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प्रश्न
How do the following help in bringing about a chemical change?
light.
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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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संबंधित प्रश्न
Complete and balance the following chemical equations:
`"H"_2"S"` + `"CI"_2` `→`
FILL IN THE BLANK
........... electrolytes dissociate completely in aqueous state and allow large amount of electricity to flow through it.
Name three reducing agents ?
Fill in the blank
A change in which the substance can be brought back to its original state is called a _______ change.
Define chemical reaction.
Give an example of a reaction where the following are involved
Catalyst
Write the chemical reaction where the following changes are observed.
Physical state is changed
Give reason for the following:
Silver nitrate solution is kept in coloured bottles.
Name: A brown gas
State the original colour of the following substance and colour of residue obtained after heating.
Copper carbonate
What do you observe when H2S is passed through a lead nitrate solution.
What do you observe when dilute sulphuric acid is added to the following:
Sodium Sulphide
Give balanced equation for the following conversion affected by heat alone on the substance:
Hydrated copper sulphate to sulphur dioxide
Complete the table given below.
| Heat on Zinc nitrate | Colour of residue |
Complete the table given below.
| Heat on sodium chloride | Colour imparted to flame during flame test |
State the following reaction represent oxidation or reduction.
\[\ce{Cu++->Cu}\]
Two chemical species X and Y combine together to form a product P which contains both X and Y
\[\ce{X + Y -> P}\]
X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following concerning the species X, Y and P are correct?
(i) P is a compound
(ii) X and Y are compounds
(iii) X and Y are elements
(iv) P has a fixed composition
Beating an egg to make a cake is a ______.
Write the equation for the process of formation of rust.
______ is the chemical name of rust.
