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A black metal oxide XO2 is used as a catalyst in the preparation of oxygen gas from potassium chlorate. The oxide XO2 is also used in ordinary dry cells. The metal oxide XOcannot be reduced satisfactorily with carbon to form metal X.   

(a) Name the metal X.

(b) Name the metal oxide XO2.

(c) Which reducing agent can be used to reduce XO2 to obtain metal X?

(d) Name another metal which can also be extracted by the reduction of its oxide with the above reducing agent.

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(a) Manganese

(b) Manganese dioxide

(c) Aluminium

(d) Chromium

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