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Define: Photochemical Reaction Give One Example - Chemistry

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प्रश्न

Define:
 Photochemical reaction
Give one example 

एका वाक्यात उत्तर

उत्तर

It is a reaction which occurs with absorption of light energy.

Example: Photosynthesis

\[\ce{6CO2 + 6H2O -> C6H12O6 + 6O2}\]

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पाठ 2: Chemical Changes and Reactions - Exercise 2 (C) [पृष्ठ ३२]

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सेलिना Concise Chemistry [English] Class 9 ICSE
पाठ 2 Chemical Changes and Reactions
Exercise 2 (C) | Q 9.1 | पृष्ठ ३२

संबंधित प्रश्‍न

Complete and balance the following chemical equations:

N2 + O2  →


Complete and balance the following chemical equations:

\[\ce{Pb(NO3)2->[heat]}\] _________


MULTIPLE CHOICE QUESTIONS

Tick the most appropriate answer.

Reduction reaction is the exact opposite of

  1. displacement reaction
  2. decomposition reaction
  3. oxidation reaction
  4. none of these

TRUE \ FALSE

Copper can displace iron from iron sulphate.


TRUE \ FALSE

Evaporation of water is a physical change. True or false ?


Name three reducing agents ?


Fill in the blank:

The basic conditions necessary for a chemical reaction is _______


Give an example of a reaction where the following are involved

Electricity


What do you understand by precipitation reaction? Explain with examples.


What do you observe? When

Sodium chloride solution is added to silver nitrate solution.


Write your observation and a balanced equation in the case of the following substances being heated.

Ammonium dichromate.


Select the correct answer for the following options:

The gas obtained when potassium chlorate is heated in the presence of a catalyst.


On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.

A coloured substance which leaves on strong heating a black residue and evolves two colourless gases one of which is acidic and the other neutral.


Complete the table given below.

Heat on  Zinc nitrate Colour of residue  

State the following reaction represent oxidation or reduction.

\[\ce{H->H+}\]


A thick coating of a paste of Plaster of Paris (POP) is applied over the bandage on a fractured bone. It becomes hard on drying to keep the fractured bone immobilised. Can the change in POP be reversed?


Anaerobic bacteria digest animal waste and produce biogas (Change – A). The biogas is then burnt as fuel (Change – B). The following statements pertain to these changes. Choose the correct one.


The percentage composition of Nitrogen in Ureas is ______.


Melting of wax is a change where a solid changes to a liquid state. Give one more such change which you observe in your surroundings


We are advised to not to play with fireworks. Give reason.


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