Q: The graph between log \$\dfrac { X }{ m }\$ v/s log P is straight-line inclined at an angle \$45^o\$ with intercept 0.30. What will be the rate of adsorption at pressure of 0.4 atm?

Slope in equation is \$\dfrac{1}{n}\$ = tan\$45^o\$ =1 Intercept is logk = 0.30, that implies k=2 Hence by equation \$\dfrac{x}{m} = kp^{1/n}\$ k=2, n=1 and p=0.4\$\therefore\$ Rate of adsorption, x/m is 0.8.Option C is correct.

Q: The enzyme which converts starch into maltose is:

Hence, option \$C\$ is the correct answer .

Q: Select the correct statement from the following.

\$\bullet \quad \$Addition of Catalyst has no effect on the value of equilibrium constant. \$\bullet \quad \$Catalyst increases the rate of forward and backward reaction in equal proprtional. \$\bullet \quad \$The ratio of mixture at equilibrium does not change by catalyst. \$\bullet \quad \$Catalyst may be of solid, liquid or gaseous state.

Question 1

The graph between log $\dfrac { X }{ m }$ v/s log P is straight-line inclined at an angle $45^o$ with intercept 0.30. What will be the rate of adsorption at pressure of 0.4 atm?

Accepted Answer

Slope in equation is $\dfrac{1}{n}$ = tan$45^o$ =1&#10;Intercept is logk = 0.30, that implies k=2&#10;Hence by equation $\dfrac{x}{m} = kp^{1/n}$ k=2, n=1 and p=0.4$\therefore$ Rate of adsorption, x/m is 0.8.Option C is correct.

Question 2

Which one of the following is an example of homogeneous catalysis?

Accepted Answer

Hint: Homogenous catalysts are those in which the catalyst is in the same phase as the reactants and products.Explanation:A)  Haber's process: It combines nitrogen from the air with hydrogen derived mainly from natural gas (methane) into ammonia using Iron oxide catalyst at higher temperature and pressure. The reaction is shown as; $N_{2(g)} +3H_{2(g)} \xrightarrow{FeO_{(s)}} 2NH_{3(g)}$Here, Catalyst is in Solid-phase while reactants are in gases phases. So, it is an example of heterogeneous catalysis.B) Contact process: It involves the following steps:1. makes sulfur dioxide by burning sulfur in excess of air/oxygen.2. converts the sulfur dioxide into sulfur trioxide in the presence of a catalyst vanadium pentoxide ($V_2O_5$V2O5)Reaction is shown as;$SO_{2(g)} + 0.5O_{2(g)} \xrightarrow{V_2O_{5(s)}} SO_{3(g)}$Here, Catalyst is in Solid-phase while reactants are in gases phases. So, it is an example of heterogeneous catalysis.C)  Catalytic hydrogenation is the addition of hydrogen to an unsaturated compound with a double or triple bond such as oil. The process of catalytic hydrogenation utilizes a metal catalyst such as nickel, palladium, or platinum. the reaction is shown as;$ Unsaturated_{(l)} +H_{2(g)} \xrightarrow{Ni_{(s)}} Saturated_{(l)}$Here, Catalyst is in Solid-phase while reactants are in gases phases. So, it is an example of heterogeneous catalysis.D)  Acid hydrolysis of methyl acetate is catalyzed by dilute acid, where it gets converted to methanol and acetic acid. The reaction is shown as;$MeOCOCH_{3(aq.)} + H_2O_{(l)} \xrightarrow{H^+_{(aq)}} MeOH_{(aq.)} + AcOH_{(aq.)}$Here catalyst and the reactants both are in the liquid (Aqueous) phase so it is an example of Homogenous catalysis.Final answer:  Correct Option is $D$

Question 3

The enzyme which converts starch into maltose is:

Accepted Answer

Hence, option $C$ is the correct answer .

Question 4

What is a catalyst? give one example.

Accepted Answer

A catalyst is substance i.e a element or a compound that increases the rate of chemical reaction. Examples: 1) Nickel, Ni is used in hydrogenation of palm oil into margarine.2) Iron, Fe is used in Haber process. (Manufacturing of ammonia)

Question 5

Select the correct statement from the following.

Accepted Answer

$\bullet \quad $Addition of Catalyst has no effect on the value of&#10;equilibrium constant.&#10;&#10;$\bullet \quad $Catalyst increases the rate of forward and backward reaction&#10;in equal proprtional.&#10;&#10;$\bullet \quad $The ratio of mixture at equilibrium does not change by&#10;catalyst.&#10;&#10;$\bullet \quad $Catalyst may be of solid, liquid or gaseous&#10;state.

Question 6

Which of the following statements regarding enzyme inhibition is correct ?

Accepted Answer

Competitive inhibition is seen when the substrate and the inhibitor compete for the active site on the enzyme because a competitive inhibitor has a similar structure as that of a substrate, so it blocks the active site of an enzyme thereby reducing the production formation.Hence, option C is correct.

