set 2 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 4 EXERCISES
The following question based on metals, non metals, minerals, ores, properties, uses topic of general science mcq
(a) smelting
(b) roasting
(c) calcination
(d) liquation
The correct answers to the above question in:
Answer: (b)
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Read more chemistry gk Based General Science Questions and Answers
Question : 1
The metal used to built bridges is
a) platinum
b) gold
c) silver
d) iron
Answer »Answer: (d)
Steel an alloy of iron and carbon is used for manufacturing bridges.
Question : 2
Which one of the following elements cannot displace hydrogen gas from a dilute acid?
a) Copper
b) Magnesium
c) Zinc
d) Iron
Answer »Answer: (a)
Question : 3
Chemically rust is
a) ferric oxide only
b) hydrated ferric oxide only
c) hydrated ferrous oxide only
d) ferrous oxide only
Answer »Answer: (b)
As the chemical formula of rust is Fe2O3 . xH2O
Question : 4
Which of the following non-metals sublimes on heating ?
a) Bromine
b) Fluorine
c) Chlorine
d) Iodine
Answer »Answer: (d)
Iodine is a sublime substance
Question : 5
Removal of impurities from ore is known as -
a) calcination
b) crushing and grinding
c) concentration of ore
d) roasting
Answer »Answer: (c)
Question : 6
Which one of the following is the correct order in which the gases H2, Ne, O2 and N2 are evolved on fractional distillation of liquid air?
a) H2, Ne, N2, O2
b) N2, O2, Ne, H2
c) H2, Ne, O2, N2
d) O2, N2, H2, Ne
Answer »Answer: (a)
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