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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 8

How Do the Following Help in Bringing About a Chemical Change? Light.

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प्रश्न

How do the following help in bringing about a chemical change?

light.

एका वाक्यात उत्तर
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उत्तर

Some chemical reactions can take place in the presence of light. Ex. Photosynthesis.

\[\ce{6CO2 + 6H2O⇌[sunlight][Chlorophyll]\underset{\text{glucose}}{C6H12O6 +6O2}}\]

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पाठ 6: Chemical Reactions - Exercise 1 [पृष्ठ ७३]

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एस.पी. सिंह Concise Chemistry [English] Class 8 ICSE
पाठ 6 Chemical Reactions
Exercise 1 | Q 3.2 | पृष्ठ ७३

संबंधित प्रश्‍न

State whether the following statement is true or false. In case a statement is false, write the corrected statement.

Iron and rust are the same substances. 


How is precipitate formation in a chemical reaction indicated?


Define chemical reaction.


State what you would observe when the following substance is heated in a glass test tube Copper (II) carbonate Red lead .


Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.

(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)

Electron ______ is complete in each hydrogen in a hydrogen molecule.


Give an example of the following chemical change.

Two solids combine to form a liquid


State the type of reactions for the following represent and balance the ones that are not balanced.

Cl2 + 2KBr → 2KCl + Br2 


Name: Two carbonates do not produce carbon dioxide on heating.


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

Ammonium chloride 


Select the correct answer for the following options:

The pale blue precipitated obtained when copper [II] sulphate reacts with sodium hydroxide.


Give balanced equation for the following conversion affected by heat alone on the substance:

Zinc nitrate to nitrogen dioxide


Limestone contains ______ mainly.


Photosynthesis is a chemical reaction that takes place in the presence of ______.


Silver articles turning black: ______:: Boiling of H2O: physical change ______.


Which of the following is a chemical change?


Give an example of a chemical reaction for the following situation:

A change in colour is observed


If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.

Can you change rust back into iron by some simple method?


Iron and rust are the same substances.


Write five changes in the characteristics of a substance that can take place during a chemical change. 


Collect information about the types of fuels used for cooking in your area. Discuss with your teachers/parents/others which fuels are less polluting and why.


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