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6 questions · 2003 · answers as per the UPSC key

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All years of Chemistry · Full UPSC 2003 paper
UPSC 2003 · Q29 · Science & Technology › Chemistry · Save

Which one of the following statements is correct?

(a) Liquid sodium is employed as a coolant in nuclear reactors
(b) Calcium carbonate is an ingredient of toothpaste
(c) Bordeaux mixture consists of sodium sulphate and lime
(d) Zinc amalgams are used as a dental filling
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Answer: (a) Liquid sodium is employed as a coolant in nuclear reactors
UPSC 2003 · Q45 · Science & Technology › Chemistry · Save

Consider the following statements The purpose of adding sodium sulphate and sodium silicate to the detergent in a washing powder is

  1. To keep the washing powder dry
  2. To maintain the alkalinity of the powder

Which of these statements is/are correct?

(a) Only 1
(b) Only 2
(c) Both 1 and 2
(d) Neither 1 nor 2
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Answer: (c) Both 1 and 2
UPSC 2003 · Q105 · Science & Technology › Chemistry · Save

Assertion (A): In the periodic table of chemical elements, electron affinity is always found to increase from top to bottom in a group.

Reason (R): In a group, the atomic radius generally increases from top to bottom.

(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 the 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 2003 · Q108 · Science & Technology › Chemistry · Save

Assertion (A): Unsaturated fats are more reactive compared with the saturated fats.

Reason (R): Unsaturated fats have only single bonds in their structure.

(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 the 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: (c) A is true but R is false
UPSC 2003 · Q144 · Science & Technology › Chemistry · Save

With reference to ionic compounds, consider the following statements:

  1. Ionic compounds are insoluble in alcohol.
  2. Ionic compounds in the solid state are good conductors of electricity.

Which of these statements is/are correct?

(a) Only 1
(b) Only 2
(c) Both 1 and 2
(d) Neither 1 nor 2
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Answer: (a) Only 1
UPSC 2003 · Q145 · Science & Technology › Chemistry · Save

Which one of the following statements is correct?

(a) The presence of NaCl increases the rate of setting of Plaster of Paris
(b) Gypsum is added to the cement to slow down its rate of setting
(c) All alkaline earth metals form hydrated salts
(d) Barium and Strontium are found free in nature
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Answer: (d) Barium and Strontium are found free in nature