Advertisements
Advertisements
प्रश्न
Melting of wax is a change where a solid changes to liquid state. Give one more such change which you observe in your surroundings
Advertisements
उत्तर
Melting of ice, melting of butter
APPEARS IN
संबंधित प्रश्न
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Condensation of steam is not a chemical change.
Complete and balance the following chemical equations
NaCI + `AgNO_3` `→`
Explain by writing a word equation.
Bubbles are seen on adding lemon juice to baking soda.
Define a photochemical reaction.
Give reason for the following:
Molybdenum is used in the manufacture of ammonia.
Give a word equation for the following reaction.
Two gases which combine to give a solid.
Explain the following statement: Digestion is a chemical change.
Two chemical species X and Y combine together to form a product P which contains both X and Y
\[\ce{X + Y -> P}\]
X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following concerning the species X, Y and P are correct?
(i) P is a compound
(ii) X and Y are compounds
(iii) X and Y are elements
(iv) P has a fixed composition
Give an example of a chemical reaction for the following situation:
A change in colour is observed
Match the following:
| Column I | Column II | ||
| 1. | Burning of coal | a. | Rusting |
| 2. | Painting of a surface | b. | Evaporation |
| 3. | Dipping iron in the water | c. | Chemical change |
| 4. | Salt from seawater | d. | Prevention of rusting |
