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CBSE

Chemistry

NEET Chemistry : Hydrogen

51.

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.

52.

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.

53.

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:

54.

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

55.

The reagent with which the following reaction is best accomplished is

56.

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

57.

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

RCl + H₂O → ROH + HCl

58.

Ortho and para hydrogens have

59.

In which of the following molecules is hydrogen bridge bond present?

60.

Blackened oil painting can be restored into original form by the action of

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