TS EAMCET Equilibrium — practice questions
98 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice TS EAMCET Equilibrium in the app →Le Chatelier's principle says that if a system at equilibrium is disturbed, the system will shift in the direcFor the reaction aA + bB ⇌ cC + dD at equilibrium, the equilibrium constant Kc is:For an exothermic reaction at equilibrium, increasing temperature will shift the equilibrium:Le Chatelier's principle states that a system at equilibrium responds to a stress by:For the reaction N2 + 3H2 ⇌ 2NH3, increasing pressure favours:Relation between Kp and Kc for a gas reaction with Δn_gas = change in moles of gas:For an endothermic reaction, increasing T shifts equilibrium:For dissociation of weak acid HA in water: HA ⇌ H+ + A-. Equilibrium constant is called:pH of a 0.01 M HCl solution:pOH of a solution with pH = 8.5 (at 25°C):Solubility product Ksp of AgCl is 1.6 × 10⁻¹⁰. Its solubility in pure water (mol/L):For a buffer solution containing weak acid HA and its salt NaA, the pH is approximately:At equilibrium for an exothermic reaction, increasing pressure (for gas reaction with Δn < 0):At 500 K, Kc for N2 + 3H2 ⇌ 2NH3 is 60 (in mol⁻² L²). Kp at 500 K (R = 0.0821):For weak acid HA with Ka = 10⁻⁵, [H+] in 0.1 M solution is approximately:Buffer capacity is maximum when:A weak base BOH has Kb = 1.8 × 10⁻⁵. pH of 0.1 M solution is approximately:Solubility of CaF2 in water (Ksp = 4.0 × 10⁻¹¹):For the reaction PCl5(g) ⇌ PCl3(g) + Cl2(g), if initial pressure of PCl5 is P0 and degree of dissociation is αFor the reaction 2SO2(g) + O2(g) ⇌ 2SO3(g), at equilibrium increasing pressure:If K = 1 for a reaction, the standard free energy change ΔG°:At 298 K, water has Kw = 10⁻¹⁴. Concentration of H+ in pure water:At equilibrium, the ratio of forward to reverse reaction rates:In a saturated solution of AgCl, [Ag+] = 1.26 × 10⁻⁵. If KNO3 is added (no common ion), solubility of AgCl:For the reaction H2(g) + I2(g) ⇌ 2HI(g) with Kc = 50 at 800 K, if [H2] = [I2] = 0.01 M initially, equilibrium Degree of dissociation α of weak acid HA (Ka = 1.8 × 10⁻⁵) in 0.01 M solution:Ice and water stay in equilibrium in an insulated flask at atmospheric pressure at which temperature?Ice and water coexist at 1 atm at which temperature?A liquid with higher vapour pressure at a set temperature isWater and its vapour are in equilibrium at 100 degrees C at what pressure?How does the boiling point of water change at high altitude?Solid iodine in a closed vessel fills it with what colour of vapour?Adding radioactive sugar to a saturated sugar solution shows that equilibrium isA solution in which no more solute dissolves at a given temperature is calledThe fizzing of carbon dioxide on opening a soda bottle is governed by which law?Ice and water at 1 atm can stay in equilibrium at how many temperatures?For aA + bB to cC + dD, the expression for Kc isIf Kc for H2 + I2 to 2HI is 57.0 at 700 K, Kc for 2HI to H2 + I2 isIf all coefficients in a balanced equation are halved, the new Kc equalsWhich relation connects Kp and Kc for a gaseous equilibrium?For N2(g) + 3H2(g) to 2NH3(g), the value of dn used in Kp = Kc(RT)^dn isFor which equilibrium is Kp equal to Kc?For 2NOCl(g) to 2NO(g) + Cl2(g), what is dn?What are the units of Kc for N2(g) + 3H2(g) to 2NH3(g)?For CaCO3(s) to CaO(s) + CO2(g), the equilibrium constant Kp equalsThe value of Kc for a reaction at a fixed temperature depends onA very large Kc, say above 1000, suggests that at equilibriumIf the reaction quotient Qc is greater than Kc, the reaction willFor H2 + I2 to 2HI (Kc = 57.0), a mix has [H2] 0.10 M, [I2] 0.20 M, [HI] 0.40 M. Qc isWhen Qc is less than Kc, the net reaction moves towardWhich equation links the standard Gibbs energy change with K?A reaction has dG0 = +13.8 kJ/mol at 298 K. Its Kc is aboutLe Chatelier's principle says that a change in conditions at equilibrium makes the systemIn the Haber process, removing ammonia as it forms shifts the equilibriumFe3+ and SCN- form a deep red complex. Adding Hg2+ to this mix willRaising pressure on N2 + 3H2 to 2NH3 at fixed temperature shifts it towardChanging pressure has no effect on the equilibrium position ofAdding an inert gas to an equilibrium mixture at constant volume willRaising the temperature of an exothermic equilibrium causes its K toCooling an NO2 and N2O4 mixture in a freezing mixture makes its brown colourA catalyst added to a reaction at equilibrium willCompared with its conjugate base, a conjugate acid hasIn NH3 + H2O to NH4+ + OH-, the conjugate acid of NH3 isWhen water donates a proton to ammonia, its conjugate base formed isWhat is the conjugate acid of the amide ion NH2-?If a Bronsted acid is very strong, its conjugate base isIn the Lewis concept, a base is a species thatBF3 has no proton yet acts as an acid by reacting with NH3. It is aA bare proton in water bonds to a water molecule and exists asAn acid-base equilibrium lies on the side that formsA very weak acid has a conjugate base that isIn pure water at 298 K, the hydronium ion concentration isA NaOH solution has [OH-] = 10^-4 M at 25 C. Its pH isIf the pH of a solution falls by one unit, its H+ concentrationA soft drink has [H+] = 3.8 x 10^-3 M. Its pH is closest toWhat is the approximate pH of a 1.0 x 10^-8 M HCl solution?The pH of normal human blood is aboutFor weak acids at the same temperature, a larger Ka means the acid isAdding sodium acetate to acetic acid solution lowers the acid's ionisation. This is thepKa of acetic acid is 4.76 and pKb of NH4OH is 4.75. The pH of ammonium acetate is aboutA mixture of acetic acid and sodium acetate acts as a buffer around which pH?Which pair forms a basic buffer solution?Adding NaCl to a saturated AgCl solution changes the solubility of AgCl byA salt precipitates from solution when its ionic productFor a dibasic acid H2X, how do its two ionisation constants compare?Phenolphthalein shows different colours in acid and base because it isFor an exothermic reaction, what happens to the equilibrium constant K when temperature is raised?A gas equilibrium is compressed. Which side is favoured?Helium is added to a gas-phase equilibrium at constant volume. What happens to the equilibrium?In CO + 2 H2 ⇌ CH3OH, extra CO is added. What happens to the methanol concentration?Who found in 1803 that some chemical reactions are reversible, leading to the idea of chemical equilibrium?Which pair of chemists proposed the law of mass action in 1865?What must be true of the forward and reverse reaction rates when a system is at chemical equilibrium?The reaction N2 + 3 H2 ⇌ 2 NH3 has ΔH = -92 kJ per mole. What kind of reaction is it?Which equation gives the theoretical basis for the temperature dependence of K?Why does a catalyst leave the equilibrium composition unchanged?What does a catalyst do to the rate of a reaction?When a species is added to an equilibrium, which side is favoured?