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What Do You Understand by Exothermic Reactions? - Science

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प्रश्न

What do you understand by exothermic reactions?

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उत्तर

Exothermic reaction is the chemical reaction that produces heat along with products.

Example:  CaO + H2O → Ca(OH)2 + Heat

 

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पाठ 1: Chemical Reactions and Equations - Exercise 1 [पृष्ठ २१]

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लखमीर सिंह Chemistry (Science) [English] Class 10
पाठ 1 Chemical Reactions and Equations
Exercise 1 | Q 35.1 | पृष्ठ २१

व्हिडिओ ट्यूटोरियलVIEW ALL [4]

संबंधित प्रश्‍न

Translate the following statement into chemical equation and then balance it.

Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate.


Balance the following equation:

Na + O2  Na2O


Balance the given equation:

NH3 + CuO  Cu +N2 +H2O


Balance the gievn equation:

NaOH + H2SO4  Na2SO4 + H2O


Write balanced chemical equation from the following information:
An aqueous calcium hydroxide solution (lime water) reacts with carbon dioxide gas to produce a solid calcium carbonate precipitate and water.


Balance the following equation and add state symbols:

Zn  +  HCI →  ZnCI2  +  H2

 


Write the balanced equation for the following reaction, and add the state symbols:

Sodium hydroxide reacts with sulphuric acid to produce sodium sulphate and water.


Give one example of a chemical reaction characterised by change in state.


The chemical reaction between quicklime and water is characterised by:
(a) evolution of hydrogen gas
(b) formation of slaked lime precipitate
(c) change in temperature of mixture
(d) change in colour of the product


When the solution of substance X is added to a solution of potassium iodide, then a yellow solid separates out from the solution.
(a) What do you think substance X is likely to be?
(b) Name the substance which the yellow solid consists of.
(c) Which characteristic of chemical reaction is illustrated by this example?
(d) Write a balanced chemical equation for the reaction which takes place. Mention the physical states of all the reactant and products involved in the chemical equation.


Balance the following chemical equation:


Why do we need to balance chemical equations?


Balance the following chemical equation :

H2 + O2   →  H2O


In electrolysis of water, why is the volume of gas collected over one electrode double that of gas collected over the other electrode?


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

Carbon   + Oxygen → Carbon dioxide


Why should an equation be balanced? Explain with the help of a simple equation.


Answer the following question.
What is observed when 2 mL of dilute hydrochloric acid is added to 1 g of sodium carbonate taken in a clean and dry test tube? Write a chemical equation for the reaction involved.


Balance the following simple equation:

N2   +   O2  ⇌  NO


Balance the following simple equation:

CaO  +  HCl  →  CaCl2  +  H2


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

CaC2 + N2 → 2CaCN2 + C


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