Assertion: When copper fillings are heated strongly in an open china dish, the copper fillings becomes black.
Reason: The oxidation of copper metal takes place to form copper oxide.(a) Both A and R are true, and R is correct explanation of the assertion.
(b) Both A and R are true, but R is not the correct explanation of the assertion.
(c) A is true, but R is false.
(d) A is false, but R is true.
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Answer:
a) both A and R are true,and R is correct explanation
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