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Question

All metals are solid except


A

Calcium (Ca)

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B

Mercury (Hg)

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C

Sodium (Na)

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D

Potassium (K)

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Solution

The correct option is B

Mercury (Hg)


On the basis of their properties, all the elements are classified into two main groups: metals and non-metals.

PROPERTIES OF METALSPROPERTIES OF NON-METALS
1. Metals are malleable, i.e., they can be hammered into thin sheets and metals are ductile, i.e., they can be drawn into thin wires.1. Non-metals are brittle (break easily). They are neither malleable nor ductile.
2. Metals are good conductors of heat and electricity.

2. Non-metals are bad conductors of heat and electricity.

Exception- Graphite is a good conductor of electricity.

3. Metals are lustrous (shiny) and can be polished.

3. Non-metals are non-lustrous (dull) and cannot be polished.

Exception- Iodine in a lustrous non-metal.

4. Metals are solids at room temperature.

Exception- Mercury is a liquid metal.

4. Non-metals exist as solid, liquid and gas at room temperature.

5. Metals are generally hard.

Exception- Sodium and potassium are very soft metals.

5. Non-metals are generally not hard.

Exception- Diamond is a very hard non-metal.

The explanation for the correct option:

  • Mercury (Hg) is the only metal that exists in a liquid state at room temperature.

The explanation for incorrect options:

  • Calcium (Ca), Sodium (Na) and Potassium (K) are the solid metals. Therefore, (A), (C) and (D) are incorrect options.

Hence, the correct option is (B).


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