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प्रश्न
Iron benches kept in lawns and gardens get____________. It is a _________ change because a new _________ is formed.
उत्तर
Iron benches kept in lawns and gardens get rusted. It is a chemical change because a new substance is formed.
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संबंधित प्रश्न
How do the following help in bringing about a chemical change?
heat.
Complete and balance the following chemical equations:
`"H"_2"S"` + `"CI"_2` `→`
A solution of a substance ‘X’ is used for white washing Name the substance ‘X’ and write its formula.
Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.
(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)
The white particles of baking soda disappear when put in lemon juice. This means that it is a ______ change.
Multiple choice:
Thermal decomposition of sodium carbonate will produce
State the following reaction represent oxidation or reduction.
\[\ce{Cl- ->Cl}\]
Water boiling into water vapour is an example of chemical change.
Classify each of the following, as a physical or a chemical change. Give reasons.
(a) Drying of a shirt in the sun.
(b) Rising of hot air over a radiator.
(c) Burning of kerosene in a lantern.
(d) Change the colour of black tea by adding lemon juice to it.
(e) Churning of milk cream to get butter.
Chemical changes are important in our day-to-day life. Give examples.
Write a note on the following:
Fermentation
