The compound that is used in nuclear industry as protective shields and control rods is

Options

A. metal carbonates
B. metal chlorides
C. metal oxides
D. metal borides

Answer

To solve the question regarding the compound used in the nuclear industry as protective shields and control rods, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Control Rods and Protective Shields**:
- Control rods are materials used in nuclear reactors to control the rate of fission of nuclear fuel. They absorb neutrons, which helps to regulate the nuclear reaction.
- Protective shields are used to protect against radiation emitted during the nuclear reactions. They also help in absorbing neutrons.

**Hint**: Think about the role of control rods and protective shields in managing nuclear reactions.

2. **Identifying Suitable Materials**:
- To be effective, materials used for control rods and protective shields must have a high neutron absorption capacity. This is crucial for controlling the fission process and protecting against radiation.

**Hint**: Consider materials known for their neutron absorption properties.

3. **Evaluating Options**:
- The question provides several options:
- Option 1: Metal carbonates
- Option 2: Metal chlorides
- Option 3: Metal oxides
- Option 4: Metal borides
- We need to evaluate which of these options is known for its ability to absorb neutrons effectively.

**Hint**: Recall which elements or compounds are commonly associated with neutron absorption in nuclear applications.

4. **Identifying the Correct Compound**:
- Among the options, boron (specifically the isotope B-10) is known for its excellent neutron absorption capabilities. Therefore, metal borides, which contain boron, are used in the nuclear industry for control rods and protective shields.

**Hint**: Think about the properties of boron and its isotopes in relation to neutron absorption.

5. **Conclusion**:
- Based on the evaluation, the correct answer is that metal borides are used in the nuclear industry as protective shields and control rods.

**Final Answer**: The compound that is used in the nuclear industry as protective shields and control rods is **metal borides**.