Borax bead is responded generally by :

Options

A. Alkali metal salt
B. Alkaline earth metals
C. p-block metal salt
D. d-block metal salt

Answer

To solve the question regarding the response of Borax bead, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Borax Bead Test**: The Borax bead test is a qualitative analysis method used to detect certain metal ions. Borax, chemically known as sodium tetraborate (Na2B4O7·10H2O), is heated to form a glass-like bead.

2. **Heating of Borax**: When Borax is heated, it first loses its water molecules and forms anhydrous sodium tetraborate (Na2B4O7). Upon further heating, it melts into a transparent liquid which solidifies into a glass-like material known as Borax bead (NaBO2).

3. **Interaction with Metal Salts**: The Borax bead can interact with various metal salts. The test is particularly useful for detecting the presence of certain metals based on the color produced when the bead is exposed to a flame.

4. **Characteristic Colors with Metals**: The Borax bead test is known for giving characteristic colors when it reacts with transition metals, which are found in the D-block of the periodic table. Each transition metal produces a distinct color when heated in the Borax bead.

5. **Conclusion**: Based on the properties of the Borax bead and its interaction with metal salts, the correct answer to the question is that Borax bead generally responds to D-block metal salts.

### Final Answer:
The correct option is **D-block metal salts**.