Question

plzz gave me the answers of that true false 1 an element is a pure substance where as a compound is an unpure substance 2 carbon is a solid but when it reacts with hydrogen it forms the 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 ml or gl -1. 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 salt is obtained from seawater by the process of evaporation. 9 Bleaching powder is added to water to kill harmful bacteria. 10 physical changes reversible where is chemical change is Irreversible. plzz Answer all the questions I will mark u brainlist

Answer 1

1.true
2.true
3.false
4.true
5.false
6.true
7.false
8. True
9.true
10.true
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