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Shib Sagar posted an Question

August 01, 2020 • 19:04 pm

30 points

IIT JAM
Chemistry (CY)

Sovle this two question and the concept behind the question

The hydration of ionic compounds involves (a) Evolution of heat

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Suman Kumar

See this
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question 70 . It is the Ions which conducts elecricity.
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Ethanol is non polar compound so it just mixes with water.
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Ethanol doesn't dissociate into ions
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No ions means no electricity
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Did you get this SHIB
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If not then please ask
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please respond dear
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Dinesh khalmaniya 1

69) When ionic compound dissolves in water, it dissociates into ions and these ions are solvated by water molecules. This is an exothermic process.
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sir pz elaborate option a and c
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wait..
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Ashutosh singh

The attractive forces starts weakening and the ions are hydrated. This process involves heat too!
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Ashutosh singh

let's just suppose that we have NaCl as the ionic compound. As soon as we add this NaCl in water, the attractive forces between Na+ and Cl- starts weakening due to start of solvation of both the ions.
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Dinesh khalmaniya 1 Best Answer

69) option d and 70) option c
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explaination 70)
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69) explaination - When ionic compound dissolves in water, it dissociates into ions and these ions are solvated by water molecules. This is an exothermic process.
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got it??
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sir can u explain question 70 again i didn't understand
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wait..
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simply Alcohol is an covalent compounds so we know that covalent compounds not dissociate into their ions in water so due to non availability of ions in Water it is non conducting in nature
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Ashutosh singh

69 - All of these.
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Due to hydration of ions I.e cations and anions, heat is evolved.
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70 - C
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Because Alcohol is not a strong electrolyte is made up of covalent forces..it's not conductive in nature.
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sir pz elaborate option a and c
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Check my comments below.
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I have explained about 69th question in detail in other comments. Also, for 70th, A is a ionic salt which is strong electrolyte..same goes with B and option D is a coordination compound whose ionic sphere can dissociate and act as conductive ions. Leaving behind alcohol only.
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