CHEM BRAIN

In the reaction \( A + 2B \leftrightarrow 2C \)  , if 2 moles of A, 3.0 moles of B and 2.0 moles of C are placed in a 2.0L flask and the equilibrium concentration of C is 0.5 mole/ L . The equilibrium constant Kc for the reaction is [KCET 1996] 

In a chemical equilibrium, the rate constant of the backward reaction is 7.5 x 10^-4 and the equilibrium constant is 1.5. So the rate constant of the forward reaction is [KCET 1989] 

A mixture of 0.3 mole of H₂ and 0.3 mole of I₂ is allowed to react in a 10 litre evacuated flask at 500^oC . The reaction is  \( H_2 + I_2 \leftrightarrow 2HI \)  , the K is found to be 64. The amount of unreacted I₂ at equilibrium is [KCET 1990] 

A quantity of PCl₅ was heated in a 10 litre vessel at 250^oC \(  PCl_5 (g) \leftrightarrow PCl_3(g) + Cl_2 (g) \)  . At equilibrium the vessel contains 0.1 mole of PCl₅ 0.20 mole of PCl₃ and 0.2 mole of Cl 2. The equilibrium constant of the reaction is [KCET 1993, 2001; MP PMT 2003] 

For the reaction \( 2SO_2 + O_2 ? 2SO_3 \) , the units of Kc are [CPMT 1990] 

\( A + B \leftrightarrow C + D \) . If finally, the concentration of A and B are both equal but at equilibrium concentration of D will be twice of that of A then what will be the equilibrium constant of reaction. [BHU 2005] 

For the reaction \( N_2(g) + 3H_2(g) \leftrightarrow 2NH_3(g) \) the correct expression of equilibrium constant K is [CPMT 1984, 2000] 

In a chemical equilibrium \( A + B \leftrightarrow C + D \) , when one mole each of the two reactants are mixed, 0.6 mole each of the products are formed. The equilibrium constant calculated is [CBSE PMT 1989] 

Concentration of a gas is expressed in the following terms in the calculation of equilibrium constant [EAMCET 1982] 

For the system \( 3A + 2B \leftrightarrow C \) the expression for equilibrium constant is [NCERT 1981; CPMT 1989; MP PMT 1990; RPMT 1999; Pb. PMT 2002; Pb. CET 2002] 

Unit of Kc for following reaction is H2 + I2 -------> 2HI  MDACT2010

A reaction between CO and H₂0 is 

\(CO+H_2 O \longleftrightarrow CO_2+ H_2\)

The unit of equilibrium for this reaction is ETEA2010

Select the correct equilibrium constant expression, Kc for the following reversible reaction. 

Ce⁺⁴ (aq) + Fe⁺² (aq)<=====> Ce⁺³(aq) + Fe⁺³(aq) ETEA2012 Med

The equilibrium constant in a reversible reaction at a given temperature [AIIMS 1982]

A reversible chemical reaction having two reactants in equilibrium. If the concentrations of the reactants are doubled, then the equilibrium constant will [CPMT 1982, 90; MP PMT 1990,2004; MNR 1992; UPSEAT 2002; KCET 1999; Pb. CET 2004]

On a given condition, the equilibrium concentration of HI, H₂ and I₂ are 0.80, 0.10 and 0.10 mole/litre. The equilibrium constant for the reaction H₂ + I₂ ------> 2HI will be [MP PET 1986]

4 moles of A are mixed with 4 moles of B. At equilibrium for the reaction A + B ----> C + D , 2 moles of C and D are formed. The equilibrium constant for the reaction will be [CPMT 1992]

In the reversible reaction A + B ------> C + D , the concentration of each C and D at equilibrium was 0.8 mole/litre, then the equilibrium constant Kc will be [MP PET 1986]