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प्रश्न
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?
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उत्तर
No, rusting is a chemical change and cannot be reversed.
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संबंधित प्रश्न
The chemical name of baking soda is ______.
FILL IN THE BLANK
In a double decomposition precipitation reaction both the reactants must be ............ soluble.
What are chemical reactions?
Explain the following reaction with one suitable example of Double decomposition reaction.
State the original colour of the following substance and colour of residue obtained after heating.
Zinc carbonate
Explain with the help of balanced equations, how precipitation reactions are used for identifying the positive radicals in three different salts, each having a different cation [positive ion].
What happens when cane sugar is strongly heated? Mention any two changes in it.
A reaction between an acid and a base is called ______.
Give an example of a chemical reaction for the following situation:
A change in colour is observed
Both CO2 and H2 gases are ______.
