Three allotropes (A), (B) and (C) of phosphorous in the following change are respectively :
$A 513 K - ---- \to 1200 a t m B 823 K - -------------------------------- \to I n a n i n e r t a t m . a n d t h e n r a p i d c o o l i n g t o r o o m t e m p C$

white, red, white

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black, white, red

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red, black, white

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red, violet, black

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Solution

The correct option is A white, red, white
$W h i t e P 513 K - ---- \to 1200 a t m R e d P 823 K - -------------------------------- \to I n a n i n e r t a t m . a n d t h e n r a p i d c o o l i n g t o r o o m t e m p W h i t e P$

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The elements of sets A , B and C are all colours as follows:

A = { Red , Orange , Yellow , Brown } ,

B = { Blue , Yellow , Green , Brown } ,

C = { Black , Brown , White , Grey }

Then, A U B U C is

β -

α -

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