Chemistry - 9 Chapter - 4Periodicity of Elements and Periodic TableTest - 29

Chemistry - 9 Chapter - 4
Periodicity of Elements and Periodic Table
Test - 29

1. Gallium was discovered in _________?

a) 1785
b) 1857
c) 1578
d) 1875

2. In 1829, German chemist Dobereiner arranged similar elements in sets of three, called triads on the bases of their atomic numbers?

a) True
b) False

3. In Mendeleef,s table each seventh element occurs below first element.

a) False
b) True

4. In Mendeleef's table elements were arranged in the ________ of their atomic masses?

a) Random order
b) Decreasing order
c) Increasing order
d) Mixed order

5. In the beginning elements were grouped based on their physical state and as salts and non-salts?

a) True
b) False

6. in the modern periodic table metals are present on the left side of metalloids.

a) True
b) False

7. Law of octaves is also called Newlands octaves?

a) False
b) True

8. Li, Na, K, Rb and Cs are

a) Alkali metals
b) Alkaline non metals
c) Alkaline earth metals
d) Acidic metals

9. Mendeleef periodic law was never modified?

a) No
b) Yes

10. Mendeleef periodic table contained ____________ groups.

a) Eighteen
b) Eight
c) Nine
d) Seven

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