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

11. How can we prepare Hydrogen at our home?

  1. Immersing alkali metals in water at room temperature
  2. Pouring Sulphuric acid on a copper plate
  3. Boiling zinc with caustic soda
  4. Passing electric current through rainwater

Select the correct option from the codes given below:

[A] Only 1 & 2
[B] Only 1, 3 & 4
[C] Only 2, 3 & 4
[D] 1, 2, 3 & 4

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12. Consider the following:

  1. Atomic number
  2. Atomic mass
  3. Number of protons
  4. Number of neutrons

Which among the above is / are same for each of C-12, C-13 and C-14?

[A] 1 & 3
[B] 2 & 4
[C] 2 & 3
[D] 1 & 4

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13. Which of the following chemicals being used as major ingredients of Bakery Industry in India, are said to cause cancer?

  1. Potassium bromate
  2. Potassium iodate
  3. Potassium sulfate
  4. Potassium chromate

Select the correct option from codes given below:

[A] 1 & 2 Only
[B] 2 & 3 Only
[C] 3 & 4 Only
[D] 1 & 4 Only

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14. Consider the following:
1. Nitrous acid
2. Nitric acid
3. Sulfuric acid
4. Hydrochloric acid
Which among the above are common in Acid rains?

[A] Only 1 & 2
[B] Only 2 & 3
[C] Only 2, 3 & 4
[D] Only 1, 2 & 3

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15. Acid rain is capable of damaging the buildings and historic monuments which are made up of rocks such as limestone and marble. Which among the following is the end product of such
reaction?

[A] Quick Lime
[B] Calcium Carbonate
[C] Calcium Hydroxide
[D] Gypsum

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16. Double Sulphitation is the most commonly used method in India for refining of _?

[A] Crude oil
[B] Cooking oils
[C] Sugar
[D] Coal

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17. Which of the following is not a metalloid?

[A] Boron
[B] Silicon
[C] Germanium
[D] Titanium

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18.     Consider the following pairs:

  1. Water glass – Sodium silicate
  2. Mohr’s salt – Ferrous ammonium sulphate
  3. Caustic soda – Sodium hydroxide

   Which of the above is/are correct?

[A] 1 & 2 Only
[B] 3 Only
[C] 2 & 3 Only
[D] 1, 2 & 3

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19.    Consider the following differences between Hard water and Soft water:

  1. While hard water has high calcium and magnesium content, soft water has high sodium content
  2. Hard water does not easily lather with soap, whereas soft water easily lather with soap

   Which of the above statements is/are correct?

[A] 1 Only
[B] 2 Only
[C] Both 1 & 2
[D] Neither 1 nor 2

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20. Consider the following statements:

  1. Water has high specific heat capacity of than ice
  2. Heat capacity of cooking oil is lower than the heat capacity of water

Which of the above statements is/are correct?

[A] 1 Only
[B] 2 Only
[C] Both 1 & 2
[D] Neither 1 nor 2

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