Multiple choice

Which of the following statements about a solid substance 'mineral' is not correct?

  1. It is a chemical element.

  2. It is a compound found in nature.

  3. It has definite chemical composition.

  4. It occurs in crystalline form.

  5. It is very hard and never soft.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

There are both hard and soft minerals. Diamond is transparent and is the hardest substance known, whereas graphite is opaque and is nearly the softest substance known.

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