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Saturday, 31 October

JEE Main 2021 · ChemistryNumerical answerNumerical valueMediumConceptual

JEE Main 24 February 2021, Shift 1, Chemistry Q60

Question 60 of 90 in this shift, Chemistry question 30 of 30, Section B.

The stepwise formation of [Cu(NH3)4]2+\mathrm{[Cu(NH_3)_4]^{2+}} is given below : Cu2++NH3⇌K1[Cu(NH3)]2+\mathrm{Cu^{2+} + NH_3 \overset{K_1}{\rightleftharpoons} [Cu(NH_3)]^{2+}} [Cu(NH3)]2++NH3⇌K2[Cu(NH3)2]2+\mathrm{[Cu(NH_3)]^{2+} + NH_3 \overset{K_2}{\rightleftharpoons} [Cu(NH_3)_2]^{2+}} [Cu(NH3)2]2++NH3⇌K3[Cu(NH3)3]2+\mathrm{[Cu(NH_3)_2]^{2+} + NH_3 \overset{K_3}{\rightleftharpoons} [Cu(NH_3)_3]^{2+}} [Cu(NH3)3]2++NH3⇌K4[Cu(NH3)4]2+\mathrm{[Cu(NH_3)_3]^{2+} + NH_3 \overset{K_4}{\rightleftharpoons} [Cu(NH_3)_4]^{2+}} The value of stability constants K1K_1, K2K_2, K3K_3 and K4K_4 are 10410^4, 1.58×1031.58\times10^3, 5×1025\times10^2 and 10210^2 respectively. The overall equilibrium constants for dissociation of [Cu(NH3)4]2+\mathrm{[Cu(NH_3)_4]^{2+}} is x×10−12x \times10^{-12}. The value of xx is __________. (Rounded off to the nearest integer)

Official answer

1

NTA final key.

Chapter
Coordination Compounds
Topic
No close match in our taxonomy
Idea tested
No close match in our taxonomy

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.