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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
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Formation of manure from leaves is a physical change.
Changes in which new substances are formed are called ______ changes.
How do the following help in bringing about a chemical change?
heat.
Complete and balance the following chemical equations:
`"H"_2"S"` + `"CI"_2` `→`
Complete and balance the following chemical equations:
Ba`"CI"_2` + `"H"_2"SO"_4` `→`
(aq.) (aq.)
Give reason .
A person suffering from acidity is advised to take an antacid.
Fill in the blank:
In some chemical reactions an insoluble ________ is formed when two solutions are mixed.
Write true or false :
No new substance is formed during a chemical reaction.
Choose the correct option from the bracket and explain the statement giving reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition)
The conversion of ferrous sulphate to ferric sulphate is ______ reaction.
What do you observe when HCI is passed through a silver nitrate solution.
Give a word equation for the following reaction.
An exothermic reaction where both the reactants are gases, one of which is oxygen.
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.
Give balanced equation for the following conversion affected by heat alone on the substance:
Ammonium dichromate to nitrogen
State the following reaction represent oxidation or reduction.
\[\ce{H->H+}\]
Give a suitable example with an equation to show the representation of a chemical reaction.
______ gas causes tears in our eyes while cutting onions.
NPK are the primary nutrients for plants.
A reaction between an acid and a base is called ______.
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?
Explain how the painting of an iron gate prevents it from rusting.
