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प्रश्न
Write one equation for the decomposition reaction where energy is supplied in the form of electricity.
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उत्तर
- \[\ce{\underset{(Molten)}{\underset{Aluminium oxide}{2Al2O3_{(l)}}} ->[Electricity][Decomposition] \underset{Aluminium metal}{4Al_{(l)}} + \underset{Oxygen}{3O2_{(g)}}}\]
- \[\ce{\underset{Water}{2H2O_{(l)}} ->[electricity][(Decomposition)] \underset{Hydrogen}{2H2_{(g)}} + \underset{Oxygen}{O2_{(g)}}}\]
- \[\ce{\underset{(Molten)}{\underset{Sodium chloride}{2NaCl_{(l)}}} ->[Electricity][(Decomposition)] \underset{Sodium metal}{2Na_{(s)}} + \underset{Chlorine gas}{Cl2_{(g)}}}\]
संबंधित प्रश्न
Why are decomposition reactions called the opposite of combination reactions? Write equations for these reactions.
Taking into consideration the relationship in the first pair, complete the second pair
2H2 + O2 → 2H2O :Combination Reaction :: 2HgO → 2Hg + O2:_________
Rewrite the following statements by selecting the correct options:
\[\ce{CaCO3 ->[\Delta] CaO + CO2 ^}\] is a __________ reaction.
Give one example of a decomposition reaction which is carried out by applying heat.
What type of chemical reaction takes place when silver bromide is exposed to sunlight?
What type of chemical reaction takes place when electricity is passed through water?
What type of reaction is represented by the following equation?
\[\ce{NH4NO2 -> N2 + 2H2O}\]
What is meant by a decomposition reaction?
Two metals X and Y form the salts XSO4 and Y2SO4, respectively. The solution of salt XSO4 is blue in colour whereas that of Y2SO4 is colourless. When barium chloride solution is added to XSO4 solution, then a white precipitate Z is formed along with a salt which turns the solution green. And when barium chloride solution is added to Y2SO4 solution, then the same white precipitate Z is formed along with colourless common salt solution.
- What could the metals X and Y be?
- Write the name and formula of salt XSO4.
- Write the name and formula of salt Y2SO4.
- What is the name and formula of white precipitate Z?
- Write the name and formula of the salt which turns the solution green in the first case.
How will you obtain Nitrogen dioxide from lead nitrate.
Also give balanced equations for the reactions
(a) Design an activity to demonstrate the decomposition reaction of lead nitrate.
(b) Draw labelled diagram of the experimental set-up. List two main observations.
(c) Write balanced chemical equation for the reaction stating the physical state of the reactant and the products.
Answer the following question.
2 g of silver chloride is taken in a china dish and the china dish is placed in sunlight for some time. What will be your observation in this case? Write the chemical reaction involved in the form of a balanced chemical equation. Identify the type of chemical reaction.
Classify the following reaction into –
- Direct combination
- Decomposition
- Displacement
- Double decomposition
The reaction is – Zinc hydroxide on heating gives zinc oxide and water.
Complete the statement by filling in the blank with the correct word:
Decomposition of silver salts in the presence of sunlight is an example of _________.
Balance the following chemical equation and identify the type of chemical reaction.
`"HgO"("s") overset("(heat)")(->) "Hg"("l") + "O"_2("g")`
Balance the following chemical equation and identify the type of chemical reaction.
`"H"_2"O"_2("l") overset("U V")(->) "H"_2"O"("l") + "O"_2("g")`
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 light.
