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प्रश्न
Name the following.
The product of the chemical change in keeping a polished iron nail exposed to the atmosphere.
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उत्तर
Iron III oxide [Fe2O3x H20]
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संबंधित प्रश्न
Choose the most appropriate answer.
Rising and setting of the sun at a given place is a
State whether the following is physical or chemical changes.
respiration in living beings —
Tick the most appropriate answer.
Photosynthesis requires
Fill in the blank.
The reaction in which energy is evolved is called
Fill in the blank with the correct word of the statement given below:
Sublimation involves a __________ change.
When ice melts to form water, change occurs in its
Physical Change: Boiling::Chemical Change: ______.
Water is known as a universal solvent. Why?
Match the items of Column I with the items of Column II.
| Column I | Column II | ||
| (a) | Large crystals | (i) | Turns lime water into milky |
| (b) | Depositing a layer of zinc on iron | (ii) | Physical change |
| (c) | Souring of milk | (iii) | Rust |
| (d) | Carbon dioxide | (iv) | Sugar candy (Mishri) |
| (e) | Iron oxide | (v) | Chemical change |
| (f) | Dissolving common salt in water | (vi) | Galvanisation |
Grinding of wheat grain changes its size. It is a ____________ change.
