Q. Which of the following is not correct?
A) $SiO_{2}$is used as acidic flux
B) The distance between the layers in graphite is $3.35 \times 10^{- 3}$cm
C) $SiO_{2}$ reacts with $Na_{2}CO_{3}$ and liberates $CO$
D) The hybridisation of C in graphite is $sp^{2}$
Explanation
(c)
Silica reacts with metal carbonate forming silicate with the evolution of $CO_{2}$.
$Na_{2}CO_{3} + SiO_{2} \rightarrow Na_{2}SiO_{3} + CO_{2} \uparrow$
sodium silicate
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.