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

71. When does a saturated hydrocarbon gives a sooty flame on burning?

[A] When the supply of oxygen is limited
[B] When the supply of oxygen is full
[C] A saturated hydrocarbon never gives a sooty flame on burning
[D] None of the above

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72. Which of the following represents the mixture of carbon monoxide and nitrogen?

[A] Coal tar
[B] Producer gas
[C] Water gas
[D] All of the above

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73. What is the H-C-H bond angle in a methane molecule?

[A] 120°
[B] 75°
[C] 109.5°
[D] 150°

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74. Which of these is a Thermoplastic polymer?

[A] Terylene
[B] Polythene
[C] PVC
[D] All of the above

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75. Which of the following polymer is obtained by the condensation reaction between ethylene glycol and terephthalic acid?

[A] Terelene
[B] PMMC
[C] PVC
[D] None of the above

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76. Which of these is a biodegradable polymer?

[A] PLA
[B] PCL
[C] PGA
[D] All of the above

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77. Which of the following metal is the key component of Vitamin B12?

[A] Iron
[B] Zinc
[C] Copper
[D] Cobalt

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78. Which of the following metals can easily be cut with a knife?

[A] Sodium
[B] Manganese
[C] Zinc
[D] Tin

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79. Which of these metals is commonly used in tanning of leather?

[A] Phosphorous
[B] Indium
[C] Manganese
[D] Chromium

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80. What are the structures formed by the soap molecules, during cleansing, known as?

[A] Stereates
[B] Esters
[C] Micelles
[D] Tubes

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