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Consider the following processes :I. Dilution of sulphuric acidII. Sublimation of dry iceIII. Condensation of water vapoursIV. Dissolution of ammonium chloride in waterThe endothermic process(es) is/are :(a) I and III(b) II only(c) III only(d) II and IV |
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Answer» Correct answer is (d) II and IV (i) Whenever, concentrated H2SO4 is diluted with water to obtain dilute H2SO4 acid, Huge amount of Heat released. that's why it is exothormic process. (ii) In sublimation, substance changes its physical state from solid to gas, without going in liquid state. Thus, to change the physical state from solid to liquid we have to require heat energy. Hence, it is endothermic process. (iii) Condensation of water vapours are gives up heat energy. Hence it is a exothermic process. (iv) NH4Cl(s) \(\longrightarrow\) NH4(aq) + Cl-(aq) ΔH = +ve On dissolution of ammonium chloride in water, the temperature of water decreases. it means on dissolution of NH4Cl some heat absorbs from water. Hence, it is a endothermic process. |
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