Antiseptics and disinfectants either kil...

Antiseptics and disinfectants either kill or prevent growth of microorganisms. Identify which of the following statement is not true

dilute solutions of boric acid and hydrogen peroxide are strong antiseptics.

Disinfectants harm the living tissues.

A 0.2% solution of phenol is an antiseptic while 1% solution acts as a disinfectant.

Chlorine and iodine are used as strong disinfectants.

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Which of the following statements is not true ?

On passing `H_(2)S`, through acidified `K_(2)Cr_(2)O_(7)` solution, a milky colour is observed.

`Na_(2)Cr_(2)O_(7)` is preferred over `K_(2)Cr_(2)O_(7)` in volumetrie analysis

`K_(2)Cr_(2)O_(7)` solution in acidic medium is orange in colour.

`K_(2)Cr_(2)O_(7)` solution becomes yellow on increasing the `p^(H)` beyond 7.

Buna - S is a copolymer of butadiene and styrene.

Natural rubber is a1,4-polymer of isoprene.

In vulcanisation the formation of sulphur bridges between different chains makes rubber harder and stronger.

Natural rubber has trans configuration at every double bond.

on passing `H_(2)S`, through acidified `K_(2) Cr_(2) O_(7)` solution, a milky colour is observed

`Na_(2)Cr_(2)O_(2)` is preferred over `K_(2)Cr_(2)O_(7)` in volumetric analysis

`K_(2) Cr_(2) O_(7)` solution in acidic medium is orange in colour

`K_(2)Cr_(2)O_(7)` solution becomes yellow on increasing the `P^(H)` beyond 7