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Substance which is weakly repelled by a...

Substance which is weakly repelled by a magnetic field is

A

`O_(2)`

B

`H_(2)O`

C

`CrO_(2)`

D

`Fe_(3)O_(4)`

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The correct Answer is:
To determine the substance that is weakly repelled by a magnetic field, we need to understand the properties of different types of magnetic materials. ### Step-by-Step Solution: 1. **Understanding Magnetic Properties**: - Materials can be classified based on their magnetic properties into three main categories: - **Diamagnetic**: These materials are weakly repelled by a magnetic field. They have no unpaired electrons. - **Paramagnetic**: These materials are weakly attracted to a magnetic field. They have unpaired electrons. - **Ferromagnetic**: These materials are strongly attracted to a magnetic field and have unpaired electrons that can align in the same direction. 2. **Identifying the Substance**: - The question asks for a substance that is weakly repelled by a magnetic field, which indicates we are looking for a **diamagnetic** substance. 3. **Analyzing the Options**: - Let's evaluate the options provided: - **O2 (Oxygen)**: This is a paramagnetic substance because it has two unpaired electrons. - **Water (H2O)**: Water is a diamagnetic substance as it has no unpaired electrons. - **Chromium (Cr)**: This is a paramagnetic substance due to unpaired electrons in its d-orbitals. - **Iron (Fe)**: This is also a paramagnetic substance with unpaired electrons. 4. **Conclusion**: - Among the options, **water (H2O)** is the only substance that is weakly repelled by a magnetic field, making it the correct answer. ### Final Answer: The substance which is weakly repelled by a magnetic field is **water (H2O)**. ---

To determine the substance that is weakly repelled by a magnetic field, we need to understand the properties of different types of magnetic materials. ### Step-by-Step Solution: 1. **Understanding Magnetic Properties**: - Materials can be classified based on their magnetic properties into three main categories: - **Diamagnetic**: These materials are weakly repelled by a magnetic field. They have no unpaired electrons. - **Paramagnetic**: These materials are weakly attracted to a magnetic field. They have unpaired electrons. ...
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The substances which contain species with unpaired electrons in their orbitals behave as paramagnetic sustances. Such substances are weakly attracted by the magnetic field. The paramagnetism is expressed in terms of magnetic moment. The magnetic moment is related to the number of unpaired electrons according tot he following relation: Magnetic moment mu=sqrt(n(n+2))BM where n=number of unpaired electrons. BM stands for Bohr magneton, a unit of magnetic moment. 1BM=(eh)/(4pimc)=9.27xx10^(-24)Am^(2) or JT^(-1) Q. In Which of these options do both constituents of the pair have the same magnetic moment?

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