A) \[NaOH\] is used in the concentration of bauxite ore
B) \[NaOH\] is a primary standard in volumetric analysis
C) Manganous hydroxide is soluble in excess of \[NaOH\]solution
D) \[NaOH\] solution does not react with \[Cl\]
Correct Answer: A
Solution :
\[NaOH\] is used in the concentration of bauxite ore.
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