Which one of the following statements is...

Which one of the following statements is not true ?

Natural rubber has the trans- configuration at every double bond

Buna-S is a copolymer of butadiene and styrene

Natural rubber is a 1, 4-polymer of isoprene

In vulcanization, the formation of sulphur bridges between different chains make rubber harder and stronger

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Which one of the following statement is not true?

Oxidation state of oxygen can also be + 2

`H_2,O_2` acts as reducing agent towards `O_3`

Oxidation state of S in `S_8` is zero

The change of `PbO_2` to `Pb(NO_3)_2` is oxidation

Clean water would have a BOD value of less than 5 ppm

oxides of suphur nitrogen and carbon are the most widesperead ari [pollutant

ph of drinking water should be between 5.5-9.5

concentration of DO below 6 ppm is good for the growth of fish

Oxidation state of oxygen can also be + 2

`H_2O_2` acts as reducing agent towards `O_3`

Oxidation state of `S_8` is zero

The change of `PbO_2` to `Pb(NO_3)_2` Is oxidation