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………….does not react with cold water ....

………….does not react with cold water .

A

Sodium

B

Calcium

C

Magneisum

D

Potassium

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The correct Answer is:
To determine which metal does not react with cold water among Sodium, Calcium, Magnesium, and Potassium, we can analyze the reactivity of each metal with water. ### Step-by-Step Solution: 1. **Understanding Reactivity with Water**: - Metals react with water to form metal hydroxides and hydrogen gas. The reactivity varies among different metals. 2. **Identifying Highly Reactive Metals**: - **Sodium (Na)** and **Potassium (K)** are known to be highly reactive with cold water. They react vigorously, producing hydrogen gas and corresponding metal hydroxides. - **Calcium (Ca)** also reacts with cold water, but the reaction is less violent compared to Sodium and Potassium. 3. **Analyzing Magnesium (Mg)**: - **Magnesium** does not react with cold water. Instead, it reacts with steam or hot water. When exposed to moisture in the air, it forms a protective layer of magnesium hydroxide, which prevents further reaction with cold water. 4. **Conclusion**: - Among the given options, Magnesium is the only metal that does not react with cold water. ### Final Answer: **Magnesium does not react with cold water.** ---
To determine which metal does not react with cold water among Sodium, Calcium, Magnesium, and Potassium, we can analyze the reactivity of each metal with water. ### Step-by-Step Solution: 1. **Understanding Reactivity with Water**: - Metals react with water to form metal hydroxides and hydrogen gas. The reactivity varies among different metals. 2. **Identifying Highly Reactive Metals**: ...
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