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प्रश्न
Give a reason.
Wasp sting is treated with vinegar.
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उत्तर
Wasp stings are alkaline and they can be neutralized by vinegar which is a weak acid.
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संबंधित प्रश्न
What do you observe when iron nail is kept in copper sulphate solution for sometime.
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Write true or false :
No new substance is formed during a chemical reaction.
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Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.
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Give reason for the following:
Silver nitrate solution is kept in coloured bottles.
Give reason for the following:
Blue solution of copper sulphate changes to green when a piece of iron is added to this solution.
Give an example of a photochemical reaction.
Give a word equation for the following reaction.
Two gases which combine to give a solid.
Give a balanced equation for a reaction involving the evolution of gas on the addition of dilute acid to sodium sulphite.
Give a balanced equation for a reaction involving the evolution of gas on the addition of dilute acid to calcium carbonate.
Burning of paper is a ______ change.
Water boiling into water vapour is an example of chemical change.
The water we drink is a combination of hydrogen and oxygen.
Classify the following processes into physical or chemical changes:
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- Digestion of food.
- Cutting of a log of wood into pieces.
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Write the chemical reaction of baking soda with lemon.
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Reason (R): Physical changes are always reversible.
