Which of the following is not an element? (A) Graphite (B) Germanium (C) Silica (D) Silicon

Answer: Among the above-mentioned options, it is (C) Silica that is not an element. In the first option, “Graphite” is an element of carbon. In the same manner “Germanium and Silicon” are also elements but the only remaining option of (C) Silica is not an element.