PG TRB Chemistry Previous Year Question Papers with Answers Pdf - 3
Question: 12
The mass of an electron is
(A) 2
(B) 1.602 x 10-19 kg
(C) 9.108 x 10-31 kg
(D) 6.023 x 1023 kg
Ans: C
9.108 x 10-31 kg
Question: 13
Which one of the following metals has the highest density?
(A) Platinum
(B) Lead
(C) Iron
(D) Gold
Ans: A
Platinum
Question: 14
Which is a diatomic molecule?
(A) Argon
(B) Hydrogen
(C) Neon
(D) Helium
Ans: B
Hydrogen
Question: 15
Which one of the following does not wet the walls of the glass vessel in which it is kept?
(A) Alcohol
(B) Mercury
(C) Water
(D) None of these
Ans: B
Mercury
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