General Science Chemistry MCQs

Chemistry Objective (Multiple Choice) General Knowledge Questions & Answers for SSC-CGL, UPPSC, UPSC, NDA, CDS and UPSC Civil Services Prelims Examination

91. Tap water conducts electricity, whereas distilled water does not. This is because in comparison to distilled water, tap water has __?

[A] polarity
[B] impurity
[C] covalence
[D] surface charge

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92. Which of the following salts has no water of crystallization?

[A] Table salt
[B] Blue Vitriol
[C] Green Vitriol
[D] Baking Soda

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93. Which of the following is a natural dye?

[A] Crystal violet
[B] Aniline blue
[C] Alizarin
[D] Phenolphthalein

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94. “Petroleum” can be categorised under which one of the following terms?

[A] Elements
[B] Hydrocarbons
[C] Polymers
[D] Salts

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95. What percentage of carbon is present in steel?

[A] 0.0 to 2.5
[B] 2.5 to 5.0
[C] 5.0 to 7.5
[D] 7.5 to 10.0

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96. Which metal does not present in the alloy “German Silver”?

[A] Nickel
[B] Zinc
[C] Copper
[D] Silver

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Biogas is composed of Oxygen, Carbon dioxide, Nitrogen, Hydrogen, Methane and Hydrogen Sulphide compounds. Which one of the following compounds forms the majority?

[A] Carbon dioxide
[B] Carbon monoxide
[C] Hydrogen sulphide
[D] Methane

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98. Which one of the following forms the chief constituent of Vinegar?

[A] Formic acid
[B] Acetic acid
[C] Salicylic acid
[D] Oxalic acid

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99. Which is the main source of Naphthalene?

[A] Charcoal
[B] Camphor
[C] Coal-tar
[D] Titanium

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100. Which component is used to harden the rubber in the vulcanization process?

[A] Nitrogen
[B] Silicon
[C] Sulphur
[D] Alcohol

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