The alkalinity and the hardness of a water sample are 250 mg/L and 350 mg/L as $C a C O_{3}$ , respectively. The water has

250 mg/L carbonate hardness and 350 mg/L non-carbonate hardness

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250 mg/L carbonate hardness and 100 mg/L non-carbonate hardness

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250 mg/L carbonate hardness and zero non-carbonate hardness

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350 mg/L carbonate hardness and zero non-carbonate hardness

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Solution

The correct option is B 250 mg/L carbonate hardness and 100 mg/L non-carbonate hardness
$A l k a l i n i t y = 250 m g / L a s C a C O_{3}$

Total hardness = 350 mg/L

Carbonate hardness = minimum of Alkalinity & total hardness

$= 250 m g / L a s C a C O_{3}$

Non-Carbonate hardness
$= 100 m g / L a s C a C O_{3}$

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