Which of the following metals can be cut with a knife?

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Iron

Sodium

Gold

Magnesium

answer is B.

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Detailed Solution

Sodium metals can be cut with a knife.
Generally, metals are lustrous, malleable, ductile, and have adequate heat- and electricity conductors. The only soft metals that can be cut with a knife are sodium (Na) and potassium (K). Iron (Fe) and gold (Ag) are hard, dense metals that are malleable and ductile. Magnesium (Mg) has the lowest density of any metal element, making it the lightest but also very strong.

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