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) Lother Meyer
(b) Lavoisier
(c) Mendeleev
(d) Henry Moseley
The correct answers to the above question in:
Answer: (b)
Practice classification of elements, chemical bonding, periodicity in properties & physical transformation (set 2) Online Quiz
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Question : 2
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 : 3
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)
$_ZX^A (X) ⟶↖{_-2He^4} _{Z-2}X^{A-4} (Y) ⟶↖{-2{-1}e^0}_ZX^{A-4} (Z)$
Question : 4
A woman desires to clean the surface of her gold ornaments by a chemical approach. For this she requires to use
a) concentrated H2SO4
b) concentrated NaOH
c) aqua-regia
d) sodium thiosulphate solution
Answer »Answer: (c)
Question : 5
Which of the following is correct set of Dobereiner Triads?
a) Be, Mg, Ca
b) F, Cl, I
c) Na, Si, Cl
d) Li, Na, Be
Answer »Answer: (a)
Question : 6
The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong?
a) Metalloid
b) Non-metal
c) Metal
d) Left-hand side element
Answer »Answer: (a)
The given element belongs to carbon family.
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