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
X $βΆβ{λ_1} β{-α particle} Y βΆβ{λ_2} β{-2β particles} Z$
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
The correct answers to the above question in:
Answer: (b)
$_ZX^A (X) βΆβ{_-2He^4} _{Z-2}X^{A-4} (Y) βΆβ{-2{-1}e^0}_ZX^{A-4} (Z)$
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Read more chemistry Based General Science Questions and Answers
Question : 1
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 : 2
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 : 3
The number of elements in the third period of periodic table is
a) 8
b) 18
c) 2
d) 32
Answer »Answer: (a)
Question : 4
Amongst the following statements, which are correct?
- The ceaseless zig-zag motion of sol particles is due to the unbalanced bombardment of particles by the molecules of dispersion medium
- The intensity of zig-zag motion increases with the increase in the size of the particles
- The zig-zag motion of particles becomes intense at high temperature
- This motion has a stirring effect which does not permit the particles to settle
a) 1, 2 and 4
b) 1, 2 and 3
c) 1, 3 and 4
d) 2, 3 and 4
Answer »Answer: (c)
Question : 6
The early attempt to classify elements as metals and nonmetals was made by
a) Lother Meyer
b) Lavoisier
c) Mendeleev
d) Henry Moseley
Answer »Answer: (b)
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