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प्रश्न
Tick (√) the correct alternative from the choice given for the following statement.
The compound rust is a hydrated oxide of
पर्याय
copper
aluminium
iron
gold
उत्तर
iron
APPEARS IN
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
Write short answer.
What are man-made changes ?
State whether the following is physical or chemical changes.
photosynthesis —
Name two reversible changes.
Classify the following as physical or chemical change :
Growth of a plant
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.
Natural and man-made change.
Differentiate between a physical change and a chemical change with reference to – Nature of change is temporary and reversible or permanent and irreversible.
Give four reasons why the burning of a magnesium ribbon in the air is considered a chemical change.
Gas exists in three states as solid, liquid, and gas.
State whether the following statements are true or false:
Anaerobic bacteria digest animal waste and produce biogas.
