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Write answer to the following. How can the rate of the chemical reaction, namely, decomposition of hydrogen peroxide be increased?

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प्रश्न

How can the rate of the chemical reaction, namely, decomposition of hydrogen peroxide be increased?

संक्षेप में उत्तर
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उत्तर

\[\ce{\underset{peroxide}{\underset{Hydrogen}{2H2O}_{2(l)}} -> \underset{water}{2H2O} + \underset{oxygen}{O2\uparrow}}\]

  1. The decomposition of hydrogen peroxide (H2O2) into water and oxygen takes place slowly at room temperature.
  2. However, hydrogen peroxide decomposes rapidly in the presence of manganese dioxide (MnO2) powder, which acts as a catalyst.
  3. Thus, by adding manganese dioxide (MnO2) powder, the rate of a chemical reaction can be increased.
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अध्याय 3: Chemical reactions and equations - Exercise [पृष्ठ ४५]

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बालभारती Science and Technology Part 1 [English] Standard 10 Maharashtra State Board
अध्याय 3 Chemical reactions and equations
Exercise | Q 2. b. | पृष्ठ ४५

संबंधित प्रश्न

Write one equation for decomposition reactions where energy is supplied in the form of heat.


Decomposition reactions require energy either in the form of heat or light or electricity for breaking down the reactants. Write one equation each for decomposition reactions where energy is supplied in the form of heat, light and electricity


A solid substance P which is very hard is used in the construction of many buildings, especially flooring. When substance P is heated strongly, it decomposes to form another solid Q and a gas R is given out. Solid Q reacts with water with the release of a lot of heat to form a substance S. When gas R is passed into a clear solution of substance S, then a white precipitate of substance T is formed. The substance T has the same chemical composition as starting substance P.

  1. What is substance P? Write its common name as well as chemical formula.
  2. What is substance Q?
  3. What is gas R?
  4. What is substance S? What is its clear solution known as?
  5. What is substance T? Name any two natural forms in which substance T occurs in nature.

State an important use of decomposition reactions.


Give one example of a decomposition reaction which is carried out by applying heat.


Give one example of a decomposition reaction which is carried out with electricity.


What type of reaction is represented by the following equation?

\[\ce{CaCO3 -> CaO + CO2}\]


What type of reaction is represented by the following equation?

\[\ce{NH4Cl -> NH3 + HCl}\]


What type of chemical reaction takes place when electricity is passed through water?


Which of the following can be decomposed by the action of light?


When a green iron salt is heated strongly, its colour finally changes to brown and odour of burning sulphur is given out.

  1. Name the iron salt.
  2. Name the type of reaction that takes place during the heating of iron salt.
  3. Write a chemical equation for the reaction involved.

Explain the following type of chemical reaction, giving two examples for it:

Decomposition reaction


What is a redox reaction? Explain with an example.


Identify the type of following reaction :


Study the following figure and answer questions. 

a) After heating Calcium carbonate, which gas is formed in a test tube?
b) When we pass this gas through limewater what change, did you observe?
c) Write down the chemical reaction showing the product formation after heating the Calcium carbonate.

 


(a) Design an activity to demonstrate the decomposition reaction of lead nitrate.

(b) Draw labelled diagram of the experimental set-up. List two main observations.

(c) Write balanced chemical equation for the reaction stating the physical state of the reactant and the products.


Rewrite the following statement by selecting the correct option:
________________ is a decomposition reaction.

Classify the following reaction into different type:

\[\ce{2KClO3(s)->[\Delta] 2KCl(aq) + 3O2(g)}\]


Classify the following reaction into – 

  1. Direct combination 
  2. Decomposition
  3. Displacement
  4. Double decomposition

The reaction is – Zinc hydroxide on heating gives zinc oxide and water.


Give a balanced equation for –

An electrolytic decomposition reaction involving a neutral liquid


Give a balanced equation for the following type of reaction:

A thermal decomposition reaction in which a compound decomposes to give two new compounds.


Differentiate between the following:

Electrolytic decomposition and photochemical decomposition.


The chemical reaction in which two or more products are formed from a single reactant is called ______ reaction.


Explain the reaction given in the figure.


Photolysis is a decomposition reaction caused by ______


Electrolysis is type of ______ reaction.


Chemical volcano is an example of ______ type of reaction.


Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is:


Balance the following chemical equation and identify the type of chemical reaction.

`"HgO"("s") overset("(heat)")(->) "Hg"("l") + "O"_2("g")`


Balance the following chemical equation and identify the type of chemical reaction.

`"H"_2"O"_2("l") overset("U  V")(->) "H"_2"O"("l") + "O"_2("g")`


The reaction of calcium carbonate, with freshly prepared lime water, is shown below:

Answer the questions with the help of a diagram:

  1. What type of reaction does calcium carbonate undergoes?
  2. What change in colour is observed in lime?
  3. Write the chemical equation.


  1. Identify the gasses evolved at the anode and cathode in the above experimental set up.
  2. Name the process that occurs. Why is it called so?
  3. Illustrate the reaction of the process with the help of a chemical equation.

Complete the following reaction:

\[\ce{C_12H_22O11->[Heat]}\] ______ + ______.


When lead nitrate is heated strongly in a boiling tube, two gases are liberated and a solid residue is left behind in the test tube.

  1. Name the type of chemical reaction and define it.
  2. Write the name and formula of the coloured gas liberated.
  3. Write the balanced chemical equation for the reaction.
  4. Name the residue left in the test tube and state the method of testing its nature (acidic/basic).

A solution of a substance ‘X’ is used for whitewashing.

  1. Name the substance ‘X’ and write its formula.
  2. Write the reaction of the substance ‘X’ named in the above formula with water.

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