Question 7

Which of the following statements about a catalyst is/are true?

Accepted Answer

Hint: A catalyst does not affect the thermodynamic parameters of a reaction such as enthalpy, entropy, Gibbs energy, and equilibrium constant. Explanation for Correct Answer:A catalyst increases the rate of the reaction by lowering the activation energy.The diagram suggests the activation energy with the catalyst and without the catalyst as below;As Catalyst increases the reaction rate by lowering the activation energy, So, Option A is correct.Catalyst does not take part actively in the reaction, it just is consumed in one step and regenerated in another step. and it requires in a very small quantity. So, Option B is also correct.Explanation for Incorrect Answer:A catalyst does not affect the thermodynamic parameters of a reaction. So, Option C is IncorrectA catalyst does not affect the equilibrium constant of a reaction. It just speeds up the rate of attainment of equilibrium. So, Option D is Incorrect.Final answer: Option $A$ and $B$.

Question 8

Differentiate between homogeneous and heterogeneous catalysis with one example of each.

Accepted Answer

&#10;&#10;Homogeneous catalysis: catalysis in which the reactants and&#10;catalyst are in same phase.I.e same physical state.&#10;&#10;Example: $2SO_2(g) +&#10;O_2(g)\overset{NO(gas)}{\rightarrow}2SO_3(g)$&#10;&#10;Heterogeneous catalysis: catalysis in which the reactants&#10;and catalyst are in  phases .Ie different&#10;physical states&#10;&#10;Example: $2SO_(g) +&#10;O_(g)\overset{Pt(s)}{\rightarrow}2SO_3(g)$&#10;&#10;

Question 9

Which of the following is not correct for enzyme catalysis?

Accepted Answer

Enzymes are macromolecular biological catalysts. Enzymes accelerate chemical reactions. The molecules upon which enzymes may act are called substrates and the enzyme converts the substrates into different molecules known as products. Enzyme catalysis is unique in its efficiency and high degree of specificity.Enzymes are Highly specific nature.This says that enzyme is specific for a given reaction.Enzymes are highly active under optimum temperature.The optimum temperature range for enzymatic activity is 298-310K.Enzymes are highly active under optimum pH.Optimum pH level is between 5-7.The activity of enzymes gets increased in presence of activators and co-enzymes.

Question 10

In the presence of a catalyst, the heat evolved or absorbed during the reaction:

Accepted Answer

The enthalpy change value of the reaction will not be affected by a catalyst. A catalyst will only lower the required activation energy for the reactions. Since it will lower the activation energy for both the forward and reverse reactions to the same extent, the net change in enthalpy is zero.

Revise with Concepts

Catalyst

Catalysts in Industry

Adsorption Theory of Catalysis

Zeolite Catalysis

Enzyme Catalysis

Learn with Videos

Quick Summary With Stories

Introduction to Catalysis

Adsorption Theory of Heterogeneous Catalysis

Zeolite Catalysis

Introduction to Enzyme Catalysis

The graph between log $\frac{X}{m}$ v/s log P is straight-line inclined at an angle $4 5^{o}$ with intercept 0.30. What will be the rate of adsorption at pressure of 0.4 atm?

Which one of the following is an example of homogeneous catalysis?

The enzyme which converts starch into maltose is:

What is a catalyst? give one example.

Select the correct statement from the following.

Which of the following statements regarding enzyme inhibition is correct ?

Which of the following statements about a catalyst is/are true?

Differentiate between homogeneous and heterogeneous catalysis with one example of each.

Which of the following is not correct for enzyme catalysis?

In the presence of a catalyst, the heat evolved or absorbed during the reaction:

Revise with Concepts

Catalyst

Catalysts in Industry

Adsorption Theory of Catalysis

Zeolite Catalysis

Enzyme Catalysis

Learn with Videos

Quick Summary With Stories

Introduction to Catalysis

Adsorption Theory of Heterogeneous Catalysis

Zeolite Catalysis

Introduction to Enzyme Catalysis

The graph between log mX​ v/s log P is straight-line inclined at an angle 45o with intercept 0.30. What will be the rate of adsorption at pressure of 0.4 atm?

Which one of the following is an example of homogeneous catalysis?

The enzyme which converts starch into maltose is:

What is a catalyst? give one example.

Select the correct statement from the following.

Which of the following statements regarding enzyme inhibition is correct ?

Which of the following statements about a catalyst is/are true?

Differentiate between homogeneous and heterogeneous catalysis with one example of each.

Which of the following is not correct for enzyme catalysis?

In the presence of a catalyst, the heat evolved or absorbed during the reaction:

The graph between log $\frac{X}{m}$ v/s log P is straight-line inclined at an angle $4 5^{o}$ with intercept 0.30. What will be the rate of adsorption at pressure of 0.4 atm?