Chemistry Question Bank

For a reversible reaction : A + B C dx dt = 2.0 × 103 L mol–1 s–1 [A] [B] – 1.0 × 102 s–1 [C] where x is the amount of ‘A’ dissociated. The value of equilibrium constant (Keq) is :

The standard state Gibb’s free energy change for the isomerization reaction cis-2-pentene trans-2-pentene is –3.67 kJ mol–1 at 400 K. If more trans-2-pentene is added to the reaction vessel

Consider the reaction PCl5 (g) PCl3 (g) + Cl2 (g) in a closed container at equilibrium. At a fixed temperature what will be the effect of adding more PCl5 on the equilibrium concentration of Cl2 (g) ?

In which of the following, the forward reaction is favoured by use of high pressure ?

Which one of the following information can be obtained on the basis of Le Chatelier principle ?

According the Le-Chatelier’s principle, adding heat to a solid and liquid in equilibrium will cause the

For the gas phase reaction 2 NO N2 + O2, H = – 43.5 Kcal mol–1which one of the statement below is true for N2 (g) + O2 (g) 2 NO (g)

Change in volume of the system does not alter the number of moles in which of the following equilibrium

In which of the following system, doubling the volume of the container cause a shift to the right

The exothermic formation of ClF3 is represented by the equation Cl2(g) + 3F2(g) 2ClF3(g); H = – 329 kJ Which of the following will increase the quantity of ClF3 in an equilibrium mixture of Cl2, F2 and ClF3

The effect of increasing the pressure on the equilibrium 2A(g) + 3B(g) 3A(g) + 2B(g) is

Following gaseous reaction is undergoing in a vessel C2H4 + H2 C2H6; H = – 32.7 Kcal Which will increase the equilibrium concentration of C2H6

In the reaction A(g) + 2B(g) C(g) + Q kJ, greater product will be obtained or the forward reaction is favoured by

According to Le-Chatelier principle, if heat is given to solid-liquid system, then

The reaction A + B C + D +heat has reached equilibrium. The reaction may be made to proceed forward by

In the following reversible reaction 2SO2 + O2 2SO3 + Q Cal Most suitable condition for the higher production of SO3 is

Which of the following reactions proceed at low pressure

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…

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

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)

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 :…

Variation of log K with 1 T is shown by the following graph. Hº for the reaction will be :

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 …

Assertion : For a reaction at equilibrium, the free energy for the reaction is minimum. Reason : The free energy for both reactants and products decreases and become equal.

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 : Chemic…