Chemistry Question Bank

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)

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

N2 + O2 2NO - Q cals In the above reaction which is the essential condition for the higher production of NO

The formation of SO3 takes place according to the following reaction, 2SO2 + O2 2SO3 ; H = – 45.2 Kcal The formation of SO3 is favoured by

In the reaction, A2(g) + 4 B2(g) 2AB4(g) + heat the formation of AB4will be favoured at

Which of the following statements regarding a chemical equilibrium is wrong

In equilibrium CH3COOH + H2O CH3COO– + H The equilibrium constant may change when

What is the effect of halving the pressure by doubling the volume on the following system at 500°C H2(g) + I2(g) 2HI(g)

In which of the following reaction Kp > Kc

The reaction between N2 and H2 to form ammonia has Kc = 6 × 10–2 at the temperature 500°C. The numerical value of Kp for this reaction is

In the gas phase reaction C2H4 + H2 C2H6, the equilibrium constant can be expressed in units of :

For the homogeneous reaction 4 NH3 + 5 O2 4 NO + 6 H2O the equilibrium constant Kc has the units of

The equilibrium constant (Kp) for the reaction PCl5(g) PCl3(g) + Cl2(g) is 16. If the volume of the container is reduced to one half its original volume, the value of Kp for the reaction at the same temperature will be

Calculate the partial pressure of carbon monoxide from the following CaCO3 (s) CaO(s) + CO2; Kp = 8 × 10–2 CO2(g) + C (s) 2CO(g) ; Kp = 2

An amount of solid NH4HS is placed in a flask already containing ammonia gas at a certain temperature and 0.50 atm. pressure. Ammonium hydrogen sulphide decomposes to yield NH3 and H2S gases in the flask. When the dec…

At the equilibrium of the reaction, N2O4 (g) 2 NO2 (g), the observed molecular weight of N2O4 is 80 g mol –1 at 350 K. The percentage of dissociation of N2O4 (g) at 350 K is

The vapour density of completely dissociated NH4Cl would be

3.2 moles of hydrogen iodide were heated in a sealed bulb at 444°C till the equilibrium state was reached. Its degree of dissociation at this temperature was found to be 22%. The number of moles of hydrogen iodide pre…

Pure ammonia is placed in a vessel at temperature where its dissociation (α) is appreciable. At equilibrium

At a certain temp. 2HI H2 + I2 Only 50% HI is dissociated at equilibrium. The equilibrium constant is