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The following substance will be yellow w...

The following substance will be yellow when hot and white when cold 

A

`MgO`

B

`ZnO`

C

`Na_(2)O`

D

`CaO`

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding which substance turns yellow when hot and white when cold, we will analyze the options given: MGO, ZNO, ANATO, and CAO. ### Step-by-Step Solution: 1. **Identify the Properties of Each Option**: - **MGO (Magnesium Oxide)**: This is a white solid at room temperature and does not change color when heated. - **ZNO (Zinc Oxide)**: This is a white powder at room temperature and exhibits a color change when heated. - **ANATO**: This is a natural pigment and does not fit the description of a metal oxide that changes color with temperature. - **CAO (Calcium Oxide)**: This is also a white solid that does not change color upon heating. 2. **Focus on ZNO (Zinc Oxide)**: - Zinc oxide is known to be amphoteric, meaning it can react with both acids and bases. - When heated, zinc oxide absorbs blue light and appears yellow due to a phenomenon called thermochromism. 3. **Color Change Mechanism**: - When zinc oxide is heated, it absorbs energy and changes its electronic state, leading to the emission of a yellow color. - Upon cooling, the energy is released, and the zinc oxide returns to its original state, appearing white. 4. **Conclusion**: - Based on the properties and behavior of the substances, the correct answer is **ZNO (Zinc Oxide)**, which is yellow when hot and white when cold. ### Final Answer: The substance that will be yellow when hot and white when cold is **ZNO (Zinc Oxide)**. ---
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