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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 are (i) positive catalysts and (ii) negative catalysts? Support your answer with one example for each of them.
State what you would observe when the following substance is heated in a glass test tube Copper (II) carbonate Red lead .
Out of sodium and sulphur which is a metal? Explain its reaction with the oxygen.
Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.
(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)
Electron ______ is complete in each hydrogen in a hydrogen molecule.
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Hydrogen chloride
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.
State the original colour of the following substance and colour of residue obtained after heating.
Copper carbonate
State the original colour of the following substance and colour of residue obtained after heating.
Lead nitrate
Give a chemical test to distinguish between the following gases.
H2 and CO2
Write your observation and a balanced equation in the case of the following substances being heated.
Copper nitrate.
What is a chemical reaction?
Complete the table given below.
| Addition of dil. H2SO4 to KHCO3 | Name of residue obtained |
Which of the following is not an “element + element → compound” type reaction?
Burning of paper is the best example of ______ change.
Classify the following as physical or chemical properties
Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas.
On heating calcium carbonate gets converted into calcium oxide and carbon dioxide.
(a) Is this a physical or a chemical change?
(b) Can you prepare one acidic and one basic solution by using the products formed in the above process? If so, write the chemical equation involved.
The chemical formula of rust is ______.
Explain how the painting of an iron gate prevents it from rusting.
Photosynthesis is a chemical charge. Justify your answer.
Acid rain is a result of ______.
