Quartz is__________________?
A. Stable form of silica upto 870°C
B. Converted to Tridymite on firing between 870 to 1470°C
C. Transformed to Cristobalite on heating above 1470°C
D. All A., B. and C.
Related Questions on Stoichiometry Mcqs for Chemical
A. Spalling resistance
B. Refractoriness
C. Refractoriness under load (RUL)
D. None of these
Refractoriness/fusion points of ‘Superduty’ refractories is _____________ °C?
A. 1520-1630
B. 1630-1670
C. > 1730
D. > 2000
With increase in the porosity, thermal spalling resistance of fireclay brick_______________?
A. Increases
B. Decreases
C. Remain same
D. May increase or decrease
A. Beryllia
B. Carborundum
C. Corundum
D. Thoria
A. Fireclay
B. Silicon carbide
C. Corundum
D. Siliceous fireclay