Chemistry/Chemistry MCQ Question - Chemical Equilibrium Sample Test,Sample questions

Question:
?d[N2O5]/dt represents

1.Rate of formation of N2O5

2.Rate of decomposition of N2O5

3.order of the reaction

4.none


Question:
Addition of CH3COOH and CH3COONa gives in water

1.Standard solution

2.buffer solution

3.acidic buffer solution

4.both b & c


Question:
AgCl dissolved with conc (2x10-2) Ksp will be

1.3.6 x 10-6

2.3.6 x 10-5

3.7.2 x 10-6

4.4 x 10-4


Question:
Any substance which accepts H+ is base favours the concept

1.Lowrys

2.Lewis

3.Arrhenius

4.None of these


Question:
At start of reaction the concentration of reactants is

1.high

2.low

3.according to Kc

4.constant


Question:
By decreasing the pressure the reaction will go to that direction where

1.volume is decreased

2.volume increased

3.heat absorbed

4.no. of moles of specie decreased


Question:
By the addition of base in waterpH will be

1.more than 7

2.less than 7

3.equal to 7

4.no effect


Question:
Catalyst used to speed up the reaction of ammonia synthesis is

1.V2O5

2.V2O5 and Pt

3.Fe

4.Pieces of Fe crystals are embedded in fused mixture of MgO Al2O3 and SiO2


Question:
Chemical equilibrium state is

1.dynamic state

2.static state

3.free state

4.unidirectional state


Question:
Conjugated base of a weak acid is

1.weak

2.strong

3.moderately weak

4.unstable


Question:
Conversion of reactant into product in unit time is called

1.rate of forward reaction

2.rate of backward reaction

3.rate constant

4.rate co-efficient


Question:
Equilibrium state is achieved quickly by the addition of.

1.reactants

2.acid

3.base

4.catalyst


Question:
For a reaction involving only gases at 25?C the equilibrium constant can be expressed in terms of molarity Ke or partial pressure Kp. Which is true about the numerical value of Kp?

1.Kc is generally greaer than Kp

2.Kc is generally less than Kp

3.Kc is generally equal to Kp

4.Kc is equal to Kp if the total moles of reactants and products are equal


Question:
Idea of pH and pOH was put forward by

1.Gibbs

2.Einstein

3.Sorenson

4.Chadwick


Question:
If a buffer solution of higher pH than seven is to be made we use

1.Strong acid and strong base

2.Weak acid and strong base

3.Weak acid and strong base

4.Weak acid and its salt with strong base


Question:
In case of gases Kc is replaced by

1.Ka

2.Kb

3.Kp

4.K


Question:
In rate expression the concentration of reactants is negative. It shows

1.Concentration of reactant does not change

2.Concentration of product increases

3.Concentration of reactant decreases

4.Concentration of reactant increases


Question:
In which of the following equilibria will Kc and Kp have the same value?

1.PCI5 = PCI3 + Cl2

2.N2 + 3H2 = 2NH

3.2CO + O2 = CO2

4.N2 + O2 = 2NO


Question:
Ka<10-3 means

1.Very strong base

2.Very weak acid

3.Very strong acid

4.Very strong salt


Question:
Kc value has

1.No units

2.Units

3.Both a & b

4.None


Question:
Negative log of mular concentration of H+ ions is called

1.pH

2.pOH

3.pKa

4.pKw


Question:
On increasing the temperature the rate of reaction increases mainly because

1.The activation energy of the reaction increases

2.Concentration of the reacting molecules increases

3.Collision frequency increases

4.None of these


Question:
pH of an aqueous solution is 5.5. The hydroxyl ion conc. In the solution would be

1.?5.5

2.?8.5

3.10-8.5

4.10


Question:
Rate expression for ammonia synthesis is

1.Kc=x2/(a-x)(b-x)

2.Kc=x2/v(a-x)

3.Kc=4x2/(a-2x)2(b-x)

4.Kc=4x2v2/(a-x)(b-3x)3


Question:
Rate of disappearance of reactant is equal to

1.Rate of reaction

2.Rate of formation of product

3.Energy released during reaction

4.a and b


Question:
Rate of reaction when concentration of reactants are taken as unity is called

1.Arrhenius constant

2.Molecularity

3.Specific rate constant

4.Ideal rate constant


Question:
Reaction which proceeds in both directions is called

1.reversible

2.irreversible

3.spontaneous

4.non-spontaneous


Question:
Sodium benzoate and benzoic acid are mixed in equimolar ration to form buffer if pKa is 2 what will be the pH?

