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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 ?
पर्याय
common salt
petrol
water
milk
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उत्तर
petrol
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संबंधित प्रश्न
Write short answer.
Name two reversible changes.
Tick (√) the correct alternative from the choice given for the following statement.
A substance which can not sublime is
Fill in the blank
Changes that occur in nature are called ______
Two chemical substances X and Y combine together to form a product P which contains both X and Y X + Y P
X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following statements concerning X, Y and P are correct ?
- P is a compound
- X and Y are compounds
- X and Y are elements
- P has a fixed composition
Which of the following are physical changes and which are chemical changes ?
Rusting of iron
Fill in the blank with the correct word of the statement given below:
Sublimation involves a __________ change.
Fill in the blank with the correct word of the statement given below:
Sublimation of iodine is an example of _________ change.
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 |
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?
Cutting a log of wood into pieces is a chemical change.
