The more commonly used baking powder contains about `30%NaHCO_(3), 20%NaK(SO_(4))_(2), 10% Ca(H_(2)PO_(4))_(2)` and 40% starch. Which of the following statements is/are correct?

Options

A. `Ca(H_(2)PO_(4))` is acidic and when moistened it reacts with `NaHCO_(4)` evolving `CO_(2)` gas
B. `NaAl(SO_(4))_(2)` shows down the decomposition reaction of `NaHCO_(3)` so that `CO_(2)` is evolved more slowly.
C. `NaAl(SO_(4))_(2)` is acidic and when moistened it reacts with `NaHCO_(3)` evolving `CO_(2)`
D. Both (a) and (b)

Answer

To solve the question regarding the composition of baking powder and determine which statements are correct, we can break down the information provided step by step.

### Step 1: Identify the Components of Baking Powder
The baking powder contains:
- 30% Sodium Bicarbonate (NaHCO₃)
- 20% Sodium Potassium Sulfate (NaK(SO₄)₂)
- 10% Calcium Dihydrogen Phosphate (Ca(H₂PO₄)₂)
- 40% Starch

### Step 2: Understand the Role of Each Component
1. **Sodium Bicarbonate (NaHCO₃)**: This is a basic component that reacts with acids to produce carbon dioxide (CO₂) gas when heated or mixed with an acid.
2. **Calcium Dihydrogen Phosphate (Ca(H₂PO₄)₂)**: This is an acidic component that can donate protons (H⁺ ions) when mixed with water, which helps in the reaction with NaHCO₃.
3. **Sodium Potassium Sulfate (NaK(SO₄)₂)**: This component acts as a stabilizer, slowing down the decomposition of NaHCO₃ to ensure a steady release of CO₂.
4. **Starch**: This is used as a filler and helps to absorb moisture, preventing premature reactions.

### Step 3: Analyze the Reactions
When baking powder is mixed with water:
- The acidic Ca(H₂PO₄)₂ donates protons to NaHCO₃.
- This leads to the formation of carbonic acid (H₂CO₃), which then decomposes into water (H₂O) and carbon dioxide (CO₂).
- The CO₂ gas produced is what helps the dough to rise.

### Step 4: Evaluate the Statements
Now, we need to evaluate the statements provided in the question (not explicitly listed in the prompt but assumed to be related to the functions of the components).

- **Statement A**: Likely discusses the reaction of NaHCO₃ with Ca(H₂PO₄)₂ and the production of CO₂.
- **Statement B**: Likely mentions the role of NaK(SO₄)₂ in stabilizing the reaction.
- **Statement C**: Could be incorrect based on the roles of the components.
- **Statement D**: States that both A and B are correct.

### Conclusion
Based on the analysis:
- **Correct Statements**: A and B are correct regarding the functions of the components in baking powder.
- **Final Answer**: The correct option is D (Both A and B).