Arrange the following refractory materials in ascending order of their melting...

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Arrange the following refractory materials in ascending order of their melting points.
P. Alumina
Q. Silica
R. Carbon
S. Zirconia

A. R > P > Q > S

B. S > R > Q > P

C. R > S > P > Q

D. P > S > R > Q

Answer: Option A

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