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) 1–
(b) 0
(c) 2–
(d) 2+
The correct answers to the above question in:
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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Read more chemistry basic Based General Science Questions and Answers
Question : 1
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 : 2
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 : 3
Which of the following pairs is/are correctly matched?
- 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
Answer »Answer: (b)
Question : 4
The following questions consist of two statements, one labelled as the Assertion (A) and the other as 'Reason (R), You are to examine these two statements carefully and select the answers to these items using the codes given below:
Assertion (A) :
Atomic weights of most of the elements are not whole numbers.
Reason (R) :
Atoms of most of the elements contain mixture of isotopes having different atomic weights.
a) A is true but R is false
b) Both A and R are individually true but R is NOT the correct explanation of A
c) Both A and R are individually true and R is the correct explanation of A
d) A is false but R is true
Answer »Answer: (c)
Question : 5
The nucleus of a singly ionized carbon atom contains
a) 6 protons, 6 neutrons and 6 electrons
b) 5 protons and 6 neutrons
c) 6 protons and 6 neutrons
d) 12 protons, 6 neutrons and 6 electrons
Answer »Answer: (c)
Question : 6
Molecular mass is defined as the
a) mass of one atom compared with the mass of one atom of hydrogen
b) mass of one molecule of any substance compared with the mass of one atom of C-12
c) mass of one atom compared with the mass of one molecule
d) None of these
Answer »Answer: (b)
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