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Q.

Which of the following will give the same colour in oxidising flame as well as in the reducing flame in borax bead test (when cold)?

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a

Cobalt

b

Chromium

c

Copper

d

Nickel

answer is A, C.

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Detailed Solution

In the borax bead test, chromium and cobalt will produce some colour in both the oxidising and reducing flames (when cold)

Hence correct option is a, c

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