Which of the following statements is not corr | vedclass

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(D) Calcination is a process of heating an ore strongly in a limited supply of air or in the absence of air. $1$. Carbonate ores are converted into th

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Lower oxidation state oxides are oxidised further

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(D) Calcination is a process of heating an ore strongly in a limited supply of air or in the absence of air. $1$. Carbonate ores are converted into their oxides (e.g.,$ZnCO_3 \rightarrow ZnO + CO_2$). $2$. The temperature is kept below the melting point of the metal to prevent fusion. $3$. Volatile impurities are removed. $4$. Calcination does not involve the oxidation of lower oxidation state oxides to higher oxidation states; this is characteristic of roasting,where excess air is used. Therefore,the statement that 'Lower oxidation state oxides are oxidised further' is incorrect regarding calcination.

Which of the following statements is not correct regarding calcination?

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