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प्रश्न
A chemical reaction is often accompanied by external indications or characteristics.
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उत्तर
A chemical reaction is accompanied by a change in colour of reactants and products
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संबंधित प्रश्न
Fill in the blank.
Melting of ice is a _______ change.
True or false
New substances are formed in a chemical change.
Write true or false .
A black residue is formed when sugar is heated .
Write the chemical reaction where the following changes are observed.
Precipitate is formed
Give an example of the following chemical changes.
A reaction involving
(i) Change of state
(ii) formation of precipitate
Name: A greenish-yellow gas.
Distinguish by dilute sulphuric acid.
Sodium sulphide and sodium sulphite?
State the following reaction represent oxidation or reduction.
\[\ce{H->H+}\]
State the following reaction represent oxidation or reduction.
\[\ce{Al->Al+++}\]
Photosynthesis is a chemical reaction that takes place in the presence of ______.
