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Malleable, Can conduct heat, and Can conduct electricity are properties of most metals in the solid state.

Most metals exhibit properties such as malleability, the ability to conduct heat, and the capacity to conduct electricity when in solid form. These characteristics are fundamental to the behavior of metals and distinguish them from nonmetals.

A) Malleable

Malleability is a key property of metals, allowing them to be hammered or pressed into shapes without breaking. This characteristic is due to the ability of metal atoms to slide over each other while maintaining metallic bonding, making this option correct.

B) Can conduct heat

Metals are excellent conductors of heat because of the presence of free electrons that can transfer energy efficiently. This property is essential for many applications, including cooking and industrial processes, confirming that this option is correct.

C) Can conduct electricity

Similar to heat conduction, metals can also conduct electricity due to the movement of free electrons. This property is vital for electrical wiring and electronic components, making this option accurate as well.

D) Melt at 100°C

The melting point of metals is typically much higher than 100°C, with most common metals like iron, copper, and aluminum having melting points well above this temperature. Therefore, this option is incorrect as it does not represent a property of most metals.

Conclusion

The correct properties of malleability, heat conduction, and electrical conductivity highlight the distinctive characteristics of metals in solid form. Option D fails to align with the known melting points of metals, further solidifying the validity of options A, B, and C as essential properties of metals.