JEE Adv and Mains Chemistry 41 Years Solved Video Solutions 1979 – 2019

Which of the following statements is incorrect? a. In equilibrium mixture of ice and water kept in perfectly insulated flask mass of ice and water do not change with time. b. the intensity of red colour increases when oxalic acid is added to a solution containing iron (III) nitrate and potassium thiocyanate. Kc Which of [...]

Assertion : pH of 10−7MHCl is less than 7 at 25∘C. Reason : At very low concentration of HCl, contribution of `H^(+) from water is considerable. Assertion : pH of 10−7MHCl is less than 7 at 25∘C. Reason : At very low concentration of HCl contribution of `H^(+) from water is considerable. November 22, 2020 [...]

Assertion : Addition of HCl(aq) to HCOOH(aq) decreases the dissociation of HCOOH(aq) Reason : Due to common ion effect of H+, dissociation of HCOOH decreased. Assertion : Addition of HCl(aq) to HCOOH(aq) decreases the dissociation of HCOOH(aq) Reason : Due to common ion effect of H+ dissociation of HCOOH decreased. November 22, 2020 Category: Chapter [...]

Assertion All strong monoprotic acid with same concentration in dilute solution show same pH Reason Water shows leveling effect Assertion All strong monoprotic acid with same concentration in dilute solution show same pH Reason Water shows leveling effect November 22, 2020 Category: Chapter 6 - Ionic Equilibrium (Level 1 and Level 2) , Chapter 7 [...]

Statement 1 : if water is heated to 50 degree c then pH will increase. Statement 2 : Kw increases with increase in temperature. Statement 1 : if water is heated to 50 degree c then pH will increase. Statement 2 : Kw increases with increase in temperature. November 22, 2020 Category: Chapter 6 - [...]

The salt Al(OH)3 involved in the following two equilibria. Al(OH)3(s)⇔Al3+(aq)+3OH−(aq),Ksp Al(OH)3(s)+OH−(aq)⇔Al(OH)−4(aq),Kc Which of the following relationship is CORRECT at which solubility is minimum? Kc Which of the following relationship is CORRECT at which solubility is minimum? Ksp Al(OH)3(s)+OH−(aq)⇔Al(OH)−4(aq) The salt Al(OH)3 involved in the following two equilibria. Al(OH)3(s)⇔Al3+(aq)+3OH−(aq) November 22, 2020 Category: Chapter 6 - [...]

What is [Ag+] in a solution made by dissolving both Ag2CrO4 and Ag2C2O4 until saturation is reached with respect to both salt ? [Ksp=(Ag2C2O4) = 2 × 10^−11, Ksp(Ag2CrO4) = 2 × 10^−12] Ksp(Ag2CrO4) = 2 × 10^−12] What is [Ag+] in a solution made by dissolving both Ag2CrO4 and Ag2C2O4 until saturation is reached [...]

What is maximum pH required to prevent the precipitation of ZnS in a solution that is 0.01 M ZnCl2 and saturated with 0.10M H2S? [Given : Ksp(ZnS)=10^−21, Ka1×Ka2 (of H2S)=10^−20] Ka1×Ka2 (of H2S)=10^−20] What is maximum pH required to prevent the precipitation of ZnS in a solution that is 0.01 M ZnCl2 and saturated with [...]

AgBr(s)+2S2O2−3(aq)⇔[Ag(S2O3)2]3−(aq)+Br−(aq) [Ksp(AgBr)=5×10^−13, Kf[Ag(S2O3)2]3−=5×10^13] What is the molar solubility of AgBr in 0.1M Na2S2O3? AgBr(s)+2S2O2−3(aq)⇔[Ag(S2O3)2]3−(aq)+Br−(aq) [Ksp(AgBr)=5×10^−13 Kf[Ag(S2O3)2]3−=5×10^13] What is the molar solubility of AgBr in 0.1M Na2S2O3? November 22, 2020 Category: Chapter 6 - Ionic Equilibrium (Level 1 and Level 2) , Chapter 7 - Equilibrium , N Awasthi Physical Chemistry ,

There exist an equilibrium between solid SrSO 4 and Sr2+ and SO 4 2− ​ion in aqueous medium. The possible equilibrium states are shown in the figure as thick line. Now of the equilibrium is distributed by addition of (a) Sr(NO3 )2 and (b) K2SO4 ​and dotted line represent approach of system towards equilibrium. Match [...]