9. The metal which can be cut with a knife (a) Sodium and potassium (b) Barium and calcium (c) Sodium and mercury (d) Potassium and calcium.
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A sodium and potassium
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Sodium, potassium, lithium are soft metals and can be easily cut. It is the secong least dense metal after lithium. It is a soft solid that has a low melting point and can be cut with knife while iron and gold are hard and dense metals which are melleable and ductile.
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