Question

which of the following given is correct give explanations ​

Answer 1

option 1),2) and 4) are correct

Answer 2

1.)  If a substance contains more than one type of atom, it is a compound. So, No, an element of a substance may or may not contain only one kind of atoms.

2.)  Mass of carbon = 12

     Mass of O₂ = 32

      Mass ratio = 12/32 = 3/8

3.) Compounds are pure substances that are made up of more than one type of atom and can be broken down or decomposed into its individual elements by chemical methods, but cannot be separated by physical methods.

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