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प्रश्न
Give one example in the case where supplying energy [given below] is necessary for a chemical reaction.
Light energy
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उत्तर
Light Energy:
In presence of light – the molecules of the reactants absorb light energy and collide swiftly and react rapidly.
Example:
Photosynthesis in plants:
Plants manufacture food [glucose] from carbon dioxide and water – in the presence of chlorophyll [green pigment in plants] and sunlight.
\[\ce{Carbon dioxide + water ⇌[chlorophyll][sunlight] glucose + oxygen}\]
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संबंधित प्रश्न
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\[\ce{MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2}\]
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Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.
Cl2 + 2H2O + SO2 → 4HCl + H2SO4
Three beakers labelled as A, B and C each containing 25 mL of water were taken. A small amount of NaOH, anhydrous CuSO4 and NaCl were added to the beakers A, B and C respectively. It was observed that there was an increase in the temperature of the solutions contained in beakers A and B, whereas in case of beaker C, the temperature of the solution falls. Which one of the following statement(s) is(are) correct?
- In beakers A and B, exothermic process has occurred.
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- In beaker C exothermic process has occurred.
- In beaker C endothermic process has occurred.
