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प्रश्न
Explain the following reaction with one suitable example of Displacement reaction.
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उत्तर
Displacement reaction: In this reaction a more reactive element displaces a less reactive element from its compound, e.g. Reaction of iron with copper sulphate.
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संबंधित प्रश्न
Changes in which new substances are formed are called ______ changes.
What are (i) positive catalysts and (ii) negative catalysts? Support your answer with one example for each of them.
Give a reason.
Wasp sting is treated with vinegar.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Which one of the following alters the rate of the chemical reaction without itself undergoing any change?
- temperature and Pressure
- concentration of reactants
- presence of catalyst
- none of these
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Miscible liquids having slightly different boiling points can be separated by the
- evaporation
- distillation
- fractional distillation
- sedimentation
Write the chemical reaction where the following changes are observed.
Precipitate is formed
Explain,giving one example of the following chemical changes:
Reversible reaction
Give an example of the following chemical changes.
A reaction involving
(i) Change of state
(ii) formation of precipitate
Name the gases which turn moist red litmus blue.
Distinguish by heating the following in dry test tubs.
Copper Sulphate and copper carbonate
Distinguish by heating the following in dry test tubs.
Ammonium Chloride and iodine.
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.
Complete the table given below.
| Heat on ammonium dichromate | Name of neutral gas evolved |
Burning of paper is the best example of ______ change.
A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.
Are these changes chemical in nature?
Rusting of iron is ______.
______ occurs in the absence of air and in the presence of micro-organisms such as yeast.
Give an example where heat, light, and sound are produced during a chemical change.
Write a note on the following:
Fermentation
______ is a chemical substance is used in whitewashing.
