Q55 · CSIR-NET Chemistry, June 2013

Paper: CSIR-NET June 2013 · Subject: Inorganic Chemistry · Chapter: Main Group Elements · Topic: Main Group Elements – General · Marks: 2 · Difficulty: Easy

The correct equilibrium order for the interconversion of different forms of $\mathrm{SiO}_{2}$ is
(a)Tridymite $\rightleftharpoons$ quartz $\rightleftharpoons$ cristobalite $\rightleftharpoons$ liquid $\mathrm{SiO_2}$
(b)quartz $\rightleftharpoons$ Tridymite $\rightleftharpoons$ cristobalite $\rightleftharpoons$ liquid $\mathrm{SiO_2}$
(c)quartz $\rightleftharpoons$ cristobalite $\rightleftharpoons$ tridymite $\rightleftharpoons$ liquid $\mathrm{SiO_2}$
(d)cristobalite $\rightleftharpoons$ tridymite $\rightleftharpoons$ quartz $\rightleftharpoons$ liquid $\mathrm{SiO_2}$
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
With rising temperature: α-quartz → β-quartz (573 °C) → tridymite (870 °C) → cristobalite (1470 °C) → liquid (1710 °C).

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