Answer:
An acid is any hydrogen-containing substance that is capable of donating a proton (hydrogen ion) to another substance.
The acid present in apple – Malic acid
The acid present in tomato – Oxalic acid
The acid present in Grapes – Tartaric acid
The acid present in orange – Ascorbic acid
The acid present in rancid butter – Butyric acid
The acid present in bees – Methanoic acid
