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

41. Which of the following are the limitations of Bohr’s model of atom?

[A] it cannot explain spectrum of atoms containing more than one electron
[B] it cannot explain the Zeeman effect
[C] it cannot explain the Stark effect
[D] All of the above

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42. What is the general Q-value for alpha-decay?

[A] greater than 0
[B] less than 0
[C] equal to 0
[D] None of the above

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43. What is the S.I unit of activity?

[A] becquerel
[B] curie
[C] candela
[D] henry

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44. Which of the following substance was used as a moderator in CIRUS reactor?

[A] Heavy water
[B] water
[C] solid graphite
[D] No moderator was used

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45. What do we call the reactions in which there is an exchange of ions between the reactants?

[A] Double Displacement reaction
[B] Decomposition reaction
[C] Displacement reaction
[D] Combination reaction

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46. Upto which element the Law of Octaves was found to be applicable?

[A] Carbon
[B] Calcium
[C] Iron
[D] Copper

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47. Which of the following is a part of chalcogen group of the modern periodic table?

[A] Boron
[B] Tin
[C] Lead
[D] Oxygen

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48. Which of the following elements has the largest atomic radii?

[A] Lithium
[B] Beryllium
[C] Boron
[D] Carbon

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49. Choose the correct order in terms of Metallic character of these elements?

[A] Na> Mg >Be > P
[B] Mg >Be > P > Na
[C] Be> Mg > P > Na
[D] P> Be >Mg > Na

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50. What is the shape of XeF4 molecule?

[A] T-shaped
[B] Bent
[C] See-saw
[D] Square planar

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