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

81. What is the general trend for electronegativity in a group of the periodic table as we move from top to bottom?

[A] It increases
[B] It decreases
[C] It remains constant
[D] None

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

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

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83. 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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84. Which of these species will have the largest atomic size?

[A] Na
[B] Mg
[C] Mg2+
[D] K

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85. What is the shape of XeF4 molecule?

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

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86. Choose the correct statement:

[A] Water exists as liquid due to hydrogen bonding
[B] Hydrogen bond is a weak bond as compared to ionic bond
[C] Both a and b
[D] None of the above

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87. 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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88. What is the bond angle in case of Ammonia molecule?

[A] 120°
[B] 150°
[C] 66°
[D] 107°

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89. What is the bond formed due to the electrostatic attraction known as?

[A] Covalent bond
[B] Electrovalent bond
[C] Electromagnetic bond
[D] Polar bond

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90. 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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