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If enthalpy of neutralisation of HCl by ...

If enthalpy of neutralisation of HCl by NaOH is -58.84 kJ/mol and by `NH_4OH` is -52.26 kJ/mol, then enthalpy of ionisation of `NH_4OH` is

A

6.58 kJ/mol

B

- 6.58 kJ/mol

C

4.5 (kJ)/mol

D

- 4.5 kJ/mol`

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