A water sample has ppm level concentration of following anions, F - = 10 ; S O 4 2 - = 100 ; N O 3 - = 50 . The anion/anions that make/makes the water sample unsuitable for drinking is/are

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Above 500 ppm of S O 4 2 - ions in drinking water, can cause laxative effect otherwise lesser ppm value is permissible for drinking. Maximum limit of N O 3 - ions in drinking water is 50 ppm, above this limit it can cause the disease like methemoglobinemia. More than 1 ppm F - ions in drinking water are not fit for drinking, it can cause decay of bones and teeth.