Advertisements
Advertisements
प्रश्न
Select the correct answer to the statement given below:
An element present in the earth’s crust, atmosphere and the human body.
विकल्प
Chalk
Oxygen
Silicon
Bromine
Nitrous oxide
उत्तर
Oxygen
APPEARS IN
संबंधित प्रश्न
What is the significance of the symbol of an element ? Explain with the help of an example.
What do the following symbol stand for?
H
Match the symbols of metallic elements – with their correct combining power or capacity.
(a) K
(b) Zn
(c) Al
(d) Na
(e) Ca
Combining power or capacity – A : 3 ; B : 2 ; C : 1. (positive valencies)
Give the symbol of the following element:
Calcium
Give the symbol of the following element:
Aluminium
State what is meant by the term ‘activity series of metals’.
Write the radical of the following valency:
Phosphate
Give the formula of the following gas:
Nitrous oxide
State whether the following ion or radical given below of a non-metallic element exhibits valency: 1–, 2– or 3–. (write the ion or radical with the correct valency).
Zincate
Write the constituent elements and their symbols for the following compounds.
- Carbon monoxide
- Washing soda
