मराठी

The white solid compound A decomposes quite rapidly on heating in the presence of a black substance X to form a solid compound B and a gas C. When an aqueous solution of compound B is reacted with

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प्रश्न

The white solid compound A decomposes quite rapidly on heating in the presence of a black substance X to form a solid compound B and a gas C. When an aqueous solution of compound B is reacted with silver nitrate solution, then a white precipitate of silver chloride is obtained along with potassium nitrate solution. Gas C does not burn itself but helps burn other things.

  1. What is compound A?
  2. What is compound B?
  3. What is gas C?
  4. What do you think is the black substance X? What is its function?
  5. What is the general name of substances like X?
लघु उत्तर
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उत्तर

  1. Compound A is potassium chlorate (KClO3).
  2. Compound B is potassium chloride (KCl).
  3. Gas C is oxygen gas (O2), which does not burn itself but helps burn other things.
  4. Black substance X is manganese oxide (MnO2). Its function is to catalyse the reaction.
  5. The general name of a substance like X (MnO2) is a catalyst.
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पाठ 1: Chemical Reactions and Equations - Exercise 1 [पृष्ठ ३३]

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लखमीर सिंह Chemistry [English] Class 10
पाठ 1 Chemical Reactions and Equations
Exercise 1 | Q 54. | पृष्ठ ३३

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संबंधित प्रश्‍न

Why are decomposition reactions called the opposite of combination reactions? Write equations for these reactions.


Taking into consideration the relationship in the first pair, complete the second pair

2H2 + O2 → 2H2O :Combination Reaction :: 2HgO → 2Hg + O2:_________


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.

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


What type of reaction is represented by the following equation?

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


What type of chemical reaction take place when lime-stone is heated?


Two metals X and Y form the salts XSO4 and Y2SO4, respectively. The solution of salt XSO4 is blue in colour whereas that of Y2SO4 is colourless. When barium chloride solution is added to XSO4 solution, then a white precipitate Z is formed alongwith a salt which turns the solution green. And when barium chloride solution is added to Y2SO4 solution, then the same white precipitate  Z is formed alongwith colourless common salt solution.
(a) What could the metals X and Y be?
(b) Write the name and formula of salt XSO4.
(c) Write the name and formula of salt Y2SO4.
(d) What is the name and formula of white precipitate Z?
(e) Write the name and formula of the salt which turns the solution green in the first case.


Classify the following reaction as combination, decomposition, displacement, precipitation and neutralization. Also balance the equation.

\[\ce{Zn_{(s)} + H2SO4 -> ZnSO4_{(s)} + H2_{(g)}}\]


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

Decomposition reaction


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.

 


Differentiate between direct combination reaction and a decomposition reaction.


Give a balanced equation for –

An electrolytic decomposition reaction involving a neutral liquid


Differentiate between the following:

Thermal decomposition and thermal dissociation.


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


Photolysis is a decomposition reaction caused by ______


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


Which one of the following processes involves chemical reactions?


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.


Complete the following reaction:

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


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