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प्रश्न
Write your observation and a balanced equation in the case of the following substances being heated.
Zinc carbonate.
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उत्तर
Zinc carbonate on heating decomposes to zinc oxide and carbon dioxide gas.
\[\ce{ZnCO3(s) -> ZnO(s) + CO2(g) ↑}\]
This is similar to the decomposition of limestone (CaCO3CaCO3) to quick lime (CaOCaO) and carbon dioxide.
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संबंधित प्रश्न
How do the following help in bringing about a chemical change?
light.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Compounds, which in their molten state allow an electric current to pass through them are called
- electrolytes
- non-electrolytes
- non-conductors
- none of these
Explain the type of reactions on the basis of the direction of reaction.
Name the type of chemical reaction shown by the following equation:
NaOH + HCl → NaCl + H2O
Define a photochemical reaction.
When hydrogen burns in oxygen, water is formed; when electricity is passed through water, hydrogen and oxygen are given out. Name the type of chemical change involved in the two cases.
What do you observe when HCI is passed through a silver nitrate solution.
Give reason for the following:
Electrolytic decomposition of water is a reaction involving change of state.
Classify the following processes into physical or chemical changes:
- Beating of aluminium metal to make aluminium foil.
- Digestion of food.
- Cutting of a log of wood into pieces.
- Burning of crackers.
What are the chemical reactions that occur in everyday life?
