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प्रश्न
State whether the following statements are true or false:
Anaerobic bacteria digest animal waste and produce biogas.
विकल्प
True
False
उत्तर
True
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संबंधित प्रश्न
Classify the changes involved in the following process as physical or chemical changes:
Photosynthesis
Write short answer.
Name two reversible changes.
State whether the following is physical or chemical changes.
shaping a piece of glass —
Tick (√) the correct alternative from the choice given for the following statement
A pop sound is heard when a lighted match stick is brought near the mouth of a jar. This indicates the release of gas.
Which of the following are physical changes and which are chemical changes ?
Name the following:
The type of change physical or chemical involved – ‘when a substance undergoes a change in state, colour or size’.
Select the chemical changes from the following list of changes
Change of seasons
State which of the following 1 to 5 pertain to – A: Physical Change B: Chemical change :
- Sublimation.
- Fermentation.
- Liquefaction or condensation.
- Magnetization.
- Respiration.
Name the following.
The salt obtained when a chemical change takes place on the addition of iron to dilute sulphuric acid.
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 rust is different from iron?
