Question

# All metals are solid except

A

Calcium $\left(\mathrm{Ca}\right)$

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B

Mercury $\left(\mathrm{Hg}\right)$

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C

Sodium $\left(\mathrm{Na}\right)$

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D

Potassium $\left(\mathrm{K}\right)$

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Solution

## The correct option is B Mercury $\left(\mathrm{Hg}\right)$On the basis of their properties, all the elements are classified into two main groups: metals and non-metals. PROPERTIES OF METALSPROPERTIES OF NON-METALS1. 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 $\left(\mathrm{Hg}\right)$ is the only metal that exists in a liquid state at room temperature. The explanation for incorrect options:Calcium $\left(\mathrm{Ca}\right)$, Sodium $\left(\mathrm{Na}\right)$ and Potassium $\left(\mathrm{K}\right)$ are the solid metals. Therefore, (A), (C) and (D) are incorrect options. Hence, the correct option is (B).

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