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A mixture of Na₂CO₃ and K₂CO₃ is used as fusion mixture because

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it has lower m.pt than Na₂CO₃ and converts metal salts to carbonates which decompose to metal oxides

it has lower melting point than both Na₂CO₃ and K₂CO₃ and converts the metal salts to carbonates, which decompose to metal oxides

it has higher melting point than both Na₂CO₃ and K₂CO³ and converts the metal salts to carbonates which decompose to metal oxide

it has higher m.pt than K₂CO₃ and converts metal salts to carbonates, which decompose to metal oxides

answer is C.

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It has lower than Na₂CO₃

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