Chemistry Questions Answers

  • 1. 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 :

    Option B

  • 2. Which one is an organic Acid ?

    1. Sulphuric
    2. Citric
    3. Nitric
    4. Phosphoric
    Answer :

    Option B

  • 3. Identify the wrong statement in the following

    1. Atomic radius of the elements increases as one moves down the first group of the periodic table
    2. Atomic radius of the elements decreases as one moves across from left to right in the 2nd period of the
    3. Amongst isoelectronic species, smaller the positive charge on the cation, smaller is the ionic radius
    4. Amongst isoelectronic species, greater the negative charge on the anion, larger is the ionic radius
    Answer :

    Option C

  • 4. Bleaching action of chlorine is by

    1. decomposition
    2. hydrolysis
    3. reduction
    4. oxidation
    Answer :

    Option A

  • 5. Atomic number of an element gives

    1. the number of nucleons in its atom
    2. the number of electrons in its atom
    3. the weight of the atom of the element
    4. the total number of elementary particles in its atom
    Answer :

    Option B

  • 6. Human bone does not contain

    1. calcium
    2. carbon
    3. oxygen
    4. phosphorous
    Answer :

    Option C

    Explanation:

    Human bone contains calcium, carbon, phosphorous.

  • 7. Water drops are spherical because of ?

    1. viscosity
    2. density
    3. polarity
    4. surface tension
    Answer :

    Option D