9th chemistry chapter 3 solved exercise MCQs

Periodic Table and Periodicity of Properties

9th chemistry chapter 3 solved exercise MCQs

  1. The atomic radii of elements in Periodic Table :

(a) increase from left to right in a period

(b) increase from top to bottom in a group

(c) do not change from left to right in a period

(d) decrease from top to bottom in a group

2. The amount of energy given out when an electron is added to an atom is called :

(a) lattice energy

(b) ionization energy

(c) electronegativity

(d) electron affinity

3. Mendeleev Periodic Table was based upon the :

(a) electronic configuration

(b) atomic mass

(c) atomic number

(d) completion of subshell

4. Long form of Periodic Table is constructed on the basis of :

(a) Mendeleev Postulate

(b) atomic number

(c) atomic mass

(d) mass number

5. 4th and 5th period of the long form of Periodic Table are called :

(a) short periods

(b) normal periods

(c) long periods ✔

(d) very long periods

6. Which one of the following halogen has lowest electronegativity ?

(a) fluorine

(b) chlorine

(c) bromine

(d) iodine ✔

7. Along the period, which one of the following decreases :

(a) atomic radius

(b) ionization energy

(c) electron affinity

(d) electronegativity

8. Transition elements are :

(a) all gases

(b) all metals

(c) all non-metals

(d) all metalloids

9. Mark the incorrect statement about ionization energy :

(a) it is measured in kj/mol

(b) it is absorption of energy

(c) it decreases in a period

(d) it decreases in a group

10. Point out the incorrect statement about electron affinity :

(a) it is measured in kj/mol

(b) it is absorption of energy

(c) it decreases in a period

(d) it decreases in a group

( Students If you have any Question , You can freely ask in Comment section )

9th Chemistry , Chapter 3, Periodic Table and Periodicity of Properties, solved exercise short questions ,free notes

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