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प्रश्न
What is the role of a catalyst in a chemical reaction?
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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.
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संबंधित प्रश्न
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Iron and rust are the same substances.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer
Which of the following is a reducing agent?
- oxygen
- chlorine
- hydrogen
- none of these
Write a short note on the information derived from a balanced chemical equation.
Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.
(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)
Chlorine (Cl2) molecule is formed by ______ of electrons between two chlorine atoms.
When electric current is passed through acidulated water ______ of water takes place.
What do you understand by precipitation reaction? Explain with examples.
Give balanced equation for the following conversion affected by heat alone on the substance:
Copper carbonate to copper oxide
Complete the table given below.
| Heat on Zinc nitrate | Colour of residue |
The percentage composition of Nitrogen in Ureas is ______.
Vanaspati is obtained from vegetable oils by the addition of ______ to the oils.
