set 2 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 3 EXERCISES
The following question based on atomic structure, molecules and nuclear chemistry topic of general science mcq
(a) W
(b) Tc
(c) Ta
(d) V
The correct answers to the above question in:
Answer: (a)
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Read more chemistry basic Based General Science Questions and Answers
Question : 1
1 u or 1 amu means
a) Mass of O-16 atom
b) Mass of C-12 atom
c) 1/12th mass of C-12 atoms
d) Mass of Hydrogen molecule
Answer »Answer: (c)
Question : 2
The isoneutronic group, in the following is
a) $^{6}C_{12}, ^{7}N_{14}, ^8N_{18}$
b) $^6C_{14}, ^7N_{14}, ^8O_{16}$
c) $^6C_{12}, ^7N_{14}, ^8O_{16}$
d) $^6C_{14}, ^7N_{15}, ^8O_{16}$
Answer »Answer: (d)
Question : 3
The atomic number of an element is 11 and its mass number is 23. The correct order representing the number of electrons, protons and neutrons respectively in this atom is
a) 11, 12, 11
b) 12, 11, 11
c) 11, 11, 12
d) 23, 11, 23.
Answer »Answer: (c)
no. of proton = At no.= number of e– = 11 no. of p + no. of n = Atomic mass
∴ no. of n = 13 – 11 = 12
Question : 4
When an atom loses electrons, it is called a (an) _____ and has a ______ charge.
a) cation, positive
b) anion, negative
c) anion, positive
d) cation, positive
Answer »Answer: (a)
e.g., $Na ⟶ {Na}^{+} ↙ {(cation)}$+ e-
Question : 5
Age of fossil may be found out by determining the ratio of two isotopes of carbon. The isotopes are
a) C-12 and C-14
b) C-13 and C-14
c) C-12 and C-13
d) C-12 and carbon black
Answer »Answer: (a)
Question : 6
Which one of the following pairs constitutes particle-antiparticle pair?
a) Proton-Neutron
b) Photon-Electron
c) Electron-Positron
d) Neutron-Neutrino
Answer »Answer: (c)
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