Ionic Equilibrium PYQs Set 5 (PDF)

Set 5 of 8 · Questions 121-150 of 233

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Mere Teacher · Previous Year Questions NEET Chemistry · Ionic Equilibrium · Set 5 (Q121-150)
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121. $One mole H_{2} O (g) and one mole CO (g) are taken in 1 L flask and heated to 725 K . At equilibrium, 40 % (by mass) of water reacted with CO (g) as follows. H_{2} O (g) + CO (g) ⇌ H_{2} (g) + CO_{2} (g) Its K_{p} value is$ (1) $2.220$ (2) $0.444$ (3) $4.440$ (4) $0.222$ 122. $Which of the following salts will give highest p H in water?$ (1) $KCl$ (2) $N a C l$ (3) $N a_{2} C O_{3}$ (4) $C u S O_{4}$ 123. $Match the following columns: Column-I (Acid) A. HCN B. H_{2} C_{2} O_{4} c. H2S D. Niacin Column-II (K_{a}) (ionisation constant)] 1. 6.8 \times 10-4 2. 8.9 \times 10-4 3. 4.9 \times 10-10 4. 5.6 \times 10-2 5. 1.5 \times 10-5 The correct match is Codes: A B C D$ (1) $1345$ (2) $5234$ (3) $2345$ (4) $3425$ 124. $Find the value of the equilibrium constant (K) of a reaction at 300 K, when standard Gibbs free energy change is - 25 kJ mol^{- 1} ? (Consider R = 8.33 mol^{- 1} K^{- 1})$ (1) $e^{8}$ (2) $e^{9}$ (3) $e^{10}$ (4) $e^{11}$ 125. $Calculate the number of moles of NaOH required to completely neutralise 100 g of 118 % oleum$ (1) $2.4$ (2) $1.2$ (3) $4.8$ (4) $8.4$ 126. $Find out the solubility of Ni (OH)_{2} in 0.1 M NaOH. Given that the ionic product of Ni (OH)_{2} is 2 \times 10^{- 15} .$ (1) $2 \times 10^{- 8} M$ (2) $1 \times 10^{- 13} M$ (3) $1 \times 10^{8} M$ (4) $2 \times 10^{- 13} M$ 127. $Standard entropies of X_{2}, Y_{2} and X Y_{3} are 60,40 and 50 JK^{- 1} mol^{- 1} respectively. At what temperature, the following reaction will be at equilibrium? [given : Δ H^{\circ} = - 30 kJ] \frac{1}{2} X_{2} + \frac{3}{2} Y_{2} ⇌ X Y_{3}$ (1) $500 K$ (2) $750 K$ (3) $1000 K$ (4) $1250 K$ 128. $Which among the following denotes the correct relationship between K_{p} and K_{c} for the reaction, 2 A (g) ⇌ B (g) + C (g)$ (1) $K_{p} > K_{c}$ (2) $K_{c} > K_{p}$ (3) $K_{c} = (K_{p})^{2}$ (4) $K_{p} = K_{c}$ 129. $A solution is prepared by mixing 10 mL of 1.0 M acetic acid and 20 mL of 0.5 M sodium acetate and diluted to 100 mL . If the pK_{a} of acetic acid is 4.76 , then the pH of the solution is$ (1) $4.76$ (2) $3.76$ (3) $5.76$ (4) $9.24$ 130. $pH of a saturated solution of Ca (OH_{2}) is 9. The solubility product (K_{sp}) of Ca (OH)_{2} is:$ (1) $0.5 \times 10^{- 15}$ (2) $0.25 \times 10^{- 10}$ (3) $0.125 \times 10^{- 15}$ (4) $0.5 \times 10^{- 10}$ 131. $The compound whose water solution has the highest p H is$ (1) $N a C l$ (2) $N a H C O_{3}$ (3) $N a_{2} C O_{3}$ (4) $N H_{4} C I$ 132. $Observe the following solutions I. Black coffee II. 0.2 MNaOH III. Lemon juice IV. Lime water V. Human Saliva VI. Tomato juice The number of solutions with pH less than 7 is$ (1) $2$ (2) $5$ (3) $4$ (4) $3$ 133. $Which one of the following pairs of solution is not an acidic buffer?$ (1) $C H_{3} C O O H and C H_{3} C O O N a$ (2) $H_{2} C O_{3} and N a_{2} C O_{3}$ (3) $H_{3} P O_{4} and N a_{3} P O_{4}$ (4) $H C l O_{4} and N a C l O_{4}$ 134. $The solubility product of PbCl_{2} at 298 K is 3.2 \times 10^{- 5} . What is it's solubility in mol dm^{- 3} ?$ (1) $8 \times 10^{- 6}$ (2) $2 \times 10^{- 2}$ (3) $5.6 \times 10^{- 3}$ (4) $5.0 \times 10^{- 2}$ 135. $Arrange the following solutions in the decreasing order of pH (A) 0.01 MHCl (B) 0.01 MNaOH (C) 0.01 MCH_{3} COONa (D) 0.01 MNaCl$ (1) $(B) > (C) > (D) > (A)$ (2) $(A) > (D) > (C) > (B)$ (3) $(A) > (C) > (D) > (B)$ (4) $(B) > (D) > (C) > (A)$ 136. $Find solubility of PbI_{2} if it's solubility product is 7.0 \times 10^{- 9} .$ (1) $1.21 \times 10^{- 3} mol L^{- 1}$ (2) $3.228 \times 10^{- 3} mol L^{- 1}$ (3) $2.831 \times 10^{- 3} mol L^{- 1}$ (4) $1.811 \times 10^{- 3} mol L^{- 1}$ 137. $Calculate the value of the equilibrium constant (K_{P}) for the reaction of oxygen gas oxidising ammonia gas to nitric oxide and water vapour. The pressure of each gas at equilibrium is 0.5 atm .