Question

4. Which of these metals is a pure element? Brass Bronze Silver Steel 5. C is the correct chemical symbol for ....... Calcium Carbon Chlorine Cobalt 6. Which of these substances is an element? Air Fire Oxygen Water

Answer 1

4) Silver

5) Carbon

6) Oxygen

Answer 2

4) Silver (Rest are alloys)

5) Carbon (It stands for C)

6) Oxygen (Rest of them are either compounds or mixtures)