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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.
Do you think formation of rust from iron is a chemical change?
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उत्तर
Yes, rusting is a chemical change since a new substance is formed.
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संबंधित प्रश्न
How do the following help in bringing about a chemical change?
pressure.
Fill in the blank
A new substance is formed in a _______ change.
Fill in the blank:
In some chemical reactions an insoluble ________ is formed when two solutions are mixed.
Give reason for the following:
Silver nitrate solution is kept in coloured bottles.
Multiple choice:
A reaction of a type: AB + CD → AD + CD, involves
Give two examples where a chemical reaction is accompanied by a change in colour of the reactants and products on completion of the reaction.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Ammonium dichromate.
Which of the following is not an “element + element → compound” type reaction?
______ occurs in the absence of air and in the presence of micro-organisms such as yeast.
The chemical formula of rust is ______.
