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Using the powder method of diffractometers, which of the following can be determined?

(a) Percentage of K+

(b) Percentage of Na+ and Cl-

(c) Percentage of KBr and NaCl

(d) Percentage of Br-

The question was asked in a national level competition.

This interesting question is from X-Ray Diffractometers in chapter X-Ray Spectrometers of Analytical Instrumentation

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The correct choice is (c) Percentage of KBr and NaCl

Easiest explanation: Using the powder method of diffractometers, percentage of KBr and NaCl can be determined. Other analytical methods provide the only percentage of K+, Na+, Cl- and Br-.

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