Discussion
Assertion (A): Potash feldspar is generally preferred to soda feldspar in whiteware bodies.
Reason (R): Its melt is more viscous, so the body has a wider firing range before it deforms.
Answer: C
Both are true and the reason gives the practical advantage: a kiln cannot hold every piece at exactly the same temperature, so a body that tolerates a spread of twenty or thirty degrees is far easier to fire successfully.
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