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Melting point of a mixture of \( \mathrm{Na}_{2} \mathrm{CO}_{3}+\mathrm{K}_{2} \mathrm{CO}_{3} \), mixture is :
(a) higher than that of \( \mathrm{Na}_{2} \mathrm{CO}_{3} \)
\( \mathrm{P} \)
(b) higher than that of \( \mathrm{K}_{2} \mathrm{CO}_{3} \)
(c) lower than that of both \( \mathrm{Na}_{2} \mathrm{CO}_{3} \) and \( \mathrm{K}_{2} \mathrm{CO}_{3} \)
(d) lower than that of \( \mathrm{K}_{2} \mathrm{CO}_{3} \) only
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