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UPSC 2002 › Science & Technology › Chemistry

4 questions · 2002 · answers as per the UPSC key

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UPSC 2002 · Q28 · Science & Technology › Chemistry · Save

Which one of the following statements is correct?

(a) The boiling point of an aqueous solution is higher than that of pure water
(b) Addition of solutes to a solution causes an increase in its water potential
(c) The vapour pressure of the water in a solution is lower than that of pure water
(d) When a solution is separated from water by a semi permeable membrane, water movement can be prevented by applying pressure to the solution
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Answer: (b) Addition of solutes to a solution causes an increase in its water potential
UPSC 2002 · Q110 · Science & Technology › Chemistry · Save

Match List I (Oxidation number) with List II (The element) and select the correct answer using the codes given below the lists:

  1. Oxidation number of Mn in MnO₂ B. 3 —
  2. Oxidation number of S in H₂S₂O₇ C. 4 —
  3. Oxidation number of Ca in CaO₂ D. 6 —
  4. Oxidation number of Al in NaAlH₄

List I (Oxidation number) — List II (The element) A. 2 —

(a) A-3, B-4, C-1, D-2
(b) A-4, B-3, C-1, D-2
(c) A-3, B-4, C-2, D-1
(d) A-4, B-3, C-2, D-1
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Answer: (a) A-3, B-4, C-1, D-2
UPSC 2002 · Q143 · Science & Technology › Chemistry · Save

Assertion (A): With the increase of temperature, the viscosity of glycerine increases.

Reason (R): Rise of temperature increases kinetic energy of molecules.

(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and R are individually true but R is not a correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
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Answer: (d) A is false but R is true
UPSC 2002 · Q145 · Science & Technology › Chemistry · Save

Assertion (A): Synthetic detergents can lather well in hard water.

Reason (R): Synthetic detergents form soluble calcium and magnesium salts with hard water.

(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and R are individually true but R is not a correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
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Answer: (a) Both A and R are individually true and R is the correct explanation of A