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Scientific answer: This is a colligative property that depends on the number of particles and not on the type of the particles, i.e., the more particle that you add, the more effect you will gain. The purpose of adding salt is to decrease melting point (or increase boiling in other instances) is to keep the material at a colder temperature that its original ...


The reason is that after arsenic, there is shielding. This causes the intermolecular forces to become weak. Thus, the melting point decreases. I hope you know about shielding of d and f electrons

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