Question

Which of the following is known as fusion mixture?
A) Mixture of $N{{a}_{2}}C{{O}_{3}}+NaHC{{O}_{3}}$
B) $N{{a}_{2}}C{{O}_{3}}+10{{H}_{2}}O$
C) Mixture of ${{K}_{2}}C{{O}_{3}}+N{{a}_{2}}C{{O}_{3}}$
D) $NaHC{{O}_{3}}$

Answer 1

The mixture of salts of Sodium and Potassium is called a fusion mixture. It is used for the qualitative test for organic compounds.

Complete answer:
The fusion mixture is the mixture containing the salts of sodium (Na) and the potassium (K) salts.
Generally used fusion mixture is the potassium carbonate and sodium carbonate mixture.
The mixture is called a fusion mixture, since they are fused with the organic compounds and various tests for the group analysis are done using this mixture.
The fusion mixture is very much effective for the qualitative analysis for the organic compounds for different groups. Since Na and K belong to the first group i.e. the alkali metals, which are the most reactive elements in the periodic table.
Na and K as they are more reactive, they have the potential to break the covalent bonds formed between the carbon atom and other atoms like nitrogen, oxygen, sulphur, halides etc.,
And after breaking these covalent bonds, ionic bonds are introduced between the respective atoms and the Na or K in the fusion mixture.
Like with the halides they form the halides and with sulphur they form the sulphides etc.
So a mixture of sodium carbonate and potassium carbonate is called the fusion mixture.

The correct answer for this question is option (C), Mixture of ${{K}_{2}}C{{O}_{3}}+N{{a}_{2}}C{{O}_{3}}$

Note: The Potassium carbonate alone is called as carbonate of potash or as pearl ash
The sodium carbonate is called washing soda, soda ash or soda crystal.