Question

Which of the following metal does not react with water?
a. Potassium b. Calcium
C. Iron
d. sodium​

Answer 1

Answer:

c. Iron

Explanation:

Iron is comparatively less reactive than the other given metals, and thus reacts with steam instead of water.

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Answer 2

Iron does not react with water.

Explanation:

• Those that can easily and violently react with water refers to the Water-sensitive chemicals.
• These water sensitive chemicals includes sodium, potassium and lithium.
• They can easily combine and react with water producing hydrogen gas and heat.
• When they integrate with the oxygen present in the air they can explode.
• Iron reacts slowly with steam forming oxides.
• Iron can react with oxygen in the presence of air containing moisture forming rust.
• Thus, the sodium, potassium and calcium can easily react with water.

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Assertion (A) : Alloys are commonly used in electrical heating devices

like electric iron and heater.

Reason (R) : Resistivity of an alloy is generally higher than that of its

constituent metals but the alloys have low melting points then their

constituent metals.​