Write the chemical composition of cryolite.
Solution and Explanation
Answer:
Na3AlF6 (Sodium hexafluoroaluminate)
Explanation:
Cryolite is a double fluoride of sodium and aluminium, having the chemical formula Na3AlF6.
It is used as a solvent for alumina (Al2O3) in the Hall–Héroult process for the extraction of aluminium, as it lowers the melting point and increases conductivity of the electrolyte.
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1 M aqueous solution of each of $ Cu(NO_3)_2 $, $ AgNO_3 $, $ Hg_2(NO_3)_2 $; $ Mg(NO_3)_2 $ are electrolysed using inert electrodes, Given : $ E^0_{Ag^+/Ag} = 0.80V $, $ E^0_{Hg_2^{2+}/Hg} = 0.79V $, $ E^0_{Cu^{2+}/Cu} = 0.34V $ and $ E^0_{Mg^{2+}/Mg} = -2.37V $
Statement (I) : With increasing voltage, the sequence of deposition of metals on the cathode will be Ag, Hg and Cu
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Given: $ E^\circ_{\text{Cu}^{2+}/\text{Cu}} = 0.34 \, \text{V} $ $ E^\circ_{\text{Ag}^+/ \text{Ag}} = 0.8 \, \text{V} $ $ \frac{2.303RT}{F} = 0.06 \, \text{V} $- JEE Main - 2025
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