$ (1) $1.5 atm$ (2) $0.5 atm$ (3) $1 atm$ (4) $2.5 atm$ 138. $For the following Assertion and Reason, the correct option is Assertion (A) : When Cu (II) and sulphide ions are mixed, they react together extremely quickly to give a solid. Reason (R) : The equilibrium constant of Cu2+aq+S2-aq⇌CuSsis: high because the solubility product is low.$ (1) $(A) is false and (R) is true.$ (2) $Both (A) and (R) are true but (R) is not the explanation for (A).$ (3) $Both (A) and (R) are true and (R) is the explanation for (A).$ (4) $Both (A) and (R) are false.$ 139. $Given below are two statements : Statement (I) : Aqueous solution of ammonium carbonate is basic. Statement (II) : Acidic/basic nature of salt solution of a salt of weak acid and weak base depends on K_{a} and K_{b} value of acid and the base forming it. In the light of the above statements, choose the most appropriate answer from the options given below :$ (1) $Both Statement I and Statement II are correct$ (2) $Statement I is correct but Statement II is incorrect$ (3) $Both Statement I and Statement II are incorrect$ (4) $Statement I is incorrect but Statement II is correct$ 140. $Aqueous solution of which of the following compounds is the best conductor of electric current?$ (1) $Hydrochloric acid, HCl$ (2) $Ammonia, N H_{3}$ (3) $Fructose,$ (4) $Acetic acid, C_{2} H_{4} O_{2}$ 141. $At T (K) when one mol of X and one mol of Y are heated in a 1 L flask, 0.5 moles of Z is formed at the equilibrium. The K_{c} value for the reaction is X (g) + Y (g) ⇌ Z (g) + A (g)$ (1) $0.5$ (2) $1.0$ (3) $0.75$ (4) $0.82$ 142. $What is the pH of millimolar solution of NaOH ?$ (1) $13$ (2) $11$ (3) $3$ (4) $12$ 143. $In some solutions, the concentration of H_{3} O^{+} remains constant even when small amounts of strong acid or strong base are added to them. These solutions are known as:$ (1) $Ideal solutions$ (2) $Colloideal solutins$ (3) $true solutions$ (4) $Buffer solutions$ 144. $An alkali is titrated against an acid with methyl orange as indictor, which of the following is a correct combination? Base Acid End point$ (1) $Weak Strong Yellow to pinkish red$ (2) $Strong Strong Pink to colourless$ (3) $Weak Strong Colourless to pink$ (4) $Strong Strong Pinkish red to yellow$ 145. $p K_{a} of a weak acid (HA) and p K_{b} of a weak base (BOH) are 3.2 and 3.4, respectively. The pH of their salt (AB) solution is :$ (1) $6.9$ (2) $7.0$ (3) $1.0$ (4) $7.2$ 146. $The p K_{a} of a weak acid (HA) is 4.5. The pOH of an aqueous buffered solution of HA, in which 50% of the acid is ionized, is :$ (1) $9.5$ (2) $7.0$ (3) $4.5$ (4) $2.5$ 147. $If equal volumes of A B_{2} and XY (both are salts) aqueous solutions are mixed, which of the following combination will give a precipitate of AY_{2} at 300 K? (Given K_{sp} (at 300 K) for AY_{2} = 5.2 \times 10^{- 7})$ (1) $2.0 \times 10^{- 4} MAB_{2}, 0.8 \times 10^{- 3} MXY$ (2) $2.0 \times 10^{- 2} MAB_{2}, 2.0 \times 10^{- 2} MXY$ (3) $1.5 \times 10^{- 4} MAB_{2}, 1.5 \times 10^{- 3} MXY$ (4) $3.6 \times 10^{- 3} MAB_{2}, 5.0 \times 10^{- 4} MXY$ 148. $Solubility of calcium phosphate (molecular mass, M) in water is W_{g} per 100 mL at 25^{\circ} C . Its solubility product at 25^{\circ} C will be approximately.$ (1) $10^{7} (\frac{W}{M})^{3}$ (2) $10^{7} (\frac{W}{M})^{5}$ (3) $10^{3} (\frac{W}{M})^{5}$ (4) $10^{5} (\frac{W}{M})^{5}$ 149. $For a reaction, 2 A \to B + C, K_{c} is 2 \times 10^{- 3} . At a given time, the reaction mixture has [A] = [B] = [C] = 3 \times 10^{- 4} M. Which of the following options is correct?$ (1) $The system is at equilibrium$ (2) $The reaction proceeds to the left$ (3) $The reaction proceeds to the right$ (4) $The reaction is complete$ 150. $The formation of ammonia from its constituent elements is an exothermic reaction. The effect of increase temperature on the reaction equilibrium is$ (1) $The rate of the forward reaction becomes zero$ (2) $No effect of temperature.$ (3) $Forward reaction is favored$ (4) $Backward reaction is favored$