Which of the following acids does not form acidic salts? a-Phosphoric acid
b-Carbonic acid
c-Hydrochloric acid
d-Sulphuric acid

Carbon containing acids are week as it breaks down and form H+ ions .

Let's see

Take Carbonic acid.

Hence it doesn't form acid salts instead it forms bicarbonate ions

Option B is correct

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.

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