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Punjab (PTB) · Chapter test · Free

9th Class Chemistry Chapter 2 TestAtomic Structure

30 marks · 40 minutes · 21 questions. Covers: CHAP 2: Atomic Structure.

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9th Class Chemistry Chapter 2 Test

9th Class · Chemistry · Punjab (PTB)

Name: ____________Roll No: ________Class/Section: ________Date: ________Total marks: 30Time: 40 minutes

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

  1. Atomic mass of Sulphur is:

    1. 31.972 amu

    2. 31.92 g

    3. 31.92 kg

    4. All of these

  2. Relative atomic mass of krypton:

    1. 12.0

    2. 57.3

    3. 17.8

    4. 83.7

  3. Bohr's atomic model was proposed in:

    1. 1900

    2. 1903

    3. 1913

    4. 1813

  4. In which isotope of oxygen there are the equal number of protons, electrons and neutrons?

    1. 17O

    2. 16O

    3. 18O

    4. None of these

  5. Which isotope is used for diagnosis of goiter?

    1. Iodine -131

    2. Cobalt-60

    3. P-32

    4. Sr-90

  6. Isotope of an element shows:

    1. Similar physical properties

    2. Different chemical properties

    3. Both a and b

    4. None of these

  7. Which subshell is present in L-shell

    1. s&p

    2. Only s-subshell

    3. Only p-subshell

    4. Subshells

  8. Which isotope is used to nuclear reactors?

    1. U-234

    2. U-238

    3. U-235

    4. All of these

  9. Central protons of the atom is called as:

    1. Head

    2. Nucleus

    3. Extra

    4. None of these

  10. When was neutron was discovered?

    1. 1912

    2. 1923

    3. 1933

    4. 1943

Q2. Short questions (Attempt any 6 of 8 · 6 × 2 = 12)

  1. Give an example of a radioactive isotope which disintegrates to give a stable atom. 

  2. How many atoms does our body replace every year?

  3. During discharge tube experiments, how did the scientists conclude that the same type of electrons and protons are present in all the elements?

  4. Calculate the relative atomic mass of Krypton, Isotopic abundances of isotopes 2.0,12.0,12.0,57.0 and 57.0 are 80,82,83,84,85 respectively.

  5. Calculate the number of neutrons, protons and electrons in barium.

  6. What is meant by carbon dating or radio carbon dating?

  7. How can an atom absorb and evolve energy?

  8. Define atomic mass unit. (amu).

Q3. Long questions (Attempt any 2 of 3 · 2 × 4 = 8)

  1. Write detailed note about atomic number and mass number.

  2. Find out the relative atomic mass of mercury from the following data.

    Isotope            Relative Abundance        Isotope            Relative Abundance

    196Hg         =   0.0146%                          199Hg         =  16.34%

    196Hg         =   10.02%                             200Hg        =    23.13%

    201Hg         =    13.22%                             202Hg       =     29.80%

    204Hg        =     6.85%

  3. What is radioactivity? Explain any three applications of radioactive isotopes.