(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/
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(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 ...
The correct answer is (a) humidity is high in air. During the rainy season, the air contains more water vapor, which increases humidity. This reduces the rate of evaporation because the air is already saturated with moisture, limiting further evaporation.
The correct answer is (d) all of these. Solids, liquids and gases differ in particle arrangement, attractive forces and spaces between particles. Solids have tightly packed particles with strong forces, liquids have moderate spacing and gases have widely spaced particles ...
The correct answer is (a) Conversion of solid into vapours without passing through the liquid state is called sublimation. Sublimation occurs when substances like camphor or dry ice change directly from a solid to a gas without becoming liquid. Class ...
The Kelvin temperature is found by adding 273 to the Celsius temperature. Thus, 25°C = 298 K, 38°C = 311 K, and 66°C = 339 K, making option (a) the correct choice. Class 9th Science NCERT MCQ Questions NCERT Books ...
The correct answer is (c) Gases and liquids behave like fluids. Fluids are substances that can flow and take the shape of their container. Both gases and liquids exhibit this property because their molecules can move freely, unlike solids, which ...
The correct answer is (d) All of these. Iodine, camphor, and naphthalene all undergo sublimation, meaning they directly change from solid to gas without becoming liquid. This process occurs due to weak intermolecular forces, allowing these substances to vaporize upon ...