Question # 1

Choose an answer

K_p> K_c

K_c> K_p

K_p= K_c

None of these

Buffers having pH less than 7 are made

Choose an answer

Mixture of weak acid + salt of it with strong base

Mixture of weak acid + salt of it with weak base

Mixture of weak base + salt of it with strong acid

Mixture of weak base + salt of it with weak base

Which of the following factors will favour the reverse reaction in a chemical equilibrium?

Choose an answer

Increase in concentration of one of the reactants

Increase in concentration of one of the products

Removal of one of the products regularly

None of these

Law of mass action states that rate of chemical reaction is directly proportional to the product of active masses of the reactants. The term active mass means

Choose an answer

Mass in grams converted to products

Number of moles

Number of moles per dm³of reactants

Total pressures of the reactants

Almost forward reaction is complete when value of k_{c :}

Choose an answer

Neither larger nor very small.

Very small.

Very large.

Negligible.

The equilibrium constant in a reversible chemical reaction at a given temperature

Choose an answer

Depends on the initial concentration of the reactants

Depends on the concentration of one of the products at equilibrium

Does not depend on the initial concentration of rectants

It is characteristic of the reaction

The solubility of PbF₂is 2.6 x 10^-3mole dm^-3then its solubility product is

Choose an answer

2.6 x 10^-3

6.76 x 10^-6

5.2 x 10^-6

7.0 x 10^-8

The solubility product of AgCl is 2.0 x 10^-10mole ²dm^-6. The maximum concentration of Ag⁺ions in the solution is

Choose an answer

2.0 x 10^-10mole dm^-3

1.41 x 10^-5mole dm^-3

1.0 x 10^-10

4.0 x 10^-20mole dm^-3

1 mol of N₂O₄ was decomposed according to given equation in 1dm₃ container. At equilibrium x mole of N₂O₄ have dissociated. What is the value of K_C:

Choose an answer

2x/(1-x)²

4x²/(1-x)

4x/(1-x)

2x/(1-x)

Which one of the following is not a buffer

Choose an answer

H₂CO₃+ NaHCO₃solution

H₃PO₄+ NaH₂PO₄solution

Hl + Nal solution

NH₄OH + NH₄CI solution

The solubility product of AgCl is 2.0 x 10^-10mol²dm^-6The maximum concentration of Ag⁺ions in the solution is

Choose an answer

2.0 x 10^-10mol dm^-3

1.41 x 10^-5mol dm^-3

1.0 x 10^-10mol dm^-3

4.0 x 10^-20mol dm^-3

Choose an answer

A reaction is reversible because :

Choose an answer

Products are stable.

Reactants are reactive.

Products are reactive.

Reactants re stable.

For the above reaction the relationship b/w k_c and k_p will be :

Choose an answer

K_p = K_cRT

Kp = K_c(RT)_-1

K_p = K_c(RT)_-2

K_c = K_p

A chemical reaction is in equilibrium when

Choose an answer

Formation of product is minimum

Reactants are completely transformed into products

Rates of forward and backward reactions are equal

Equal amounts of reactants and products are present

Choose an answer

[A] = [B]

[A] < [B]

[B] = [C]

[A] > [B]

The optimum conditions of temperature and pressure to get maximum NH₃form N₂and H₂gases is

Choose an answer

2000°C and 10 atmosphere

0°C and 1 atmosphere

400°C and 200-300 atmosphere

200°C and 100 atmosphere

Choose an answer

Decrease in temperature favour more dissolution of the salt

Increase in temperature favour more dissolution of the salt

Lowering pressure favour more dissolution of the salt

Increasing pressure favour more dissolution of the salt

In the particular reaction for the valueK_{c 1 x}10^-25which statement is correct :

Choose an answer

Almost forward reaction is completed.

Amount of reactant is negligible as compared to product.

Amount of product is negligible as compared to reactant.

Amount of product is equal to amount of reactant.

The value of K_pis greater than K_cfor a gaseous reaction when

Choose an answer

Number of molecules of products is greater than the reactants

Number of molecules of reactants is greater than those of products

Number of molecules of reactants and products equal

Catalyst is added

For which system does the equilibrium constant. K_chas units of

Choose an answer

Introduction of an inert gas at constant volume

Introduction of PCl₃(g) at constant

Introduction of PCl₅(g) at constant volume

Introduction of Cl₂at constant volume

In a reversible reaction, two substances are in equilibrium. If the concentration of each one is reduced to half, the equilibrium constant will be

Choose an answer

Reduced to half of its original value

Doubled

Same

Reduced to one fourth its original value

When a weak acid is dissolved in water or a weak base dissolved in water, then in both cases the conjugate acid base pair is produced. The ionization constants K_aand K_bof a pair are related with each other as

Choose an answer

K_a= K_b

K_a. K_b= K_w

K_a. K_w= K_b

K_b. K_w= K_a

In exothermic reversible reaction increase in temperature shift the equilibrium to :

Choose an answer

Remains unchanged.

Product side.

Reactant side.

None of above.

Choose an answer

0.5

4.0

2.5

0.25

Choose an answer

0.073

0.147

0.05

0.026

An excess of aqueous silver nitrate is added to aqueous barium chloride and precipitate is removed by filtration. What are the main ions in the filtrate