A) CO is released
B) \[CO+C{{O}_{2}}\] is released
C) \[CO{{ }_{2}}\]is released
D) water vapour is released
Correct Answer: D
Solution :
Washing soda is sodium carbonate decahydrate \[(N{{a}_{2}}C{{O}_{3}}.10{{H}_{2}}O).\] It is an efflorescent substance i.e., give out nine water molecules of crystallization on keeping in air \[N{{a}_{2}}C{{O}_{3}}.10{{H}_{2}}O\xrightarrow{air}\underset{\begin{smallmatrix} Sodium\,carbonate \\ monohydrate \end{smallmatrix}}{\mathop{N{{a}_{2}}C{{O}_{3}}.{{H}_{2}}O+9{{H}_{2}}O}}\,\] But on heating it losses all water molecules to form anhydrous sodium carbonate or soda ash \[N{{a}_{2}}C{{O}_{3}}.10{{H}_{2}}O\xrightarrow{\Delta }\underset{(soda\,ash)}{\mathop{N{{a}_{2}}C{{O}_{3}}}}\,+10{{H}_{2}}O\]
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