Question

which of the following is a mixture?
common salt
copper
sulphur
hydrogen​

Answer 1

Answer:

COMMON SALT

FORMULA OF COMMON SALT IS NaCl

sodium chloride

there is a combination of two pure substances

so it is a mixture or impure substances

Answer 2

• Ordinary table salt is called sodium chloride. It is considered a pure substance because it has a uniform and definite composition. All samples of sodium chloride are chemically identical.
• Elemental Copper is a mixture of two stable isotopes: approximately 70% copper atoms of mass number 63 and 30% of mass number 65. They both have 29 protons ...
•Sulphur is a element. It is not mixture or compound because sulfer is a single element /atom not contain more than one atoms .so it is element.
•Hydrogen is a chemical element. It has the symbol H and atomic number 1. It has a standard atomic weight of 1.008, meaning it is the lightest element in the periodic table. Hydrogen's most common isotope has one proton with one electron orbiting around it.

Hope this will help you:)