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JEE Main levelSingle correct optionDifficulty 2 of 3qa116

Assertion: A borax bead containing a manganese salt is violet (amethyst) in the oxidising flame. Reason: In the bead manganese is present as manganese(II) metaborate, a ion that absorbs visible light strongly.

  1. ABoth Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  2. BBoth Assertion and Reason are true but the Reason is not the correct explanation of the Assertion
  3. CAssertion is true but Reason is false
  4. DAssertion is false but Reason is true

Answer: C

In the oxidising flame manganese is oxidised and the violet bead owes its colour to manganese(III) metaborate, (a ion). Manganese(II) () borate is nearly colourless, which is what the reducing flame gives. The assertion is true, the reason is false.
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