1.0

2.1

3.2

4.any one


Question:
Solubility of any salt can be determined from

1.Ka

2.Kb

3.Kc

4.Ksp


Question:
Solution having the property of a very little change in pH on adding a small amount of strong acid or base is called

1.buffer solution

2.normal solution

3.standard solution

4.neutral solution


Question:
Spontaneous reactions are

1.Moderate

2.Slow

3.Fast

4.not natural


Question:
Sum of exponents of molar concentration is called

1.Order of reaction

2.Molecularity

3.Rate of reaction

4.Average of reaction


Question:
Temperature for preparation of SO3 is

1.400-500?C

2.400?C

3.600?C

4.200?C


Question:
The addition of a catalyst to the reaction system

1.Increases the rate of forward reaction only

2.Increases the rate of reverse reaction

3.Increases the rate of forward but decreases the rate of backward reaction

4.Increases the rate of forward as well as backward reaction equally


Question:
The pH of 10-3 mol dm-3 of an aqueous solution of H2SO4 is

1.3

2.2.7

3.2

4.1.5


Question:
The pH of human blood is

1.7

2.7.35

3.7.5

4.7.8


Question:
The rate of reaction

1.Increases as the reaction proceeds

2.Decreases as the reaction proceeds

3.Remains the same as the reaction proceeds

4.May decrease or increase as the reaction proceeds


Question:
The specific rate constant of a first order reaction depends on the

1.Time

2.Concentration of the reactant

3.Temperature

4.Concentration of the product


Question:
The value of activation energy is primarily determined by

1.Temperature

2.Effective collision

3.Concentration of reactants

4.Chemical nature of reactants and products


Question:
The value of Kw in an acidic aquueous solution at 298 K is

1.>10-14

2.<10-14

3.101?

4.10-1?


Question:
Unit of Kc is

1.moles2dm+6

2.moles-2dm+6

3.moles+2dm-6

4.Kc may or may not have units


Question:
Unit of rate of reaction is

1.Moles dm-3 sec-1

2.Moles dm-3

3.Moles sec-1

4.Mol-1 dm3 sec-1


Question:
When a graph is plotted between 1/T on X-axis and log k on y-axis a straight line is obtained with a negative slope which has two end in

1.I and II quadrant

2.II and III quadrant

3.III and IV quadrant

4.II and IV quadrant


Question:
When sparingly soluble salt is in equilibrium with molar concentration of its oppositely charged ion when the product is called

1.common ion effect

2.solubility product

3.dissociation constant

4.dissociation constant for an acid


Question:
When the value of Kc is very small then

1.reaction is at start

2.product conc. Is maximum

3.reactant conc. Is minimum

4.reaction is completed


Question:
Which of following is not a base

1.KOH

2.NH3

3.PH3

4.BF3


Question:
Which of the following will not change the concentration of ammonia at the equilibrium ?

1.Increase of pressure

2.Increase of volume

3.Addition of catalyst

4.Decrease of temperature


Question:
Which one of the following aqueous solutions will be basic?

1.NaCI

2.Na2SO4

3.Na2CO3

4.FeCl3


Question:
Which one of the following is a buffer solution?

1.brine

2.blood

3.glue

4.solution of CuSO4


Question:
Which set of solutes will form a buffer when dissolved in water to make 1 litter of solution?

1.0.0002M HCI

2.0.2 mole of NaCI with 0.2 mole of HNO3

3.0.4 mole of CH3COOH with 0.4 mole of NaOH

4.0.4 mole of NH3 with 0.2 mole of HCI


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