19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
If standard heat of dissociation of PCl₅ is 230 cal, then slope of the graph of log k vs 1 T is
Assertion : For PCl₅(g) PCl₃(g) + Cl₂(g). If more Cl₂ is added, the equilibrium will shift in backward direction hence equilibrium constant will decrease. Reason : Addition of inert gas to the equilibrium mixture at c…
Assertion : The addition of an inert gas under constant volume condition cause the total pressure of the system to increase. This would thus lower the degree of dissociation of PCl₅. Reason : Addition of inert gas at …
Assertion : Addition of an inert gas at constant pressure equilibrium will support the dissociation of PCl₅ at the same temperature. Reason : The addition of an inert gas will tend to increase the total pressure.
Assertion : For the reaction g g g g A B C D at the given temperature, there will be no effect by addition of inert gas either at constant pressure or at constant volume. Reason : For the reaction where n = 0, there i…
Assertion : Kp is equal to Kc for the following reaction: N₂(g) + O₂(g) 2NO(g) Reason : Kp and Kc are interrelated by the following equation : g n p c K K (RT) ng = Number of gaseous moles of products – Number of gase…
Assertion : For a reversible reaction, Gibbs’ free energy is zero at equilibrium. Reason : As reaction approaches equilibrium, Gibbs’ free energy decreases.
Assertion : If some PCl₅(g) containing labelled phosphorus P₃₁ is added to a system with following equilibrium, after sometime the system was found to contain radioactive PCl₃. PCl (g) PCl (g) Cl (g) Reason : Chemical…
In a 1.0 L aqueous solution when the reaction (aq) (s) 2 Ag Cu (aq) (s) Cu 2 Ag reaches equilibrium, [Cu²⁺] = x M and [Ag⁺] = y M. If the volume of solution is doubled by adding water, then at equilibrium : (a) x y [C…
Variation of log K with 1 T is shown by the following graph. Hº for the reaction will be :
In each of the following, total pressure set-up at equilibrium is assumed to be equal and is one atm with equilibrium constants KP given : I :CaCO₃ (s) CaO (s) + CO₂ (g), K₁ II : NH₄HS (s) NH₃ (g) + H₂S (g), K₂ III : …
For the chemical equilibrium, CaCO (s) CaO(s) CO (g) , Hº can be determined from which one of the following graphs ? (a) (b) (c) (d)
If for the heterogeneous equilibrium CaCO₃(s) CaO(s) + CO₂ (g) ; K = 1 at 1 atm, the temperature is given by : (a) Sº T Hº (b) Hº T Sº (c) Gº T R (d) Gº T Hº
In reversible reaction k k A B , the initial concentration of A and B are a and b in moles per litre and the equilibrium concentration are (a – x) and (b + x) respectively ; express x in terms of k1, k2, a and b. (a) …
For the all gas reaction at 1000 K : 2HI H₂ + I₂, K = 0.0344. If you were to begin with 8.0 M of HI in a fixed volume container, what would be the equilibrium concentration of H₂ ?
Consider the reaction NaBr(aq) + H₂SO₄(aq) NaHSO₄(aq) + HBr(aq). The equilibrium constant is 8.3 × 10 –2. If the equilibrium concentrations of NaBr, H₂SO₄ and NaHSO₄ are 6.0 M, 9.0 M and 3.0 M respectively, what is th…
When A2 and B₂ are allowed to react, the equilibrium constant of the reaction at 27ºC is found (Kc = 4). A2(g) + B₂(g) 2AB(g) What will be the equilibrium concentration of AB ?
I I I This reaction is set-up in aqueous medium. We start with 1 mol of I₂ and 0.5 mol of I– in 1L flask. After equilibrium is reached, excess of AgNO₃ gave 0.25 mol of yellow ppt. Equilibrium constant is : [Given : A…
N₂O₄ 2NO₂, Kc = 4. This reversible reaction is studied graphically as shown in the given figure. Select the correct statement out of I, II and III. I : Reaction quotient has maximum value at point A II : Reaction proc…
N₂(g) + 3H₂(g) 2NH₃(g) Initially the molar ratio of N₂ and H₂ was 1 : 3. At equilibrium, 50% of each has reacted. If the equilibrium pressure is P, the partial pressure of NH₃ at equilibrium is:
Given : Reaction Equilibrium constant N₂(g) + 3H₂(g) 2NH₃(g) K₁ N₂(g) + O₂(g) 2NO(g) K₂ H (g) O (g) H O(g) K₃ The equilibrium constant K₄ for the following reaction 2NH (g) O (g) 2NO(g) 3H O(g) may be given as : (a) K…
Au(s) Au(l) Above equilibrium is favoured at
The compound MX is tetrahedral. The number of XMX angles in the compound is:
Given the correct order of initials T or F for the following statements. Use T is statement is true and F if it is false: (I) The order of repulsion between different pair of electrons is LP – LP > LP –BP > BP – BP (I…
Given the correct order of initials T or F for the following statements. Use T if statements is true and F if it is false: (I) CH P CF is non-polar and CH P CF is polar molecule (II) CH P CH bond angles are equal in b…