hydrogens have

• Identical chemical properties but different physical properties 

• Identical physical and chemical properties 

• Identical physical properties  but different chemical properties 

• Different chemical and physical properties