Chemistry Questions Answers

• 50. Iodine can be separated from a mixture of Iodine and Potassium Chloride by ?
  

  1. Filtration
  2. Sublimation
  3. Distillation
  4. Sedimentation

  Answer And Explanation

  Answer: Option B

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• 51. The material which can be deformed permanently by heat and pressure is called a

  1. thermoset
  2. thermoplastic
  3. chemical compound
  4. polymer

  Answer And Explanation

  Answer: Option A

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• 52. Mass number of a nucleus is :

  1. the sum of the number of protons and neutrons present in the nucleus
  2. always more than the atomic weight
  3. always less than its atomic number
  4. None of above

  Answer And Explanation

  Answer: Option A

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• 53. Conduction band electrons have more mobility than holes because they are

  1. experience collision more frequently
  2. experience collision less frequently
  3. have negative charge
  4. need less energy to move them

  Answer And Explanation

  Answer: Option B

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• 54. Due to rusting the weight of iron

  1. Decreases
  2. Increases
  3. Remains the same
  4. Uncertain

  Answer And Explanation

  Answer: Option B

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• 55. Which gas is used to manufacture vanaspati from vegetable oil is

  1. carbon dioxide
  2. nitrogen
  3. oxygen
  4. hydrogen

  Answer And Explanation

  Answer: Option D

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• 56. The most electropositive elements among the following is :

  1. Cs
  2. Ca
  3. Na
  4. Br

  Answer And Explanation

  Answer: Option A

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