The most common constituents of alkalinity in natural water are measured by titrating the water sample with $0.02 N H_{2} S O_{4}$ using

Methyl Orange and Eriochrome Black T indicators

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Ferroin and Phenolphthalein indicators

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Eriochrome Black T and Ferroin indicators

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Phenolphthalein and Methyl Orange indicators

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Solution

The correct option is D Phenolphthalein and Methyl Orange indicators
$(c) Alkalinity in natural water is measured$ $by titrating the water sample with 0.02 N$ $H_{2} S O_{4} using phenolphthalein and methyl$ $orange indicators.$

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H_{2} S O_{4}

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\begin{matrix} Groups - I & Groups - II P. Alkalinity & 1. N / 35.5 A g N O_{3} Q. Hardness & 2. N / 40 N a_{2} S_{2} O_{3} R. Chloride & 3. H_{2} S O_{4} S. Dissolved oxygen & 4. N / 50 E D T A \end{matrix}

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