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

51. Which of these methods can be used to prevent rancidity?

[A] Adding antioxidants to the food
[B] Storing food at low temperature
[C] Replace the air with nitrogen in the packing material
[D] All of the above

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52. Which of the following is correct about Mendeleev’s Periodic Table?

[A] Argon is placed before Potassium
[B] Cobalt is placed before Nickel
[C] Tellurium is placed before iodine
[D] All of the above

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53. Choose the correct statement about the modern periodic table:

[A] Elements in any one group contain the same number of valence electrons
[B] Elements in any one period contain the same number of shells
[C] Both a and b
[D] None

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54. Which of the following is true about a water molecule?

[A] It has a bent-shaped structure
[B] The bond angle is 120°
[C] It is a non-polar solvent
[D] All of the above

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

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

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56. Which of the following hydrogen bond is formed in the case of o-nitrophenol?

[A] Intramolecular
[B] Intermolecular
[C] Both a and b
[D] None

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57. What is the relationship between bond energy and bond length?

[A] Bond energy is independent of bond length
[B] Bond energy increases with the increase of bond length
[C] Bond energy decreases with the increase of bond length
[D] None of the above

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58. What is the length of O-O double bond in an ozone molecule?

[A] 121 pm
[B] 148 pm
[C] 143 pm
[D] 123 pm

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59. What is the dipole moment in BF3 molecule?

[A] 0
[B] 1
[C] 1.85
[D] 6.22

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60. What is the shape of SF4 molecule?

[A] Bent
[B] See-saw
[C] Trigonol Pyramidal
[D] T-shape

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