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प्रश्न
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 |
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उत्तर
| a. | Photosynthesis | iii. | Chemical change |
| b. | Water | iv. | Covalent bond |
| c. | Sodium chloride | v. | Ionic bond |
| d. | Dissolution of salt in water | vi. | Physical change |
| e. | Carbon | ii. | Reactant in combustion process |
| f. | Fluorine | vii. | Tendency to form anion |
| g. | Magnesium | i. | Tendency to lose electrons |
संबंधित प्रश्न
How do the following help in bringing about a chemical change?
catalyst .
TRUE \ FALSE
Temperature at which a liquid starts boiling is known as the boiling point of that liquid. True or false ?
Give reason for the following:
Colourless concentrated sulphuric acid in a test tube changes to blue on adding a small piece of copper to it.
Complete and balance the following reaction:
NaCl(aq) + AgNO3(aq) →
Select the correct answer for the following options:
The basic gas obtained when two gases react in presence of a catalyst and the reaction is exothermic.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Lead nitrate.
Classify the following as physical or chemical properties
Most metal oxides form alkalis on interacting with water.
Heat may evolve or be absorbed during a ______ change.
______ occurs in the absence of air and in the presence of micro-organisms such as yeast.
______ are substances that speed up the process of a chemical change and it will not undergo any change during the course of the reaction.
