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प्रश्न
Give an example of a chemical reaction for the following situation:
A change in colour is observed
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उत्तर
Reaction between copper sulphate and iron metal – blue solution of copper sulphate changes to the green solution of ferrous sulphate.
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संबंधित प्रश्न
Fill in the blanK
A .............is a substance which changes the rate of a chemical reaction without undergoing a chemical change.
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Melting of ice is a _______ change.
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A new substance is formed in a _______ change.
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The substances which undergo chemical change are called _______
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The basic conditions necessary for a chemical reaction is _______
Name affects the acidified K2Cr2O7 paper and also turns lime water dirty milky.
Give a word equation for the following reaction.
A salt which reacts with ammonium hydroxide to give a reddish brown precipitate.
A chemical reaction is often accompanied by external indications or characteristics which include –
- Colour change
- Effervescence or gas evolved
- Evolution or absorption of heat
- Formation of a precipitate.
With reference to each of the above indications, state the external indication seen during – Addition of dilute acid to an active metal.
Which of the following statement is incorrect for a chemical reaction?
Define the following term:
Chemical change
