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Saturday, 31 October

JEE Main 2021 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 26 August 2021, Shift 2, Chemistry Q57

Question 57 of 90 in this shift, Chemistry question 27 of 30, Section B.

The reaction rate for the reaction [PtCl4]2−+H2O⇌[Pt(H2O)Cl3]−+Cl−[\mathrm{PtCl_4}]^{2-} + \mathrm{H_2O} \rightleftharpoons [\mathrm{Pt(H_2O)Cl_3}]^- + \mathrm{Cl^-} was measured as a function of concentrations of different species. It was observed that −d[[PtCl4]2−]dt=4.8×10−5[[PtCl4]2−]−2.4×10−3[[Pt(H2O)Cl3]−][Cl−].\frac{-\mathrm{d}\left[[\mathrm{PtCl_4}]^{2-}\right]}{\mathrm{dt}} = 4.8 \times 10^{-5}\left[[\mathrm{PtCl_4}]^{2-}\right] - 2.4 \times 10^{-3}\left[[\mathrm{Pt(H_2O)Cl_3}]^-\right]\left[\mathrm{Cl^-}\right]. where square brackets are used to denote molar concentrations. The equilibrium constant Kc\mathrm{K_c} = __________. (Nearest integer)

Official answer

0

NTA final key.

Chapter
Chemical Kinetics
Topic
Chemical Equilibrium
Idea tested
Equilibrium Constant from Rate Constants

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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.