Advertisements
Advertisements
प्रश्न
Write one equation for decomposition reactions where energy is supplied in the form of heat.
Advertisements
उत्तर
- \[\ce{\underset{Zinc carbonate}{ZnCO3_{(s)}} ->[\Delta]\underset{Zinc oxide}{ZnO_{(s)}} + \underset{Carbon dioxide}{CO2_{(g)}}}\]
- \[\ce{\underset{(Limestone)}{\underset{Calcium carbonate}{CaCO3_{(s)}}} ->[heat] \underset{(Lime)}{\underset{Calcium oxide}{CaO_{(s)}}} + \underset{Carbon dioxide}{CO2_{(g)}}}\]
- \[\ce{\underset{(Green colour)}{\underset{Ferrous sulphate}{2FeSO4_{(s)}}} ->[heat] \underset{(Brown colour)}{\underset{Ferric oxide}{Fe2O3_{(s)}}} + \underset{dioxide}{\underset{Sulphur}{SO2_{(g)}}} + \underset{trioxide}{\underset{Sulphur}{SO3_{(g)}}}}\]
- \[\ce{\underset{Potassium chlorate}{2KClO3_{(s)}} ->[Heat][(Decomposition)] \underset{Potassium chloride}{2KCl_{(s)}} + \underset{Oxygen}{3O2_{(g)}}}\]
- \[\ce{\underset{(Colourless)}{\underset{Lead nitrate}{2Pb(NO3)2_{(s)}}} ->[Heat][(Decomposition)] \underset{(Yellow)}{2PbO_{(s)}} + \underset{(Brown fumes)}{\underset{Nitrogen dioxide}{4NO2_{(g)}}} + \underset{Oxygen}{O2_{(g)}}}\]
APPEARS IN
संबंधित प्रश्न
What does one mean by exothermic reaction? Give example.
Why are decomposition reactions called the opposite of combination reactions? Write equations for these reactions.
What type of reaction is represented by the following equation?
\[\ce{NH4Cl -> NH3 + HCl}\]
What type of chemical reaction takes place when limestone is heated?
What type of chemical reaction is represented by the following equation?
\[\ce{X -> Y + Z}\]
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Thermal decomposition of a substance is brought about with the help of
- reactants
- water
- wind
- heat
What are thermal decomposition reactions ? Explain with an example.
Give a scientific reason.
When the gas formed on heating limestone is passed through freshly prepared lime water, the lime water turns milky.
Identify the type of following reaction :
How can the rate of the chemical reaction, namely, decomposition of hydrogen peroxide be increased?
Differentiate between direct combination reaction and a decomposition reaction.
Give a balanced equation for the following type of reaction:
A thermal decomposition reaction in which a metallic nitrate decomposes to give – a basic oxide.
The chemical reaction in which two or more products are formed from a single reactant is called ______ reaction.
What is electrolysis?
Photolysis is a decomposition reaction caused by ______
Chemical volcano is an example of ______ type of reaction.
The reaction of calcium carbonate, with freshly prepared lime water, is shown below:
Answer the questions with the help of a diagram:
- What type of reaction does calcium carbonate undergoes?
- What change in colour is observed in lime?
- Write the chemical equation.
These consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:
Assertion: Silver bromide decomposition is used in black and white photography.
Reason: Light provides energy for this exothermic reaction.
What is observed when silver chloride is exposed to sunlight? Give the type of reaction involved.
Write one equation for the decomposition reaction where energy is supplied in the form of electricity.
