Which one of the following Acids is used as bathroom cleaner and is also present in gastric juices that are responsible for digestion?

Hydrochloric Acid

The correct answer is Option (3) → Hydrochloric Acid

• Hydrochloric acid (HCl) is commonly used in bathroom/toilet cleaners to remove stains and scale.
• It is also naturally present in gastric juice in the stomach, where it plays a vital role in digestion by activating enzymes and killing harmful microbes.

Therefore, the correct answer is Hydrochloric Acid.