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) C is reductant
(b) PbO is oxidised
(c) PbO is oxidant
(d) Both (a) and (c)
The correct answers to the above question in:
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.
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Read more general concepts of chemistry Based General Science Questions and Answers
Question : 1
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 : 2
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 : 3
Which one is a combination reaction ?
a) Ca(OH)2 + Na2CO3 ⟶ 2NaOH + CaCO3 ↓
b) Formation of a mixture of carbon monoxide and hydrogen. When steam is passed over red hot iron.
c) Reaction of water with sodium metal to form sodium hydroxide and hydrogen.
d) Preparation of stannic chloride (Tin (iv) chloride) by passing chlorine gas into molten tin (Sn).
Answer »Answer: (d)
Sn + 2Cl2 SnCl4.
Question : 4
Which one is a bivalent ion?
a) sulphide
b) sodium
c) calcium
d) Both (b) and (c)
Answer »Answer: (d)
Ca++ and S– –
Question : 5
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 : 6
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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