A strong chemical substance which is used on objects and surfaces in our surroundings to kill germs is:

Carbolic Acid

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Cresol

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Iodine

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Mercurochrome

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Solution

The correct option is B
Cresol

The correct option is B.
Explanation for correct answer:
A chemical substance that is used to inhibit the growth and development of microorganisms is called an antiseptic or disinfectant.
Disinfectants destroy microorganisms which grow on nonliving surfaces and objects whereas antiseptics destroy microorganisms on living organisms.
Cresol is an example of disinfectant.
Thus, a strong chemical substance which is used on objects and surfaces in our surroundings to kill germs is cresol.

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