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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 8

Differentiate Between the Following: Thermal Decomposition and Thermal Dissociation.

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प्रश्न

Differentiate between the following:

Thermal decomposition and thermal dissociation.

अंतर स्पष्ट करें
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उत्तर

Thermal decomposition and thermal dissociation.
Decomposition of a compound on heating into two elements or element and compound or into two new compounds. It is an irreversible reaction.
Thermal dissociation is the decomposition of a substance into two or more simpler substances on heating but the reaction is reversible.
\[\ce{NH4Cl⇌[Heat][Cool]NH3 + HCl}\]

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अध्याय 6: Chemical Reactions - Objective type questions

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विराफ जे दलाल Simplified Middle School Chemistry [English] Class 8 ICSE
अध्याय 6 Chemical Reactions
Objective type questions | Q 4.1

संबंधित प्रश्न

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


Rewrite the following statements by selecting the correct options:
\[\ce{CaCO3 ->[\Delta] CaO + CO2 ^}\] is a __________ reaction.


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.

What type of reaction is represented by the following equation?

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


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

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


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 student wants to study a decomposition reaction by taking ferrous sulphate crystals. Write two precautions he must observe while performing the experiment. 


Explain the reaction given in the figure.


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")`


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).

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