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Answers
Explanation:
ANSWER.NO.1:- Heating of sugar- chemical change- deforms and loses its composition on heating. Sugar, on heating makes new compound. Heating of ammonium chloride- physical change - it only changes its state but the composition remains same. Ammonium chloride on heating changes from solid to gas.
ANSWER.NO.2:- Cotton clothes are good absorber whereas nylon is not an efficient absorber.So cotton evaporates the sweat and makes us feel cool. Therefore cotton will be comfortable. Cotton clothes will be more comfortable as it is a good absorber of sweat whereas Nylon is not.
ANSWER.NO.3:- A rubber band can change its shape on stretching but it is a solid. This happens because pressure is applied on the band which makes it to change the shape and it gains its original shape when released. So, its a solid.
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Explanation:
If a and b are rational number then which is not always true
(a) a+b is a rational number
(b) a-b is a rational number
(c) a×b is a rational number
(d) a÷b is a rational number
correct answer class 8th