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 the following quantum numbers is represented by a period of the modern periodic table?

[A] Principal quantum number
[B] Azimuthal quantum number
[C] Magnetic quantum number
[D] None of the above

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52. The Lanthanoids are part of which of the following block of elements in the periodic table?

[A] p-block
[B] s-block
[C] d-block
[D] f-block

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53. Which is the first element in the Actinoid series?

[A] Actinium
[B] Bohrium
[C] Mendelevium
[D] Nobelium

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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 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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56. What is the dipole moment in BF3 molecule?

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

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57. What is the molecular geometry of a Methane molecule?

[A] Linear
[B] Trigonol Planar
[C] Tetrahedral
[D] Trigonol bipyramidal

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58. Choose the correct statement about Litmus solution:

[A] Its colour is brown
[B] It is slightly acidic in nature
[C] It is extracted from lichen
[D] All of the above

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59. Choose the incorrect acid-source pair?

[A] Citric acid – Lemon
[B] Lactic acid – Sour milk
[C] Oxalic acid – Ant sting
[D] Methanoic acid – Nettle sting

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60. What do we call the number of water molecules present in one formula unit of a salt?

[A] Formula number of salt
[B] Power of the salt
[C] Water of crystallisation
[D] Hydro number

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