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

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

व्हिडिओ ट्यूटोरियलVIEW ALL [4]

संबंधित प्रश्‍न

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A solution made in water.


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\[\ce{Calcium (solid) + Water (liquid) -> Calcium hydroxide (solution) + Hydrogen (gas)}\]


Giving examples, state the difference between balanced and unbalanced chemical equations.


When potassium nitrate is heated, it decomposes into potassium nitrite and oxygen. Write a balanced equation for this reaction and add the state symbols of the reactants and products.


State one characteristic of the chemical reaction which takes place when lemon juice is added gradually to the potassium permanganate solution.


You are given the solution of lead nitrate. In order to obtain a yellow precipitate you should mix with it a solution of ______.


Balance the following equation. Also name the product formed.

PbCO3    →   PbO +CO2


Explain the terms with examples.

Balanced equation


Write the chemical equation for the following word equation and balance them.

Sodium reacts with water to form sodium hydroxide and hydrogen


Balance the following equation:

Fe2O3 + CO → Fe + CO2


(a) Give only one suitable chemical test to identify the following gases.

  1. Ammonia
  2. Sulphur dioxide
  3. Hydrogen Chloride
  4. Chlorine
  5. Carbon Dioxide
  6. Oxygen
  7. Hydrogen

(b) Select a basic gas mentioned in Q.1 (a). How is the basic nature suspected?

(c)Select acidic gases from the gases mentioned in Q.1 (a). How is the acidic nature suspected?

(d) State the gas responsible for bleaching action.

(e)Which gas turn blue cobalt chloride paper light pink?

 


Define: Endothermic reaction 


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\[\ce{2SO2 + O2 ⇌[V2O5][450°C] 2SO3}\]


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FeCl2   +   Cl2  →  FeCl3 


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\[\ce{Ca(OH)2 + HNO3 -> Ca(NO3)2 + H2O}\]


Write a balanced equation for the following word equation:

Potassium nitrate → Potassium nitrite + Oxygen


Give a balanced equation by partial equation method, [steps are given below].

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  1. Ammonia first reacts with chlorine to give hydrogen chloride and nitrogen.
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Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.

Cl2 + 2H2O + SO2 → 4HCl + H2SO4


Which of the following are exothermic processes?

  1. Reaction of water with quick lime
  2. Dilution of an acid
  3. Evaporation of water
  4.  Sublimation of camphor (crystals)

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