Coordination Compounds

To solve the problem, we need to identify the acidic flux among the given options.

1. Understanding Acidic Flux:
An acidic flux is a substance that has acidic properties, typically forming acidic oxides or dissolving in water to release acidic ions. These substances generally react with basic materials to form salts.

2. Analyzing the Options:

- SiO₂ (Silicon dioxide) is an acidic oxide and forms acidic solutions when dissolved in water, making it an acidic flux.
- CaO (Calcium oxide) is a basic oxide and acts as a basic flux.
- MgO (Magnesium oxide) is also a basic oxide, thus a basic flux.
- CaCO₃ (Calcium carbonate) is neither a pure acidic nor basic oxide, but can act as a neutral flux in certain conditions.

3. Final Answer:
The acidic flux among the options is .

To solve the problem, we need to identify the color of anhydrous copper sulfate ( ).

1. Understanding Anhydrous Copper Sulfate:
Anhydrous copper sulfate, , is a white, crystalline solid. It is the dry form of copper sulfate and does not contain any water molecules in its structure.

2. Hydrated Copper Sulfate:
On the other hand, hydrated copper sulfate, , is blue in color due to the water molecules associated with the copper ions.

3. Conclusion:
The color of anhydrous copper sulfate is white.

Final Answer:
The correct answer is (A) White.