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JEE Main levelSingle correct optionDifficulty 2 of 3qa046

Assertion: In the brown ring test, conc. is poured slowly along the wall of the tube. Reason: Conc. is denser than the aqueous mixture, so it forms a separate lower layer and the complex forms at the junction.

  1. ABoth the assertion and the reason are true, and the reason explains the assertion
  2. BBoth the assertion and the reason are true, but the reason does not explain the assertion
  3. CThe assertion is true but the reason is false
  4. DThe assertion is false but the reason is true

Answer: A

Slow pouring prevents mixing and local heating, which would destroy the unstable . Because the acid is denser it settles below the aqueous layer, so the ring appears exactly at the junction. The reason explains the assertion.
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More questions on Concentrated acid group: halides, nitrate, oxalate