Advertisements
Advertisements
प्रश्न
Why are decomposition reactions called the opposite of combination reactions? Write equations for these reactions.
Why are decomposition reactions called the opposite of combination reactions? Explain with equations of these reactions.
Advertisements
उत्तर
Decomposition reactions occur when a compound breaks up into two or more simpler substances. On the other hand, combination reactions occur when two or more substances combine to form a single substance. Thus, decomposition reactions are the opposite of combination reactions.
Decomposition Reactions:
\[\ce{CaCO3_{(s)} -> CaO_{(s)} + CO2_{(g)}}\]
\[\ce{2H2O_{(l)} ->[Electricity] 2H2_{(g)} + O2_{(g)}}\]
Combination Reactions:
\[\ce{2H2_{(g)} + O2_{(g)} -> 2H2O_{(l)}}\]
\[\ce{NH3_{(g)} + HCl_{(g)} -> NH4Cl_{(s)}}\]
APPEARS IN
संबंधित प्रश्न
Write the balanced chemical equation for the following and identify the type of reaction.
\[\ce{Zinc carbonate(s) -> Zinc oxide(s) + Carbon dioxide(g)}\]
What type of reaction is represented by the following equation?
\[\ce{CaCO3 -> CaCO + CO2}\]
What type of reaction is represented by the following equation?
\[\ce{2FeSO4 -> Fe2O3 + SO2 + SO3}\]
What type of reaction is represented by the following equation?
\[\ce{NH4NO2 -> N2 + 2H2O}\]
State the change in colour observed in the following case, mentioning the reason:
Silver chloride is exposed to sunlight.
How will you obtain Nitrogen dioxide from lead nitrate.
Also give balanced equations for the reactions
What is a redox reaction? Explain with an example.
What does one mean by endothermic reaction? Give example.
Give a scientific reason.
When the gas formed on heating limestone is passed through freshly prepared lime water, the lime water turns milky.
(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.
How can the rate of the chemical reaction, namely, decomposition of hydrogen peroxide be increased?
Give a balanced equation for –
A thermal decomposition reaction involving heat on limestone [calcium carbonate]
Explain the reaction given in the figure.
Give the ratio in which hydrogen and oxygen are present in water by volume.
When SO2 gas is passed through a saturated solution of H2S, which of the following reaction occurs?
Balance the following chemical equation and identify the type of chemical reaction.
`"HgO"("s") overset("(heat)")(->) "Hg"("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.
Write one equation for the decomposition reaction where energy is supplied in the form of light.
Write one equation for the decomposition reaction where energy is supplied in the form of electricity.
