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What do you understand by exothermic reactions?

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प्रश्न

What do you understand by exothermic reactions?

अति संक्षिप्त उत्तर
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उत्तर

An exothermic reaction is a chemical reaction that produces heat along with products.

\[\ce{CaO + H2O -> Ca(OH)2 + Heat}\]

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अध्याय 1: Chemical Reactions and Equations - Exercise 1 [पृष्ठ ३१]

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लखमीर सिंग Chemistry Part 2 [English] Class 10
अध्याय 1 Chemical Reactions and Equations
Exercise 1 | Q 35. (a) (i) | पृष्ठ ३१

वीडियो ट्यूटोरियलVIEW ALL [4]

संबंधित प्रश्न

How will you indicate the following effect in a chemical equation?

A solution made in water.


Translate the following statement into a chemical equation and then balance the equation:

Barium chloride reacts with zinc sulphate to give zinc chloride and barium sulphate.


What are the various ways in which a chemical equation can be made more informative? Give examples to illustrate your answer.


Substitute formulae for names and balance the following equation:

Calcium carbonate reacts with hydrochloric acid to produce calcium chloride, water and carbon dioxide gas.


Write a balanced chemical equation with state symbols for the following reaction:

Sodium hydroxide solution reacts with hydrochloric acid solution to produce sodium chloride solution and water.


Balance the following chemical equation:

\[\ce{Pb(NO3)2_{(s)} ->[Heat] PbO_{(s)} + NO2_{(g)} + O2_{(g)}}\]


Express the following facts in the form of a balanced chemical equation:

“When a strip of copper metal is placed in a solution of silver nitrate, metallic silver is precipitated and a solution containing copper nitrate is formed”.


What happens when silver nitrate solution is added to sodium chloride solution?

  1. Write the equation for the reaction which takes place.
  2. Name the type of reaction involved.

Write word equation for the following skeletal equation:

\[\ce{AgBr -> Ag + Br2}\]


What information does the following chemical equation convey?

Zn + H2SO4 → ZnSO4+ H2


Choose the correct alternative and rewrite the following sentence.

Which of the following is not required to find the pH of a given solution? 


Identify the type of reaction taking place of the following case and write the balanced chemical equation of the reaction:
Zinc reacts with silver nitrate to produce zinc nitrate and silver.


In certain reaction a change of state is observed i.e. solid to liquid, liquid to gas etc. – State the change of state of the products – to give the respective reactant.

2H2 + O2 → 2H2O


Give one example in the case where supplying energy [given below] is necessary for a chemical reaction.

Heat energy


Write word equation for the following chemical reaction given below. Also state the observation seen in the case.

Pb(NO3)2 + 2NH4OH → 2NH4N03 + Pb(OH)2↓


Balance the following simple equation:

KHCO3 →  K2CO3   +    H2O   +   CO2


Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.

6NaOH + 3Cl2 → 6NaCl + NaClO3 + 3H2O


Which of the following is not a physical change?


Three beakers labelled as A, B and C each containing 25 mL of water were taken. A small amount of NaOH, anhydrous CuSO4 and NaCl were added to the beakers A, B and C respectively. It was observed that there was an increase in the temperature of the solutions contained in beakers A and B, whereas in case of beaker C, the temperature of the solution falls. Which one of the following statement(s) is(are) correct?

  1.  In beakers A and B, exothermic process has occurred.
  2. In beakers A and B, endothermic process has occurred.
  3. In beaker C exothermic process has occurred.
  4.  In beaker C endothermic process has occurred.

What is a reactant in a chemical equation?


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