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प्रश्न
Circle the odd one out. Give reason for your choice
पर्याय
Growth of a child
Blinking of eye
Rusting
Germination of a seed
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उत्तर
Rusting
Reason: Rusting is undesirable change. Others three are desirable changes.
APPEARS IN
संबंधित प्रश्न
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.
Complete and balance the following chemical equations:
N2 + O2 →
Complete and balance the following chemical equations:
`"H"_2"S"` + `"CI"_2` `→`
What are oxides ?
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
FILL IN THE BLANK
A .............. change is a temporary change.
TRUE \ FALSE
Copper can displace iron from iron sulphate.
Fill in the blank
A change in which the substance can be brought back to its original state is called a _______ change.
Give an example of a reaction where the following are involved:
Close contact
Give an example of a reaction where the following are involved:
Solution
Name: A brown gas
State the original colour of the following substance and colour of residue obtained after heating.
Copper carbonate
Give a chemical test to distinguish between the following gases.
NH3 and SO2
State whether the following reaction is oxidation or reduction.
\[\ce{Na->Na+}\]
Give a balanced equation for the conversion of an ammonium salt to a basic gas.
Higher order Thinking question
Peeled and unpeeled banana does not look the same. Does that mean peeling banana is a chemical change?
What is the role of a catalyst in a chemical reaction?
A reaction between an acid and a base is called ______.
Rusting of iron is ______.
Write a note on the catalyst.
