Is the air we breathe a single compound
1 answer:
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Answer:
option (d) is false.
Explanation:
Acid dissociation equilibrium of HCN is represented as-
Acid dissociation constant, , is represented as-
where species inside third bracket represents equilibrium concentrations of respective species
So, evidently, presence of excess (or NaCN) in solution will combine with
to produce HCN. Hence
will be larger that it would be if only the HCN solution were present.
According to Le-chatlier principle, addition of HCN will shift equilibrium towards right and addition of NaCN will shift equilibrium towards left to keep constant value at a particular temperature.
NaOH gives acid-base reaction with HCN to produce NaCN and water. So, addition of NaOH will increase concentration of and decrease concentration of HCN