Chemistry Questions Answers

• 85. What is the chemical name of table salt ?

  1. Sodium nitrate
  2. Ammonium chloride
  3. Sodium chloride
  4. Calcium chloride

  Answer And Explanation

  Answer: Option C

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• 86. Why is phosphorus kept under water ?

  1. to make it wet
  2. to make it durable
  3. water forms a protective coating on it
  4. to save it from catching fire when exposed to dry air

  Answer And Explanation

  Answer: Option D

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• 87. What is extracted from Bauxite ?

  1. Mica
  2. Aluminium
  3. Copper
  4. Tin

  Answer And Explanation

  Answer: Option B

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• 88. Brass is an alloy of ?

  1. Copper and Tin
  2. Copper and Zinc
  3. Copper and Aluminium
  4. Iron and Copper

  Answer And Explanation

  Answer: Option B

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• 89. Contact lenses are made from ?

  1. Polyvinyl chloride
  2. Teflon
  3. Polystyrene
  4. Lucite

  Answer And Explanation

  Answer: Option A

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• 90. Which gas is filled in refrigerators ?

  1. Chlorofluorocarbon
  2. Acetylene
  3. Methane
  4. Butane

  Answer And Explanation

  Answer: Option A

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• 91. The single acid which dissolves gold is ?

  1. Aqua regia
  2. Hydrochloric acid
  3. Nitric acid
  4. Selenic acid

  Answer And Explanation

  Answer: Option A

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