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) Al3(SO4)2
(b) Al2 (SO4)3
(c) AlSO4
(d) None of these
The correct answers to the above question in:
Answer: (b)
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Question : 1
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 : 2
Which one is a bivalent ion?
a) sulphide
b) sodium
c) calcium
d) Both (b) and (c)
Answer »Answer: (d)
Ca++ and S– –
Question : 3
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.
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