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(D) The Solvay process is used for the manufacture of sodium carbonate $(Na_2CO_3)$.The key steps involve the reaction of brine ($NaCl$ solution) with

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$Na_2C_2O_4$

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(D) The Solvay process is used for the manufacture of sodium carbonate $(Na_2CO_3)$.The key steps involve the reaction of brine ($NaCl$ solution) with ammonia $(NH_3)$ and carbon dioxide $(CO_2)$ to form ammonium bicarbonate $(NH_4HCO_3)$ and sodium bicarbonate $(NaHCO_3)$.$NH_4HCO_3$ and $NaHCO_3$ are intermediates in this process.$Na_2C_2O_4$ (sodium oxalate) is not involved in the Solvay process.

Metals	Ore
$1$. Barium	$d$. Witherite
$2$. Magnesium	$a$. Carnallite
$3$. Potassium	$b$. Sylvine
$4$. Strontium	$c$. Celestine

The compound which is not associated with the Solvay ammonia process for the production of $Na_2CO_3$ is:

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