Chemistry MCQs

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

1. Which among the following is a Noble Gas?
[A] Nitrogen
[B] Hydrogen
[C] Oxygen
[D] Helium

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2. Cassiterite is a primary ore of which of the following elements?
[A] Iron
[B] Zinc
[C] Copper
[D] Tin

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3. Ground Level Ozone is formed due to reaction between:
[A] VOCs, Oxides of Nitrogen & Sunlight
[B] VOCs, Sulphur dioxide & Sunlight
[C] Ozone, Sulphur dioxide & Oxides of Nitrogen
[D] Ozone, Oxides of Nitrogen & Sunlight

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4. Which of the following chemicals is called Philosopher’s Wool?
[A] Brimstone
[B] Zinc oxide
[C] Magnesium hydroxide
[D] Potassium nitrate

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5. Which of the following is NOT correct about Alkynes?
[A] They contain at least two triple bond between two carbon atoms
[B] The number of hydrogen atoms is less in alkynes as compared to alkenes
[C] The general formula of Alkynes is CnH2n–2
[D] All are correct

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6. Which of the following is not a mixture?
[A] Ocean water
[B] Table salt
[C] Air
[D] Soil

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7. Which of these ores is not an oxide?
[A] Sphalerite
[B] Haematite
[C] Cuprite
[D] Magnetite

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8. Which of the following reactions represents changing of green colour of ferrous sulphate?
[A] Double Displacement reaction
[B] Displacement reaction
[C] Combination reaction
[D] Decomposition reaction

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9. What do we call the reaction when an acid and a base react together to form salt and water?
[A] Reduction Reaction
[B] Oxidation Reaction
[C] Neutralisation Reaction
[D] Combination Reaction

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10. What happens to the effective nuclear charge as we move from left to right in the periodic table?
[A] It increases
[B] it decreases
[C] It remains constant
[D] It increases till 4th group then decreases

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