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

  • 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

  • 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

  • 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

  • 54. Due to rusting the weight of iron

    1. Decreases
    2. Increases
    3. Remains the same
    4. Uncertain
    Answer And Explanation

    Answer: Option B

  • 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

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

    1. Cs
    2. Ca
    3. Na
    4. Br
    Answer And Explanation

    Answer: Option A