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. Which of the following chemicals is used as a molecular sieve to filter common salts from seawater to produce potable water?

[A] Graphene oxide
[B] Phosgene
[C] Sodium hypochlorite
[D] Calcium carbonate

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22.   Consider the following statements about the Coalbed Methane:

  1. It is called 'sweet gas' because of its lack of hydrogen sulphide
  2. It contains very little heavier hydrocarbons such as propane or butane

  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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23. Which of the following strains is produced in a body if the deforming force produces a change in the shape of the body without changing its volume?

[A] Linear
[B] Volumetric
[C] Shearing
[D] All of the above

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24. What is the name given to the linear strain produced in the direction of deforming force?

[A] Linear strain
[B] Longitudinal strain
[C] Directional strain
[D] Zero strain

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25. Which of the following element has the highest first ionization enthalpy?

[A] Magnesium
[B] Strontium
[C] Beryllium
[D] Barium

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26. Which of the following is correct about the atomic and ionic radii of the alkaline earth metals?

[A] it is smaller than corresponding alkali metals in the same periods
[B] it is larger than corresponding alkali metals in the same periods
[C] It is same as the corresponding alkali metals in the same periods
[D] None of the above

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27. What is the chemical name of Quick lime?

[A] Calcium peroxide
[B] Calcium oxide
[C] Calcium dioxide
[D] Calcium hydroxide

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28. What happens to the non-metallic character of elements in the p-block of the periodic table?

[A] non-metallic character decreases down the group
[B] non-metallic character increases down the group
[C] No fix pattern
[D] None

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29. What is the hemihydrate of calcium sulphate commonly known as?

[A] Gypsum
[B] Plaster of Paris
[C] Chloroform
[D] Limestone

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30. Which of the following is correct about Hydrazine?

[A] It is used in various rocket fuels
[B] Is chemical formula is N2 H2
[C] It is a blue colour liquid
[D] All of the above

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