Assertion: Copper obtained after bessemerisation is known as blister-copper. Reason: Blisters are produced on the surface of the metal due to escaping of sulphur dioxide gas during cooling.

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If both Assertion and Reason are CORRECT and Reason is the CORRECT explanation of the Assertion. Explanation: After Bessemerisation, the copper obtained is called blister copper (about 98–99% pure). During cooling, sulphur dioxide (SO2) gas escapes from the molten metal, producing blisters on its surface. Hence, the copper is known as blister copper, and the reason correctly explains the assertion.

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