Chemistry - 9 Chapter - 41Periodicity of Elements and Periodic TableTest - 18

Chemistry - 9 Chapter - 41
Periodicity of Elements and Periodic Table
Test - 18

1. What is an oxide? Short..Answer...............

a) Oxide is any compound containing oxygen, especially in combination with a metal.
b) Oxide is any compound containing hydrogen, especially in combination with a metal.

2. What is Halide? Short..Answer.........................................................
Halide is a chemical compound of a halogen with another element or group of atoms

a) Halide is a chemical compound of a halogen with another element or group of atoms
b) Halide is a chemical compound of a halogen with another element or group of molicules

3. Why atomic radius increases from top to bottom in a group? Short..Answer......................................................
Because with the increase of one period one more shell is added in the atoms of successive elements

a) Because with the increase of one period one more shell is added in the atoms of successive itoms
b) Because with the increase of one period one more shell is added in the atoms of successive elements

4. Why elements of group VII are called halogens? Short..Answer..................

a) Because they forms salt when they react with acids.
b) Because they forms salt when they react with metals.

5. Why group 1A and 2A is s- block ? Short..Answer......................

a) Because outer shell valence electrons of these elements are present in f-orbital
b) Because outer shell valence electrons of these elements are present in s-orbital

6. Why group 1A metals are called alkali metals"? Short..Answer....................

a) Because their oxides are readily soluble in acid.
b) Because their oxides are readily soluble in water.

7. Why the reactivity of group 1A metals increase down the group? Short..Answer.......................

a) Due to the increase in atomic size going up the group
b) Due to the increase in atomic size going down the group

8. ________ period is incomplete and contains _______ elements in modern periodic table.

a) Seventh, tewenty four
b) Nineth, tewenty four
c) Tewenty fourth, seven
d) Twenty fourth, nine

9. ___________ period of modern periodic table is smallest and _________ period is largest.

a) Nineth, one
b) Sixth, first
c) Seveneth, nineth
d) First, sixth

10. A period in modern periodic table indicates completion of shell.

a) True
b) False

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