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
- Isotopes : Atoms with same atomic number but different atomic mass
- Isobars : Atoms with same number of neutrons but different atomic number
- Isotones : Atoms with same mass number but different atomic number
(a) 1 and 2 only
(b) 1 only
(c) 1, 2 and 3
(d) 2 only
The correct answers to the above question in:
Answer: (b)
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Read more chemistry basic Based General Science Questions and Answers
Question : 1
The cathode ray experiment was done for the first time by
a) John Dalton
b) Goldstein
c) J.J. Thomson
d) Rutherford
Answer »Answer: (c)
Question : 2
Which one of the following is heavy water used in nuclear reactor?
a) Water at 4°C but having molecular weight 19 u
b) Water having molecular weight 20 u
c) Water having molecular weight 18 u
d) Water below the ice in a frozen sea
Answer »Answer: (b)
Question : 3
Which one of the following reactions is the main cause of the energy radiation from the Sun?
a) Chemical reaction
b) Fission reaction
c) Fusion reaction
d) Diffusion reaction
Answer »Answer: (c)
Question : 4
Which of the following pairs are isotopes?
a) Ice and steam
b) Nitric oxide and nitrogen dioxide
c) Oxygen and ozone
d) Hydrogen and deuterium
Answer »Answer: (d)
Question : 5
The atomic weights are expressed in terms of atomic mass unit. Which one of the following is used as a standard?
a) 12C6
b) 16O8
c) 1H1
d) 35Cl17
Answer »Answer: (a)
12C6 used as a standard in the expression of atomic weights in term of amu.
Question : 6
Which would be the electrical charge on a sulphur atom containing 18 electrons ?
a) 1–
b) 0
c) 2–
d) 2+
Answer »Answer: (c)
S(16) = 2, 8, 6
Hence S(18) need two or more electron to complete its octet.
i.e S + 2e– ⟶ S– –
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