Which of the following is not correct?
- A$SiO_2$ is used as an acid flux.
- BThe distance between the layers in graphite is $3.35 \times 10^{-8} \ cm$.
- C$SiO_2$ reacts with $Na_2CO_3$ and liberates $CO_2$.
- DThe hybridisation of $C$ in graphite is $sp^2$.
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