Advertisements
Advertisements
प्रश्न
Explain the following reaction with one suitable example of Decomposition reaction
Advertisements
उत्तर
Decomposition reaction : In this reaction a substance breaks up on heating to form two or more simpler substances, e.g. Electrolysis of water.
APPEARS IN
संबंधित प्रश्न
Complete and balance the following chemical equations:
Fe `"SO"_4` + NaOH `→`
(aq.) (aq.)
FILL IN THE BLANK
A .............. change is a temporary change.
TRUE \ FALSE
Evaporation of water is a physical change. True or false ?
What are biocatalysts ?
What do you observe when :
an iron nail is kept in tap water for few days
Explain the following reaction with one suitable example of Displacement reaction.
State the main characteristics of chemical reactions. Give at least one example in each case.
Complete and balance the following reaction:
\[\ce{NH3 + O2 ->[\Delta]}\]
Give a chemical test to distinguish between the following gases.
SO2 and Cl2
Give reason for the following:
Electrolytic decomposition of water is a reaction involving change of state.
Give reason for the following:
A characteristic change of colour is seen when a piece of iron is added to copper [II] sulphate solution.
Give balanced equation for the following conversion affected by heat alone on the substance:
Hydrated copper sulphate to sulphur dioxide
Give two examples where a chemical reaction is accompanied by a change in colour of the reactants and products on completion of the reaction.
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 the conversion of a soluble lead salt to an insoluble lead salt – formed as a white precipitate.
Select the correct answer from the options given below:
State the gaseous product formed, when
An active metal reacts with dilute sulphuric acid.
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Do you think formation of rust from iron is a chemical 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.
Write a word equation for the chemical change, if any.
Beating an egg to make a cake is a ______.
Match the following:
| Column I | Column II | ||
| 1. | Burning of coal | a. | Rusting |
| 2. | Painting of a surface | b. | Evaporation |
| 3. | Dipping iron in the water | c. | Chemical change |
| 4. | Salt from seawater | d. | Prevention of rusting |
