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6 questions · 2001 · answers as per the UPSC key

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All years of Chemistry · Full UPSC 2001 paper
UPSC 2001 · Q116 · Science & Technology › Chemistry · Save

Assertion (A): A chemical reaction becomes faster at higher temperatures.

Reason (R): At higher temperatures, molecular motion becomes more rapid.

Which of the following is correct?

(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
UPSC 2001 · Q117 · Science & Technology › Chemistry · Save

Which one of the following is NOT radioactive?

(a) Astatine
(b) Francium
(c) Tritium
(d) Zirconium
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Answer: (d) Zirconium
UPSC 2001 · Q118 · Science & Technology › Chemistry · Save

Which one of the following is the correct sequence in increasing order of molecular weights of the hydrocarbons?

(a) Methane, ethane, propane and butane
(b) Propane, butane, ethane and methane
(c) Butane, ethane, propane and methane
(d) Butane, propane, ethane and methane
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Answer: (a) Methane, ethane, propane and butane
UPSC 2001 · Q119 · Science & Technology › Chemistry · Save

In an atom, the order of filling up of the orbitals is governed by

(a) Aufbau principle
(b) Heisenberg’s uncertainty principle
(c) Hund’s rule
(d) Pauli’s exclusion principle
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Answer: (a) Aufbau principle
UPSC 2001 · Q120 · Science & Technology › Chemistry · Save

An aqueous solution of copper sulphate is acidic in nature because the salt undergoes

(a) dialysis
(b) electrolysis
(c) hydrolysis
(d) photolysis
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Answer: (c) hydrolysis
UPSC 2001 · Q121 · Science & Technology › Chemistry · Save

Consider the following statements with reference to the Periodic Table of chemical elements: I. Ionisation potential gradually decreases along a period. II. In a group of elements, electron affinity decreases as the atomic weight increases. III. In a given period, electronegativity decreases as the atomic number increases.

Which of these statement(s) is/are correct?

(a) I only
(b) II only
(c) I and III
(d) II and III
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Answer: (b) II only