Meena purchaseda paket of arhar dal from a store. For testing the presence of metanil yellow in dal she should use:

[a]NaCl [b]iodine solution [c]HCl [d]safranin

The correct option is (c).​ Dal is added to water along with few drops of conc. hydrochloric acid.
The appearance of pink colour confirms the presence of metanil yellow in dal (pulses)  

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