Question

B. WRITE-TRUE OR FALSE:
1 MARK EACH
1. An element is a pure substance whereas a compound is an impure substance. Lue
2. Carbon is a solid but when it reacts with hydrogen, it forms a compound which is gaseous in
state.
3. It is not necessary that a pure substance has a fixed or constant melting or boiling point
4. Concentration of a gas can also be measured.
5. Solubility is expressed in mt or gl.
6. In colloidal solution, particles do not dissolve but settle down in the solvent
7. Components of air cannot be separated as they are mixed properly.
8. Common sait is obtained from sea-water by the process of evaporation
9. Bleaching powder is added to water to kill harmful bacteria.
10. Physical change is reversible whereas chemical change is irreversible​

Answer 1

Answer:

HERE GO YOUR ANSWERS -

1. FALSE
2. FALSE
3. TRUE (IT CAN CHANGE ACCORDING TO PRESSURE AND TEMPERATURE)
4. TRUE
5. FALSE
6. TRUE
7. FALSE
8. TRUE
9. TRUE
10. FALSE

I AM ALSO IN 9TH :-)

IF THESE HELPED YOU THEN PLEASE MARK AS BRAINLIEST

Answer 2

Answer:

1) false 2) false 3)true 4) true 5)false 6) true 7)

Explanation:

false 8) true 9) true 10) false