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Chemistry - General Science MCQs for Competitive Exams | Page-4

31 When there are two electrons in the same orbital, they have:
A same spin
B opposite spin
C Same or opposite spin
D no spin

Answer: Option [B]
32 Wax is chemically a mixture of
A aliphatic hydrocarbon
B cyclic hydrocarbon
C aromatic hydrocarbon
D aliphatic and aromatic hydrocarbon

Answer: Option [A]


33 Ultra violet radiation striking the earth is due to the depletion of
A oxygen
B ozone
C carbon dioxide
D carbon monoxide

Answer: Option [B]
34 Galvanisation is the
A deposition of aluminium on iron
B deposition of copper on iron
C deposition of tin on iron
D deposition of zinc on iron

Answer: Option [D]
35 What is the most commonly used substance in fluorescent tubes
A Sodium vapour and Neon
B Sodium oxide and Argon
C Mercury vapour and Argon
D Mercury oxide and Neon

Answer: Option [C]
36 Which of the following gas is chiefly present in LPG (liquefied petroleum gas)
A Butane
B Propane
C Ethane
D Methane

Answer: Option [A]
37 Which among the following stage is suitable indicator when solution of sodium carbonate is mixed with sulphuric acid
A Methyl red
B Methyl orange
C Methylene blue
D Phenolphthaline

Answer: Option [B]
38 Bauxite is an alloy of which of the following metals?
A Iron
B Tin
C Silver
D Aluminium

Answer: Option [D]
39 Cement is made hard with
A dehydration
B polymerization
C dissociation of water
D hydration and dissociation of water

Answer: Option [D]
40 Table salt get moist during rainy season because
A Sodium chloride is deliquescent
B Sodium chloride is hydroscopic
C Sodium chloride contains some quantity of Sodium iodide
D Sodium chloride contains hydroscopic impurities like magnesium chloride

Answer: Option [D]


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