Question

1.
Which of the following is an element ?
1) Ozone
3) German silver
2) Silica
4)Methane
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Answer 1

Answer:

Ozone is an element..........

Answer 2

Answer:

Silica is a element .

Explanation:

Silicon dioxide is known as silica with molecular formula =SiO2

which is a compound, not an element.

Diamond and graphite are purely made up of carbon i.e C, an element.

Ozone is trioxygen molecule i.e O3 , an element.

Hence, the answer is option C.