Advertisements
Advertisements
प्रश्न
Oxygen is very essential for us to live. It forms 21% of air by volume. Is it an element or compound?
Advertisements
उत्तर
Oxygen is an element. It contains the atoms of oxygen of the same kind.
APPEARS IN
संबंधित प्रश्न
Tick the most appropriate answer
Solutions are
- heterogeneous mixtures.
- compounds
- homogeneous mixtures.
- elements
Give one example for the following types of mixtures :
misicible liquids
What are the advantages of chromatography?
Give one use of the following substance:
Coal
Tick (√) the correct alternative from the choice given for the following statement.
Sand is a compound of
Elements are classified into – Metals – Non-metals – Metalloids – Noble gases. State which of A, B, C, D is a –
1. Metallic element
2. Non-metallic element
3. Metalloid
4. Noble gas.
A: Is non-malleable, non-ductile & a poor conductor of electricity ___________
B: Has lustre, is malleable and ductile & a good conductor of heat ___________
C: Is unreactive and inert and present in traces in the air _________
D: Shows properties of both metals and non-metals ___________
Select the correct answer from the choice given below.
The unreactive non-metallic element
Write the names of elements from the following symbol:
Br
Elements are broadly classified into metals and non-metals. State six general differences in the physical properties of metals and non-metals. State two metals and two non-metals which contradict with the general physical properties – giving reasons. State one difference in property between metalloids and noble gases.
Select the correct answer from A, B, C, D & E for the statement given below :
A metalloid.
