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प्रश्न
A chemical reaction is often accompanied by external indications or characteristics.
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उत्तर
A chemical reaction is accompanied by a change in colour of reactants and products
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संबंधित प्रश्न
Name the type of chemical reaction shown by the following equation:
NaOH + HCl → NaCl + H2O
State the original colour of the following substance and colour of residue obtained after heating.
Zinc carbonate
Give a chemical test to distinguish between the following gases.
CO2 and SO2
Distinguish by heating the following in dry test tubs.
Ammonium Chloride and iodine.
Write your observation and a balanced equation in the case of the following substances being heated.
Copper nitrate.
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 hydrochloric acid to silver nitrate.
Complete the table given below.
| Addition of dil. H2SO4 to zinc | Test for gas evolved |
Give two examples where a chemical reaction is accompanied by a change in colour of the reactants and products on completion of the reaction.
Explain the following statement: Digestion is a chemical change.
The reaction of H2 gas with oxygen gas to form water is an example of ______.
