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प्रश्न
Give a word equation for the following reaction.
A salt which reacts with ammonium hydroxide to give a reddish brown precipitate.
उत्तर
Ferric chloride + Ammonium hydroxide → Ferric hydroxide (reddish brown precipitate) + Ammonium chloride
\[\ce{FeCl3 + 3NH4OH -> Fe(OH)3↓ + 3NH4Cl}\]
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संबंधित प्रश्न
How would you show that setting of curd is a chemical change?
The gas we use in the kitchen is called liquefied petroleum gas (LPG). In the cylinder, it exists as a liquid. When it comes out from the cylinder it becomes a gas (Change − A), then it burns (Change − B). The following statements pertain to these changes. Choose the correct one.
Give one example that illustrates the following characteristics of a chemical reaction:
Change in state
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Miscible liquids having slightly different boiling points can be separated by the
- evaporation
- distillation
- fractional distillation
- sedimentation
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The new substances formed during a chemical reaction are called the ..................
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Melting of ice is a _______ change.
Name the type of chemical reaction shown by the following equation:
2Mg + O2 → 2MgO
Name the type of chemical reaction shown by the following equation:
Fe + CuSO4 → FeSO4 + Cu
What is the reaction called when oxidation and reduction take place simultaneously? Explain with one example.
| Reactants | Products | Type of chemical reaction |
| BaCl2(aq) + ZnSO4(aq) | H2CO3(aq) | Displacement |
| 2AgCl(s) | FeSO4(aq) + Cu(s) | Combination |
| CuSO4(aq) + Fe(s) | BaSO4↓ + ZnCl2(aq) | Decomposition |
| H2O(l) + CO2(g) | 2Ag(s) + Cl2(g) | Double displacement |
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Give an example of a reaction where the following are involved
Light
Give an example of a reaction where the following are involved:
Solution
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The pale blue precipitated obtained when copper [II] sulphate reacts with sodium hydroxide.
Name the following:
The products obtained during ‘photosynthesis’ – which is a chemical change.
Give balanced equation for the following conversion affected by heat alone on the substance:
Hydrated copper sulphate to sulphur dioxide
Give a suitable example with an equation to show the representation of a chemical reaction.
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Zinc carbonate.
The water we drink is a combination of hydrogen and oxygen.
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Can you change rust back into iron by some simple method?
Magnesium + oxygen → magnesium oxide.
2Mg + O2 → 2Mg O
Write five changes in the characteristics of a substance that can take place during a chemical change.
We are advised to not to play with fireworks. Give reason.
Write a note on the following:
Curdling of milk
Why is spoiling food a chemical change?
