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Question 1. Delhi Answer: Rate of a reaction: Either, The change in the concentration of any one of the reactants or products per unit time is called rate of a reaction. Or, The rate of a chemical reaction is the change in the molar concentration of the species taking part in a reaction per unit time. Question 2. All India Answer: The sum of powers of the concentration of the reactants in the rate law expression is called the order of reaction.

Question 3. All India Answer: The minimum extra amount of energy absorbed by the reactant molecules to form the activated complex is called activation energy. The activation energy of the reaction decreases by the use of catalyst.

Question 4. All India Answer:. Question 5. All India Answer: S -1 is the unit for rate constant of first order reaction. Question 6. Write the unit of rate constant for a zero order reaction. Question 7. Define rate of reaction. Delhi Answer: The change in concentration of reactant or product per unit time is called rate of reaction.

Question 8. Define rate constant K. All India Answer: Rate constant. It is defined as the rate of reaction when the concentration of reaction is taken as unity. Question 9. What is the order of reaction?

Question A reaction is of second order with respect to a reactant. How will the rate of reaction be affected if the concentration of this reactant is i doubled, ii Class 10 Maths Ch 5 Important Questions Value reduced to half? Define the following : i Elementary step in a reaction ii Rate of a reaction All India Answer: i Elementary step in a reaction: Those reactions which take place in one step are called elementary reactions.

Define the following : i Order of a reaction ii Activation energy of a reaction All India Answer: i Order of a reaction :. A reaction is of first order in reactant A and of second order in reactant B.

How is the rate of this reaction affected when i the concentration of B alone is increased to three times ii the concentrations of A as well as B are doubled? The rate constant for a reaction of zero order in A is 0. How long will ch 4 maths class 10 important questions complex take for the initial concentration of A to fall from 0. Delhi Answer: For a zero order reaction. Delhi Answer: Rate expression: The expression which expresses the rate of reaction in terms of molar concentrations of the reactants with each term raised to their power, which may or may not be same as the stoichiometric coefficient of that reactant in the balanced chemical equation.

Rate constant: The rate of reaction when the molar concentration of each reactant is taken as unity. What do you understand by the rate law and rate constant of a reaction? The thermal decomposition of HCO 2 H is a first order reaction with a rate constant of 2. Calculate how long will it take for three-fourths of initial quantity of HCO 2 H to decompose. How is the rate of reaction affected if the concentration of the reactant is reduced to half?

What is the unit of rate constant for such a reaction? Identify the reaction order from each of the following units of reaction rate constant: i L -1 mol s -1 ii L mol -1 s -1 Delhi Answer: Order of reaction: The sum of powers ch 4 maths class 10 important questions complex the concentration of the reactants in the rate law expression is called the order of that chemical reaction.

How is its rate affected if the concentration of the reactant is i doubled ii reduced to half? What is meant by rate of a reaction? Differentiate between average rate and instantaneous rate of a reaction.

All India Answer: Rate of reaction: It is the change in concentration of the reactants or products in a unit time. Average rate : Average rate depends upon the change in concentration of ch 4 maths class 10 important questions complex or products and the time taken for the change to occur. What is the order of this reaction? Find the half life of the reaction.

Rate constant k for a first order reaction has been found to be 2. India Answer: For first order reaction:. What percentage of A 2 B 2 is decomposed on heating for seconds? Antilog 0. All India Answer: Since the reaction is of the first order. Delhi Answer:. Define the following ch 4 maths class 10 important questions complex : a Pseudo first order reaction.

Delhi Answer: a Ch 2 Maths Class 10 Extra Questions Uk Those reactions which are not truly of ch 4 maths class 10 important questions complex first order but under certain conditions become first order reactions are called pseudo first order reaction. All India Answer: i It is zero order reaction. What is the order of the reaction?

Define the following terms : i Rate constant k ii Activation energy E a Comptt. Delhi Answer: i Rate constant k : It is a proportionality constant and is equal to the rate of reaction when the molar concentration of each of the reactants is unity.

How does a change in temperature affect the rate, of a reaction? How can this ch 4 maths class 10 important questions complex on the rate constant of a reaction be represented quantitatively? Define each of the following : i Specific rate of a reaction ii Energy of activation of a reaction Comptt.

All India Answer: i Specific rate of a reaction: Specific rate of reaction is the rate of reaction when the molar concentration of each of the reactants is unity. A reaction is of ch 4 maths class 10 important questions complex order with respect to its reactant.

How will its reaction rate be affected if the concentration of the reactant is i doubled ii reduced to half? Write units of rate constants for zero order and for the second order reactions if the concentration is expressed in mol L -1 and time in second. Delhi Answer: i It is zero order reaction. All India Answer: i H 2 and O 2 do not react at room temperature because they do not have enough activation energy to overcome the exceptionally high activation energy barrier.

Derive integrated rate equation for rate constant of a first order reaction. All India Answer: In a first order reaction, the rate of reaction, is directly proportional to Basic Questions Of Maths For Class 6 University the concentration of the reactant.

All India Answer: i The reaction whose rate constant has same units as the rate of reaction, will have zero order of reaction. A first order reaction has a rate constant of 0.

If we begin with 0. Include units with your answer. All the measurements were taken at K :. The rate of a reaction becomes four times when the temperature changes from K to K. Calculate the energy of activation E a of the reaction assuming that it does not change with ch 4 maths class 10 important questions complex. Calculate the rate constant. Log The rate constant of a reaction at K and K are 0.

The rate constant for a first order reaction is 60 s If initial concentration is [A 0 ]. Using Arrhenius equation.

The rates of most reactions double when their temperature is raised from K to K. Calculate their activation energy. The following data were obtained during the first order thermal decomposition of SO 2 Cl 2 at a constant volume :. Calculate the rate constant k. For the first order decomposition of azoisopropane to hexane and nitrogen at Kthe following data were obtained : Calculate the rate constant. The equation ch 4 maths class 10 important questions complex the reaction is :.

Half-life for a first order reaction s. The half-life of PH 3 is All India Answer: a i Rate of a reaction: The change in the concentration of any one of the reactants or products per unit time is called rate of reaction.

Calculate the energy of activation of the reaction, assuming that it does not change with temperature. Delhi Answer: a In order that the reactants may change into products, they have to cross an energy barrier as shown in the diagram This diagram is obained by plotting potential energy vs. It is believed that when the reactant molecules absorb energy, their bonds are loosened and new bonds are ch 4 maths class 10 important questions complex between.

The intermediate complex thus formed is called activated complex. It is unstable and immediately dissociates to form the stable products. Explain with diagram.

Simply said:

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Free PDF download of Important Questions with solutions for CBSE Class 10 Maths Chapter 4 - Quadratic Equations prepared by expert Mathematics teachers from latest edition of CBSE(NCERT) books. Register online for Maths tuition on myboat200 boatplans . NCERT Solutions for Class 10 Maths Chapter 4- Quadratic Equations A 1 mark question was asked from Chapter 4 Quadratic Equations in the year However, in the year , a total of 13 marks were asked from the topic Quadratic Equations. Class 10 Maths Important Questions with Answers PDF CBSE Important Questions for Class 10 Maths Board Exam will help you in scoring more marks. After solving Class 10 Maths NCERT Book, You can also prioritize the concepts or chapters which you need to focus after going through Important Questions for Class 10 myboat200 boatplans have collected last 10 years Important Questions .

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