Chemistry - 9 Chapter - 4Periodicity of Elements and Periodic TableTest - 17

Chemistry - 9 Chapter - 4
Periodicity of Elements and Periodic Table
Test - 17

1. Metals of group 1A react vigorously with water producing Oxygen.

a) True
b) False

2. Noble gases were easily fitted before group one because their atomic mass was ______?

a) Less than group eight elements
b) Less than group one elements
c) More than group one elements
d) All are correct

3. Physical properties of elements in groups follow irregular pattern.

a) False
b) True

4. Reactivity of halogens gradually decreases down the group.

a) True
b) False

5. Sodium is a highly reactive metal, which readily reacts with air at room temperature. Element of which group may be mixed with it for its safe storage?

a) Group five
b) Group one
c) Group zero
d) Group two

6. The number of elements present in zero group is:

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

7. Two Valencies of group fifth and sixth elements are due to? Short..Answer…………………………………..
One being equal to group number and second being difference of group number from eighth

a) One being equal to group number and second being difference of group number from eighth
b) I will memorise the answer before six

8. Two Valencies of group five elements will be________?

a) 5 only
b) 13 only
c) 5 and 8 - 5 = 3

9. Valencies of group sixth element will be?

a) Six and three
b) Six and eight
c) Six and two
d) Six and four

10. What is Alkali? Short..Answer....................................................
A chemical substance that is soluble in water, neutralizes acids, forms salts with them and turns red litmus paper -------.

a) blue
b) red

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