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

21.    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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22. Which of the following chemicals is also known as "Vitriol of clay”?

[A] Aluminium sulphate
[B] Sodium silicate
[C] Zinc sulphate
[D] Copper(II) sulphate

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23.      Consider the following pairs:

  1. Red vitriol – Cobalt(II) sulphate heptahydrate
  2. Black vitriol – Aluminium sulphate
  3. Vitriol of Mars –  Iron(III) sulphate 

    Which of the above is/are correct?

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

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24.     Consider the following statements:

  1. Addition of salt to pure water increases the boiling point of water and decreases the freezing point of water
  2. When methyl alcohol is added to water, boiling point of water decreases

    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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25. Which of the following is incorrect about the Inter atomic and Intermolecular Forces?

[A] Both the forces are electrical in origin
[B] Both the forces are active over short distances
[C] General shape of force-distance graph is similar for both the forces
[D] None of the above

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26. Which of the following is responsible for the anomalous behaviour of lithium in the periodic table?

[A] exceptionally small size of its atom and ion
[B] high polarising power
[C] Both a and b
[D] None

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27. What is the general electron configuration of all alkaline earth metals?

[A] ns1
[B] ns2
[C] ns2 np6
[D] None of the above

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28. 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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29. Which of the following is correct about Hard water?

[A] it is free from soluble salts of calcium and magnesium
[B] it does not give lather with soap
[C] Both a and b
[D] None of the above

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30. Which of the following elements have a compound named as Hydrogen peroxide?

[A] Hydrogen, Carbon and Oxygen
[B] Hydrogen only
[C] Hydrogen and Oxygen
[D] Hydrogen, Oxygen and Potassium

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