(c) We can check by adding 273 to the celcius temperature. https://www.tiwariacademy.com/ncert-solutions-class-9-science-curiosity-chapter-1/
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(c) Compression of gas does not increase with temperature. Similar solubility does not always increases with temperatures. https://www.tiwariacademy.com/ncert-solutions-class-9-science-curiosity-chapter-1/
(a) Only increase in temperature will help in the evaporation process. Adding sodium chloride will lower the vapour pressure and hence will lower evaporation. https://www.tiwariacademy.com/ncert-solutions-class-9-science-curiosity-chapter-1/
(c) At low temperature, the energy of the gas molecules becomes low and high pressure brings the molecules closer. These factors help in liquefaction of the gas. https://www.tiwariacademy.com/ncert-solutions-class-9-science-curiosity-chapter-1/
The correct answer is (c) (ii) and (iii). When some hydrogen gas leaks out (ii), fewer molecules remain, increasing intermolecular distance. When the container’s volume increases (iii), molecules spread out to occupy the larger space, increasing their distance. Class 9th ...