Same substances can act as an antiseptic as well as disinfectant by 1 Varying its concentration...........

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Same substances can act as an antiseptic as well as disinfectant by

1.Varying its concentration

2.Using it on inanimate surfaces instead of animate biological surfaces

Which of the above is/are correct ?

1 only

2 only

Both 1 and 2

None

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Explanation:

Disinfectants are applied to inanimate objects such as floors, drainage system, instruments, etc. Same substances can act as an antiseptic as well as disinfectant by varying the concentration.
For example, 0.2 per cent solution of phenol is an antiseptic while its one percent solution is disinfectant. Chlorine in the concentration of 0.2 to 0.4 ppm in aqueous solution and sulphur dioxide in very low concentrations, are disinfectants. So, 1 is correct.
The surface, animate or inanimate, does not cause this difference. So, 2 is incorrect.