Chemistry - 9 Chapter - 4Periodicity of Elements and Periodic TableTest - 1

Chemistry - 9 Chapter - 4
Periodicity of Elements and Periodic Table
Test - 1

1. A periodic table was first prepared on the basis of ________ in ascending order.

a) Isotopes
b) Atomic numbers
c) Atomic masses

2. Allah has created this universe from some basic units called _________?

a) Elements
b) Isotopes
c) Compounds
d) Atoms

3. How elements were grouped in the beginning? Short..Answer.........................................................
They were grouped on the basis of their ______states at ordinary temperature as solid, liquid and gas and also as metals and non-meals.

a) physical
b) chemical
c) apparent

4. In beginning efforts were made to group the elements on the basis of
______?
a) Their atomic number
b) Their chemical state
c) Their physical state
d) Their atomic masses

5. Water covers _________?
a) Three by five of earth
b) Two by four earth
c) Three by four of earth

6. What is penultimate?

a) Next inner shell to the innermost shell (orbit) of an atom.
b) Next outer shell to the innermost shell (orbit) of an atom.
c) Next inner shell to the outermost shell (orbit) of an atom.
d) Next outer shell to the outermost shell (orbit) of an atom.

7. Why elements were grouped in the shape of periodic table? ( Pick the wrong statement )
a) Due to increase in the number of elements
b) periodic table all elements are arranged in various groups in orderly and natural manners
c) comparative study became difficult due to increase in the number
d) periodic table all elements are arranged in various groups in natural manners only
e) periodic table made their study easy and enabled scientists to understand there properties.

8. Define Doberiener's Law of triads?
In 1829, German chemist Dobereiner arranged similar elements in sets of three, called triads. Atomic mass of the middle atom of a triad was equal to the ______of atomic masses of first and third element.
a) average
b) difference
c) total

9. Dobereiner classified elements in groups of three on the basis of their____________.
a) Atomic numbers
b) Physical state
c) Chemical state
d) Atomic masses

10. Dobereiner grouped elements in Triads in ________.
a) 1982
b) 1892
c) 1896
d) 1829

This is more feedback!

This is the feedback!