Kanta Jha

(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/

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Kanta Jha

Asked: January 31, 2025In: Class 9 Science

Seema visited a Natural Gas Compressing Unit and found that the gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with friends she got confused. Help her to identify the correct set of conditions. (a) Low temperature, low pressure (b) High temperature, low pressure (c) Low temperature, high pressure (d) High temperature, high pressure

(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/

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Kanta Jha

Forces of attraction are (a) maximum in solids and minimum in gases. (b) maximum in gases and minimum in solids. (c) maximum in liquids and minimum in gases. (d) maximum in gases and minimum in liquids.

The boiling points of diethyl ether, acetone and n-butyl alcohol are 35 °C, 56 °C and 118 °C respectively. Which one of the following correctly represents their boiling points in kelvin scale? (a) 306 K, 329 K, 391 K (b) 308 K, 329 K, 392 K (c) 308 K, 329 Κ, 391 Κ (d) 329 K, 392 Κ, 308 K

Which condition out of the following will increase the evaporation of water? (a) Increase in temperature of water (b) Decrease in temperature of water (c) Less exposed surface area of water (d) Adding common salt to water

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