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प्रश्न
Tick (√) the correct alternative from the choice given for the following statement
Which one of the following is volatile in nature ?
विकल्प
common salt
petrol
water
milk
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उत्तर
petrol
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संबंधित प्रश्न
Which of the following are chemical changes?
- Growth of a plant
- Rusting of iron
- Mixing of iron fillings and sand
- Cooking of food
- Digestion of food
- Freezing of water
- Burning of candle
What role does energy play in initiating a chemical change ?
State whether the following is physical or chemical changes.
burning of sugar —
State whether the following is physical or chemical changes.
growing of a piglet into a pig —
Solve this crossword by using the clues that follow-
Across
1. Energy in the form of sunlight is absorbed by the green plants in this process.
4. The reddish-brown substance formed over iron in the presence of oxygen and moisture.
5. This change is permanent and irreversible.
6. The process in which a solid directly changes into gaseous state.
Down
1 . It is the change that takes place in case of swinging pendulum of a clock. –
2. Occurrence of this is a non-periodic change as well as a natural change.
3. It is a physical change.
Change is the law of nature and occurs in our everyday life, at all times and in all places. Differentiate between the following change with a suitable example.
Desirable and undesirable change.
Fill in the blanks with the appropriate words of the statement given below:
Heating a piece of iron is considered a __________ change while heating a piece of coal [carbon] is considered a ___________ change.
A change in which matter undergoes a change but the total mass of the substance is unaltered is a ______ change.
When a woolen yarn is knitted to get a sweater, the change can be classified as ____________.
Water is known as a universal solvent. Why?
