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

31. What do the dots represent in the Lewis dot structures?

[A] positrons
[B] electrons
[C] atoms
[D] neutrons

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32. What do we call the amount of energy required to break one mole of bonds of a particular type between two atoms in a gaseous state?

[A] Ionisation Potential
[B] Bond Enthalpy
[C] Electron affinity
[D] Bond order

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33. What is meant by Bond length of two bonded atoms in a molecule?

[A] equilibrium distance between their valence electrons
[B] equilibrium distance between their outermost shell
[C] equilibrium distance between their nuclei
[D] twice the distance between their valence electrons

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34. Which of the following is correct about Ionic compounds?

[A] They have high melting and boiling points
[B] They are soluble in non-polar solvents
[C] They are usually gases in nature
[D] All of the above

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35. What are the by-products of a hydrogen fuel cell?

[A] Water, heat and ozone
[B] Water and heat
[C] Water and ozone
[D] Heat, methane and Carbon dioxide

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36. What percent of Carbon is present in the earth’s crust?

[A] 10%
[B] 76%
[C] 0.18%
[D] 38.2%

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37. What do we call the compounds formed by the linking of carbon by single bonds in between them?

[A] Saturated compounds
[B] Unsaturated compounds
[C] Monovalent compounds
[D] Ionic compounds

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38. Which of these is a Thermoplastic polymer?

[A] Terylene
[B] Polythene
[C] PVC
[D] All of the above

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39. Which of these non-metals is lustrous?

[A] iodine
[B] selenium
[C] phosphorous
[D] All of the above

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40. Which of the following is the method to get rid of temporary hardness of water?

[A] Boiling the water
[B] Addition of calcium hydroxide
[C] Both a and b
[D] None

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