set 1 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 2 EXERCISES
The following question based on general concepts of chemistry topic of general science mcq
(a) sulphide
(b) sodium
(c) calcium
(d) Both (b) and (c)
The correct answers to the above question in:
Answer: (d)
Ca++ and S– –
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Read more general concepts of chemistry Based General Science Questions and Answers
Question : 1
In the reaction : PbO + C ⟶ Pb + CO
a) C is reductant
b) PbO is oxidised
c) PbO is oxidant
d) Both (a) and (c)
Answer »Answer: (d)
In this carbon reduces PbO to Pb so carbon (C) is reducing agent (reductant) PbO acts as oxidising agent (oxidant) as it oxidises C to CO.
Question : 2
The branch of chemistry which deals with study of the methods of detection and determination of elements and compounds is
a) Analytical chemistry
b) Physical chemistry
c) Nuclear chemistry
d) Bio chemistry
Answer »Answer: (a)
Question : 3
Which of the following statement is not correct ? To prevent food from getting rancid, we
a) flush bags of chips with an inert gas
b) store the food in air-tight containers
c) add antioxidants
d) increase the temperature of the food
Answer »Answer: (d)
Increase the temperature of the food.
Question : 4
The molecular formula P2O5 means that
a) there are twice as many P atoms in the molecule as there are O atoms
b) a molecule contains 2 atoms of P and 5 atoms of O
c) the ratio of the mass of P to the mass of O in the molecule is 2:5
d) the ratio of the mass of P to the mass of O in the molecule is 5 : 2
Answer »Answer: (b)
Question : 5
Chemical formula of Aluminium sulphate is
a) Al3(SO4)2
b) Al2 (SO4)3
c) AlSO4
d) None of these
Answer »Answer: (b)
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