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UPSC 1998 › Science & Technology › Chemistry

7 questions · 1998 · answers as per the UPSC key

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All years of Chemistry · Full UPSC 1998 paper
UPSC 1998 · Q103 · Science & Technology › Chemistry · Save

Match List I with List II

and select the correct answer using the codes given below the lists:

List I I. Potassium bromide II. Potassium nitrate III. Potassium sulphate IV. Mono-potassium tartrate

List II A. Fertiliser B. Photography C. Bakery D. Gunpowder

Codes:

(a) I-B, II-D, III-A, IV-C
(b) I-B, II-D, III-C, IV-A
(c) I-D, II-B, III-C, IV-A
(d) I-D, II-B, III-A, IV-C
Show answer
Answer: (a) I-B, II-D, III-A, IV-C
UPSC 1998 · Q107 · Science & Technology › Chemistry · Save

Which one of the following metals does not form amalgams?

(a) Zinc
(b) Copper
(c) Magnesium
(d) Iron
Show answer
Answer: (d) Iron
UPSC 1998 · Q113 · Science & Technology › Chemistry · Save

Consider the following statements about acetylene: I. It is used in welding industry. II. It is raw material for preparing plastics. III. It is easily obtained by mixing silicon carbide and water. Of these statements:

(a) I and II are correct
(b) I and III are correct
(c) II and III are correct
(d) I, II and III are correct
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Answer: (a) I and II are correct
UPSC 1998 · Q126 · Science & Technology › Chemistry · Save

Match List I with List II

and select the correct answer using the codes given below the lists:

List I I. Blue vitriol II. Epsom salt III. Baking soda IV. Caustic soda

List II A) Sodium bicarbonate

B) Sodium hydroxide

C) Magnesium sulphate

(a) I-C, II-D, III-B, IV-A
(b) I-D, II-C, III-A, IV-B
(c) I-C, II-D, III-A, IV-B
(d) I-D, II-A, III-B, IV-A
Show answer
Answer: (b) I-D, II-C, III-A, IV-B
UPSC 1998 · Q127 · Science & Technology › Chemistry · Save

Assertion (A): Formic acid is a stronger acid than acetic acid.

Reason (R): Formic acid is an organic acid.

(a) Both A and R are true, and R is the correct explanation of A
(b) Both A and R are 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
Show answer
Answer: (b) Both A and R are true, but R is NOT a correct explanation of A
UPSC 1998 · Q129 · Science & Technology › Chemistry · Save

Assertion (A): Phenyl is used as a household germicide.

Reason (R): Phenyl is a phenol derivative and phenol is an effective germicide.

(a) Both A and R are true, and R is the correct explanation of A
(b) Both A and R are 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
Show answer
Answer: (a) Both A and R are true, and R is the correct explanation of A
UPSC 1998 · Q130 · Science & Technology › Chemistry · Save

Assertion (A): Sodium metal is stored under kerosene.

Reason (R): Metallic sodium melts when exposed to air.

(a) Both A and R are true, and R is the correct explanation of A
(b) Both A and R are 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
Show answer
Answer: (c) A is true, but R is false