🧪 Chemistry MCQ Questions
Set – 2 | General Science & Competitive Exams
Click on each question to see the correct answer and explanation
Q11. What is the usual property of oxides of Group III and IV elements?
- (A) Both acidic and basic
- (B) Acidic
- (C) Neutral
- (D) Basic
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Correct answer is Basic. Oxides of Group III and IV elements are generally basic in nature.
Q12. Which element is found in maximum proportion in the soil?
- (A) Oxygen
- (B) Silicon
- (C) Nitrogen
- (D) Manganese
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Correct answer is Oxygen. Oxygen is the most abundant element in soil, mostly as oxides and silicates.
Q13. Which element is present in the largest amount by mass in the Earth’s crust?
- (A) Calcium
- (B) Carbon
- (C) Oxygen
- (D) Silicon
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Correct answer is Oxygen. Oxygen makes up about 46% of the Earth’s crust by mass.
Q14. After oxygen, which is the next most abundant element in the Earth’s crust?
- (A) Sodium
- (B) Chlorine
- (C) Silicon
- (D) Carbon
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Correct answer is Silicon. Silicon is the second most abundant element in the crust, forming silicates.
Q15. Which pair represents the lightest and heaviest metals respectively?
- (A) Lithium and Osmium
- (B) Lithium and Mercury
- (C) Aluminium and Mercury
- (D) Aluminium and Osmium
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Correct answer is Lithium and Osmium. Lithium is the lightest metal; Osmium is the densest/heaviest metal.
Q16. Among the following, which is the hardest naturally occurring substance?
- (A) Platinum
- (B) Quartz
- (C) Diamond
- (D) Glass
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Correct answer is Diamond. Diamond has the highest hardness on the Mohs scale (10).
Q17. Which of the following is the electron configuration of a typical metallic element?
- (A) 2, 8, 8
- (B) 2, 8, 8, 2
- (C) 2, 8, 7
- (D) 2, 8
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Correct answer is 2, 8, 8, 2. Metals usually have 1–3 electrons in their outermost shell, e.g., Calcium (2, 8, 8, 2).
Q18. Which oxide type is generally acidic?
- (A) Oxides of metals
- (B) Oxides of non-metals
- (C) Oxides of noble gases
- (D) Oxides of alkali metals
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Correct answer is Oxides of non-metals. Non-metal oxides like CO₂, SO₂ are acidic when dissolved in water.
Q19. Which metal is the lightest among the following?
- (A) Magnesium
- (B) Aluminium
- (C) Lithium
- (D) Iron
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Correct answer is Magnesium. Magnesium is lighter than Aluminium but heavier than Lithium in density context.
Q20. Which of the following elements is highly abundant in silicate minerals?
- (A) Silicon
- (B) Calcium
- (C) Magnesium
- (D) Nitrogen
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Correct answer is Silicon. Silicon is a major component of silicate minerals, which dominate the Earth’s crust.
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