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प्रश्न
Melting of wax is a change where a solid changes to liquid state. Give one more such change which you observe in your surroundings
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उत्तर
Melting of ice, melting of butter
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संबंधित प्रश्न
When carbon dioxide is passed through lime water, it turns milky due to the formation of ______.
Give a reason.
Wasp sting is treated with vinegar.
Fill in the blank
A new substance is formed in a _______ change.
Match the pairs.
| a. | Photosynthesis | i. | Tendency to lose electrons |
| b. | Water | ii. | Reactant in combustion process |
| c. | Sodium chloride | iii. | Chemical change |
| d. | Dissolution of salt in water | iv. | Covalent bond |
| e. | Carbon | v. | Ionic bond |
| f. | Fluorine | vi. | Physical change |
| g. | Magnesium | vii. | Tendency to form anion |
Give reason for the following:
Molybdenum is used in the manufacture of ammonia.
State the type of reactions for the following represent and balance the ones that are not balanced.
Cl2 + 2KBr → 2KCl + Br2
Give a chemical test to distinguish between the following gases.
CO2 and SO2
Complete the table given below.
| Addition of dil. H2SO4 to KHCO3 | Name of residue obtained |
When lithium metal is placed in hydrochloric acid, _______ gas is evolved.
Define the following term:
Chemical change
