Discussion
Assertion (A): Quantitative X-ray diffraction is sometimes preferred to the Bogue calculation.
Reason (R): Bogue assumes equilibrium and fixed phase compositions that a real clinker does not achieve.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. Bogue computes the phases from the oxide analysis on the assumption of equilibrium and pure phase compositions, neither of which a real clinker attains - the phases contain substituted ions and the cooling was not slow enough for equilibrium. Diffraction measures what is actually present, and the two figures can differ by several points.
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