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Is Electrolysis of Water an Endothermic Reaction Or an Exothermic Reaction? - Science

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प्रश्न

Is Electrolysis of water an endothermic reaction or an exothermic reaction?

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उत्तर

Electrolysis of water: Endothermic reaction
Electrolysis of water needs energy to break water into hydrogen and oxygen.

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

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लखमीर सिंग Chemistry (Science) [English] Class 10
अध्याय 1 Chemical Reactions and Equations
Exercise 1 | Q 35.7 | पृष्ठ २१

वीडियो ट्यूटोरियलVIEW ALL [4]

संबंधित प्रश्न

How will you indicate Exothermic reaction in a chemical equation?


Write complete balanced equation for the following reaction:

Calcium (solid) + water (liquid)  Calcium Hydroxide (solution) + Hydrogen (gas)


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.


With the help of an appropriate example, justify that some of the chemical reactions are determined by Change in temperature.

Give chemical equation for the reaction involved in the above case.


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


Write word equation for the following skeletal equation:

\[\ce{Zn + HCl -> ZnCl2 + H2}\]


Complete the following equation:
CH4 + O2 —>


What is the valency of :

carbon in CH4


\[\ce{MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2}\]

0.02 moles of pure MnO2 is heated strongly with conc. HCl. Calculate moles of acid required.


Considering the relationship in the first pair, complete the second paie :

AgCI : White :: CuI2 : ___________


A chemical reaction is generally accompanied by certain external indications or characteristics. These include – change of – (a) colour (b) state (c) smell (d) evolution of gas (e) formation of precipitate (f) evolution or absorption of heat. With reference to change of colour – state the change in colour seen when the following are heated – mercury [II] oxide.


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

Heat energy


Name the following:

Two non-metal which react explosively when brought in close contact.


Balance the following simple equation:

Al   +   N2  →  AlN 


CaCO3 + 2HCl[dil.] → CaCl2 + H2O + CO2 [g]

State the information not conveyed by the above chemical equation. 


With reference to a chemical equation state which of the statements 1 to 5 pertain to A or B.
A: Information provided by a chemical equation. 
B: Limitations of a chemical equation.

  1. The nature of the individual elements.
  2. The speed of the reaction.
  3. The state of matter in which the substance is present.
  4. The completion of the reaction.
  5. The direction of the reaction.

Fill in the blank with the correct word from the options given below:

A chemical equation is a shorthand form for a _______ change.


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

CaC2 + N2 → 2CaCN2 + C


Balance the given chemical reaction as per the instructions below.

\[\ce{NaOH + H2SO4 -> Na2SO4 + H2O}\]

Write the number of atoms of various elements in the reactants and products.


Which of the following statements about the given reaction are correct?

`3"Fe"("s") + 4"H"_2"O"("g") -> "Fe"_3"O"_4("s") + 4"H"_2("g")`

  1.  Iron metal is getting oxidised
  2. Water is getting reduced
  3. Water is acting as reducing agent
  4.  Water is acting as oxidising agent

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