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प्रश्न
Write one equation for decomposition reactions where energy is supplied in the form of heat.
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उत्तर
- \[\ce{\underset{Zinc carbonate}{ZnCO3_{(s)}} ->[\Delta]\underset{Zinc oxide}{ZnO_{(s)}} + \underset{Carbon dioxide}{CO2_{(g)}}}\]
- \[\ce{\underset{(Limestone)}{\underset{Calcium carbonate}{CaCO3_{(s)}}} ->[heat] \underset{(Lime)}{\underset{Calcium oxide}{CaO_{(s)}}} + \underset{Carbon dioxide}{CO2_{(g)}}}\]
- \[\ce{\underset{(Green colour)}{\underset{Ferrous sulphate}{2FeSO4_{(s)}}} ->[heat] \underset{(Brown colour)}{\underset{Ferric oxide}{Fe2O3_{(s)}}} + \underset{dioxide}{\underset{Sulphur}{SO2_{(g)}}} + \underset{trioxide}{\underset{Sulphur}{SO3_{(g)}}}}\]
- \[\ce{\underset{Potassium chlorate}{2KClO3_{(s)}} ->[Heat][(Decomposition)] \underset{Potassium chloride}{2KCl_{(s)}} + \underset{Oxygen}{3O2_{(g)}}}\]
- \[\ce{\underset{(Colourless)}{\underset{Lead nitrate}{2Pb(NO3)2_{(s)}}} ->[Heat][(Decomposition)] \underset{(Yellow)}{2PbO_{(s)}} + \underset{(Brown fumes)}{\underset{Nitrogen dioxide}{4NO2_{(g)}}} + \underset{Oxygen}{O2_{(g)}}}\]
संबंधित प्रश्न
Why is the amount of gas collected in one of the test tubes in the following Activity double of the amount collected in the other? Name this gas.
- Take a plastic mug. Drill two holes at its base and fit rubber stoppers in these holes. Insert carbon electrodes in these rubber stoppers as shown in the following Fig.
- Connect these electrodes to a 6 volt battery.
- Fill the mug with water such that the electrodes are immersed. Add a few drops of dilute sulphuric acid to the water.
- Take two test tubes filled with water and invert them over the two carbon electrodes.
- Switch on the current and leave the apparatus undisturbed for some time.
- You will observe the formation of bubbles at both the electrodes. These bubbles displace water in the test tubes.
- Is the volume of the gas collected the same in both the test tubes?
• Once the test tubes are filled with the respective gases, remove them carefully. - Test these gases one by one by bringing a burning candle close to the mouth of the test tubes.
Caution: This step must be performed carefully by the teacher.
- What happens in each case?
- Which gas is present in each test tube?
Give one example of a decomposition reaction which is carried out with electricity.
Which of the following can be decomposed by the action of light?
When a green iron salt is heated strongly, its colour finally changes to brown and odour of burning sulphur is given out.
- Name the iron salt.
- Name the type of reaction that takes place during the heating of iron salt.
- Write a chemical equation for the reaction involved.
Identify the type of following reaction :
Study the following figure and answer questions.
a) After heating Calcium carbonate, which gas is formed in a test tube?
b) When we pass this gas through limewater what change, did you observe?
c) Write down the chemical reaction showing the product formation after heating the Calcium carbonate.
How can the rate of the chemical reaction, namely, decomposition of hydrogen peroxide be increased?
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\[\ce{2KClO3(s)->[\Delta] 2KCl(aq) + 3O2(g)}\]
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- Direct combination
- Decomposition
- Displacement
- Double decomposition
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Decomposition of silver salts in the presence of sunlight is an example of _________.
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Electrolytic decomposition and photochemical decomposition.
What is electrolysis?
Electrolysis is type of ______ reaction.
Chemical volcano is an example of ______ type of reaction.
Assertion: Decomposition of vegetable matter into compost is an endothermic reaction.
Reason: Decomposition reaction involves breakdown of a single reactant into simpler products.
On heating blue coloured powder of copper (II) nitrate, in a boiling tube, copper oxide (black), oxygen gas and a brown gas X is formed
- Write a balanced chemical equation of the reaction.
- Identify the brown gas X evolved.
- Identify the type of reaction.
- What could be the pH range of aqueous solution of the gas X?
When lead nitrate is heated strongly in a boiling tube, two gases are liberated and a solid residue is left behind in the test tube.
- Name the type of chemical reaction and define it.
- Write the name and formula of the coloured gas liberated.
- Write the balanced chemical equation for the reaction.
- Name the residue left in the test tube and state the method of testing its nature (acidic/basic).
Write the molecular formula of calcium carbonate.
