Arrange the following digestive juices in an order representing strong acid to strong base
A. Saliva B. Pancreatic juice
C. Gastric juice D. Succus entericus

Options

A. C,D, A,B
B. C,A, D,B
C. C, D, A, B
D. A,C, B, D

Answer

To arrange the digestive juices in order from strong acid to strong base, we need to consider the pH levels of each juice. Here’s the step-by-step solution:

### Step 1: Identify the pH of each digestive juice
- **Gastric Juice (C)**: The pH of gastric juice is approximately 2, which makes it highly acidic.
- **Saliva (A)**: The pH of saliva ranges from 6.2 to 7.6, indicating it is slightly acidic to neutral.
- **Succus Entericus (D)**: The pH of succus entericus (intestinal juice) is around 8, making it mildly alkaline.
- **Pancreatic Juice (B)**: The pH of pancreatic juice is about 8.6, which is also alkaline but slightly more so than succus entericus.

### Step 2: Arrange the juices based on their pH
Now that we have identified the pH levels, we can arrange them from strong acid to strong base:
1. **Gastric Juice (C)** - pH 2 (strong acid)
2. **Saliva (A)** - pH 6.2 to 7.6 (slightly acidic to neutral)
3. **Succus Entericus (D)** - pH 8 (mildly alkaline)
4. **Pancreatic Juice (B)** - pH 8.6 (stronger alkaline)

### Final Arrangement
Thus, the correct order from strong acid to strong base is:
**C (Gastric Juice) → A (Saliva) → D (Succus Entericus) → B (Pancreatic Juice)**