General Science - Chemistry

51. What is the reason for the increase in the electronegativity across a period from left to right?
[A] attraction between the valence electrons and the nucleus increases
[B] attraction between the valence electrons and the nucleus decreases
[C] increase in the atomic weight
[D] None of the above

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52. In which of the following groups is Gold placed in the modern periodic table?
[A] 10
[B] 12
[C] 11
[D] 9

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53. 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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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 is the reason for different molecular arrangements as per VSEPR theory?
[A] To minimize mutual repulsion
[B] To minimize mutual attraction
[C] To minimize surface tension
[D] To have the minimum area

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56. In which of the following pairs is the repulsion greatest as per the VSEPR Theory?
[A] lone pair – lone pair
[B] lone pair – bond pair
[C] bond pair – bond pair
[D] Same for all

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57. What is the bond angle in case of Ammonia molecule?
[A] 120°
[B] 150°
[C] 66°
[D] 107°

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58. Which of the following represents the bond order in Molecular orbital theory?
[A] half the difference between the number of bonding and antibonding electrons
[B] twice the difference between the number of bonding and antibonding electrons
[C] the difference between the number of bonding and antibonding electrons
[D] the sum of the number of bonding and antibonding electrons

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59. Which of the following molecules have an electrovalent bonding?
[A] NaCl
[B] MgO
[C] NH3
[D] Both a and b

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60. What is the bond order in O2 molecule?
[A] 1
[B] 2
[C] 3
[D] 4

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