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प्रश्न
Give one example in the case where supplying energy [given below] is necessary for a chemical reaction.
Heat energy
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उत्तर
Heat Energy:
On heating the reactants – the reacting particles, collide swiftly and with greater intensity.
Example:
Heat on zinc carbonate:
\[\ce{ZnCO3 ->[\triangle] ZmO + CO2 [g]}\]
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संबंधित प्रश्न
Balance the given equation:
H2O2 
H2O + O2
Giving examples, state the difference between balanced and unbalanced chemical equations.
State the various characteristics of chemical reactions.
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:
\[\ce{KNO3 -> KNO2 + O2}\]
Write symbolic representation for the following word equation and balance them :
Iron + Sulphur → Iron sulphide.
\[\ce{MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2}\]
0.02 moles of pure MnO2 is heated strongly with conc. HCl. Calculate moles of salt formed.
When a potassium iodide solution is added to a solution of lead (II) nitrate in a test tube, a precipitate is formed.
Write the balanced chemical equation for this reaction.
Name the following:
The gas evolved when a dilute acid is added to chalk [limestone].
Balance the following simple equation:
ZnS + O2 → ZnO + SO2
