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Kanta Jha

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Kanta Jha

Asked: January 31, 2025In: Class 9 Science

Which of the following statements are correct for pure substances? (i) Pure substances contain only one kind of particles. (ii) Pure substances may be compounds or mixtures. (iii) Pure substances have the same composition throughout. (iv) Pure substances can be exemplified by all elements other than copper. (a) (i) and (ii) (b) (i) and (iii) (c) (iii) and (iv) (d) (ii) and (iii)

(b) Pure substances contain one type of particles and have the same composition throughout. https://www.tiwariacademy.com/ncert-solutions-class-9-science-curiosity-chapter-2/

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Kanta Jha

Asked: January 31, 2025In: Class 9 Science

Two substances A and B were made to react to form a third substance A₂B according to the following reaction: 2A + B → A₂B Which of the following statements concerning this reaction are incorrect? (i) The product A₂B shows the properties of the substances A and B. (ii) The product will always have a fixed composition. (iii) The product so formed cannot be classified as a compound. (iv) The product so formed is an element. (a) (i), (ii) and (iii) (b) (i), (ii) and (iv) (c) (i), (iii) and (iv) (d) (ii), (iii) and (iv)

(c) Only the statement (ii) that the product will always have a fixed composition. https://www.tiwariacademy.com/ncert-solutions-class-9-science-curiosity-chapter-2/

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Kanta Jha

Asked: January 31, 2025In: Class 9 Science

A few substances are arranged in the increasing order of forces of attraction between their particles. Which one of the following represents a correct arrangement ? (a) Water, air, wind (b) Air, sugar, oil (c) Oxygen, water, sugar (d) Salt, juice, air

(c) Solids have the maximum force of attraction between particles followed by liquids followed by gases. 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

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.

(a) Particles are closest in solids and maximum apart in gases. 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

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

(c) We can check by adding 273 to the celcius temperature. https://www.tiwariacademy.com/ncert-solutions-class-9-science-curiosity-chapter-1/

Kanta Jha

Asked: January 31, 2025In: Class 9 Science

Which one of the following sets of phenomenon would increase on raising the temperature? (a) Diffusion, evaporation, compression of gases. (b) Evaporation, compression of gases, solubility. (c) Evaporation, diffusion, expansion of gases. (d) Evaporation, solubility, diffusion, compression of gases.

(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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Kanta Jha

Asked: January 31, 2025In: Class 9 Science

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

(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/

Poll

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

A few substances are arranged in the increasing order of forces of attraction between their particles. Which one of the following represents a correct arrangement ? (a) Water, air, wind (b) Air, sugar, oil (c) Oxygen, water, sugar (d) Salt, juice, air

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 one of the following sets of phenomenon would increase on raising the temperature? (a) Diffusion, evaporation, compression of gases. (b) Evaporation, compression of gases, solubility. (c) Evaporation, diffusion, expansion of gases. (d) Evaporation, solubility, diffusion, compression of gases.

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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