Chemistry - Questions and Answers, General Study (GK)

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Chemistry - Questions and AnswersPage 13

121.

A moderator is used in nuclear reactors in order to

(a)Increase the number of neutrons

(b)Decrease the number of neutrons

(c)Slow down the speed of neutrons

(d)Accelerate the neutrons

Comment

Answer is: CNA

122.

REM is a unit of

(a)Radiation dosage

(b)Binding energy

(c)Packing fraction

(d)Radioactivity

Comment

Answer is: ANA

123.

A radioactive decay process has a half-life of 4 yr. The amount of the reactant remaining after 12 yr is

(a)10%

(b)12.5%

(d)87.5%

Comment

Answer is: BNA

124.

The α-particles carries two positive charges. Its mass is very nearly equal to that of

(a)Two protons

(b)An atom of helium

(c)Sum of masses of two positrons and two neutrons

(d)Two positrons as each position carries a single positive charge

Comment

Answer is: BNA

125.

Emission of β-particle form an atom

(a)Increases the number of protons in the atom

(b)Increases the number of neutrons in the atom

(c)Decreases the number of protons in the atom

(d)Does not change the number of neutrons and protons in an atom

Comment

Answer is: ANA

126.

Coordinate covalent compound are formed by

(a)Transfer of electrons

(b)Sharing if electrons

(c)Donation of electrons

(d)None of the above

Comment

Answer is: DNA

127.

A coordinate bond is formed when an atom in a molecule has

(a)Electric charge on it

(b)All its valency electrons shared

(c)A single unshared electron

(d)One or more unshared electron

Comment

Answer is: ANA

128.

The four bonds of CCl4 are directed in space at an angle of

(a)90°

(b)120°

(d)128°09'

Comment

Answer is: CNA

129.

Which of following contains both ionic and covalent bond?

(a)H₂O

(b)NaOH

(c)C₆H₆

(d)CO₂

Comment

Answer is: BNA

130.

The shape of carbon dioxide molecule is

(a)Octahedral

(b)Tetrahedral

(c)Linear

(d)Trigonal

Comment

Answer is: CNA

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Chemistry - Questions and AnswersPage 13

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