1.

Which of the following pairs of substances cannot exist together in solution

Answer»

`Na_2CO_3+NAOH`
`NaHCO_3+Na_2CO_3`
`NaHCO_3+NaOH`
`NaOH+NaCl`

SOLUTION :`NaHCO_3` is a sodium SALT of weak acid, while NaOH is a strong base so, they REACT and cannot exist together in solution: `NaHCO_3 + NaOHtoNa_2CO_3 + H_2O`


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