The indicator which is used to find the strength of caustic soda solution with the help of oxalic acid is:

Methyl orange

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Phenolphthalein

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Potassium permanganate

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None of the above

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Solution

The correct option is B Phenolphthalein
An indicator is a chemical substance that undergoes a colour change at the endpoint. The endpoint of an acid-base titration can be determined using acid-base indicators. Acid Base indicators are either weak organic acids or weak organic bases. The colour change of an indicator depends on the pH of the medium. The un-ionized form of an indicator has one colour, but its ionized form has a different colour
Phenolphthalein is used to find the strength of caustic soda solution with the help of oxalic acid

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Q54) Consider the following statements

i) Iodine solution is used to test the presence of fat.

ii) Vitamins have no nutritive value, but provide protection against disease.

iii) Mixture of copper sulphate and caustic soda is used to test the presence of proteins.

Which of the above statements are true?

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