Advertisements
Advertisements
प्रश्न
What is the role of a catalyst in a chemical reaction?
Advertisements
उत्तर
Substances used to alter the speed of a chemical reaction, are called catalysts. For example, metallic iron is used as a catalyst in the manufacture of ammonia by Haber’s process.
APPEARS IN
संबंधित प्रश्न
How do the following help in bringing about a chemical change?
heat.
Complete and balance the following chemical equations:
`"H"_2"S"` + `"CI"_2` `→`
FILL IN THE BLANK
A .............. change is a temporary change.
FILL IN THE BLANK
Distillation is a method of obtaining pure ............. from a solution.
State what you would observe when the following substance is heated in a glass test tube red lead.
Explain by writing a word equation.
Limestone powder disappears on adding to dilute hydrochloric acids.
Name the following:
The products obtained during ‘photosynthesis’ – which is a chemical change.
State whether the following reaction is oxidation or reduction.
\[\ce{Na->Na+}\]
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 |
Collect information about the types of fuels used for cooking in your area. Discuss with your teachers/parents/others which fuels are less polluting and why.
