11th Class Chemistry Hydrogen & Its Compounds / हाइड्रोजन और इसके यौगिक

  • question_answer 1)
      Give reasons : (i) Lakes freeze from top towards bottom. (ii) Ice floats on water.

    Answer:

      (i) Water has maximum density at\[4{}^\circ C\]. In severe cold, the surface of the sea almost freezes but below the surface, there is water at a temperature of about\[4{}^\circ C\]. This property is extremely helpful for animals living under sea water. (ii) Ice floats on liquid water as its density is less than liquid water.


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