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प्रश्न
Complete the table given below.
| Addition of dil. H2SO4 to KHCO3 | Name of residue obtained |
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उत्तर
| Addition of dil. H2SO4 to KHCO3 | Name of residue obtained | K2SO4 Residue is potassium sulphate |
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संबंधित प्रश्न
Define precipitation reaction.
What are homogenous reactions ?
Explain the type of reactions on the basis of the direction of reaction.
Write your observation and a balanced equation in the case of the following substances being heated.
Ammonium dichromate.
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 acid to an active metal.
Give balanced equation for the following conversion affected by heat alone on the substance:
Zinc carbonate to zinc oxide
Complete the table given below.
| Heat on copper carbonate | Test for gas evolved |
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Lead nitrate.
Classify each of the following, as a physical or a chemical change. Give reasons.
(a) Drying of a shirt in the sun.
(b) Rising of hot air over a radiator.
(c) Burning of kerosene in a lantern.
(d) Change the colour of black tea by adding lemon juice to it.
(e) Churning of milk cream to get butter.
