Chemistry - 9 Chapter - 4Periodicity of Elements and Periodic TableTest - 7

Chemistry - 9 Chapter - 4
Periodicity of Elements and Periodic Table
Test - 7

1. 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) chemical
b) apparent
c) physical

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

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

4. What is penultimate?

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

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

6. 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) total
b) difference
c) average

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

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

9. Dobereiner was a ______.
a) British
b) German
c) American
d) Indian

10. Elements with similar properties were grouped in "Triads" by ?

a) Lother Meyer
b) Newland
c) Mendeleef
d) Dobereiner

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