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question_answer1) The most abundant element on earth's crust is
question_answer2) Which metal is used as a reducing agent in smelting
question_answer3) Which of the following is not found in free state?
question_answer4) Among the following groups of oxides, the group that cannot be reduced by carbon to give the respective metals is
question_answer5) Fe and Zn are distinguished by
question_answer6) Which of the following reacts most vigorously with water?
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