set 2 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 4 EXERCISES
The following question based on classification of elements, chemical bonding, periodicity in properties & physical transformation topic of general science mcq
(a) 8
(b) 18
(c) 2
(d) 32
The correct answers to the above question in:
Answer: (a)
Practice classification of elements, chemical bonding, periodicity in properties & physical transformation (set 2) Online Quiz
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Read more chemistry Based General Science Questions and Answers
Question : 1
Which of the following is an actinide?
a) Polonium
b) Promethium
c) Plutonium
d) Palladium
Answer »Answer: (c)
Question : 2
Consider the following statements :
- 22gm. of $CO_2$ consist of 1 mole.
- Number of molecules in 4 gm of oxygen is $10^22$.
- Mass of 1 mole of a substance is called its formula mass.
a) 1 and 3
b) 1 and 2
c) 2 and 3
d) 1, 2 and 3
Answer »Answer: (d)
1 mole of CO2 = 44g Mass of 1 mole of a substance is called molar mass.
Question : 3
Pasteurization is related to
a) Dehydration of milk
b) Fermentation of milk
c) Sterilization of milk
d) Distillation of milk
Answer »Answer: (c)
Question : 4
Most of the explosions in mines occur due to the mixing of
a) oxygen with acetylene
b) methane with air
c) hydrogen with oxygen
d) carbon dioxide with ethane
Answer »Answer: (a)
Question : 5
Elements of which group form anions most readily?
a) Nitrogen family
b) Halogens
c) Oxygen family
d) Alkali metals
Answer »Answer: (b)
Halogens are the most electronegative elements.
i.e., they are likely to form anions most readily.
Question : 6
A radioactive element X emits an α-particle followed by 2 β-particles in the successive steps as :
X $⟶↖{λ_1} ↙{-α particle} Y ⟶↖{λ_2} ↙{-2β particles} Z$
Which of the following statement(s) is/are correct?
- Y and Z are isotopes
- The atomic number of X and Z are the same
- Y and Z are isobars
- The mass number of Y is greater than X
a) 1 and 4
b) 2 and 3
c) Only 1
d) Only 3
Answer »Answer: (b)
$_ZX^A (X) ⟶↖{_-2He^4} _{Z-2}X^{A-4} (Y) ⟶↖{-2{-1}e^0}_ZX^{A-4} (Z)$
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