Question

correct the statement if it is wrong
a) indicators show different colours in acidic and basic situations.
b) sodium hydroxide turns blue litmus red.
c) tooth decay is caused by the presence of base in water.
scert telangana 7th Class
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Answer 1

Answer: A- is correct, B- is false correct statement -sodium hydroxide turn red litmus blue C- tooth decay is caused by acid

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Answer 2

option c is in correct as tooth decay starts when ph of mouth is less than 5 .6