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Question
Complete the following statement.
On heating, hydrated copper sulphate changes its colour from ________ to __________.
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Solution
On heating, hydrated copper sulphate changes its colour from Blue to white.
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- Endothermic reactions
- None of these
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A photochemical reaction involving silver salt.
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Give a balanced equation for the following type of reaction:
A catalytic, reversible, exothermic reaction.
Differentiate between the following:
Electrolytic decomposition and photochemical decomposition.
Respiration is a ______ change.
The Dissolution of glucose in water is also an ______ change.
Match the following:
| Colum I | Column II | ||
| 1. | Alloying | a. | Exothermic change |
| 2. | Crystallization | b. | Periodic change |
| 3. | Soap powder + water | c. | Mixing of molten solids |
| 4. | Seasonal changes | d. | Pure solid |
Give scientific reasons.
While preparing dilute sulphuric acid from concentrated sulphuric acid in the laboratory, the concentrated sulphuric acid is added slowly to water with constant stirring.
Give a scientific reason.
While preparing dilute sulphuric acid from concentrated sulphuric acid in the laboratory, the concentrated sulphuric acid is added slowly to water with constant stirring.
