4. एक पिता और पुत्र की वर्तमान आयु का
योगफल 70 वर्ष है। 10 वर्ष बाद पुत्र की
आयु अपने पिता की आयु की ठीक आधी
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The process of deriving large crystals of pure substances from their solutions is known as crystallisation. It is a physical change. Crystals of salt are obtained by the evaporation of sea water. ... This mixture when filtered and allowed to cool produces crystals of copper sulphate.
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