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प्रश्न
Fill in the blank
A catalyst either ................or ............... the rate of a chemical change but itself remains ............... at the end of the reaction.
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उत्तर
A catalyst either increases or decreases the rate of a chemical change but itself remains unchanged at the end of the reaction.
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संबंधित प्रश्न
Fill in the blanK
A .............is a substance which changes the rate of a chemical reaction without undergoing a chemical change.
Write the missing reactants and products and balance the equations.
NaOH + ............... `→` NaCI + ...................
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer
Which of the following is a reducing agent?
- oxygen
- chlorine
- hydrogen
- none of these
TRUE \ FALSE
Copper can displace iron from iron sulphate.
Fill in the blank:
During a chemical reaction transfer of ________ takes place.
Give reason for the following:
Molybdenum is used in the manufacture of ammonia.
Multiple choice:
Which of the following is not a characteristic of a chemical change?
What do you observe? When
Sodium chloride solution is added to silver nitrate solution.
Complete and balance the following reaction:
\[\ce{NH3 + O2 ->[\Delta]}\]
Name: Two carbonates do not produce carbon dioxide on heating.
Complete the following table and write your observations.
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Hydrogen sulphide |
Ammonia |
Sulphur dioxide |
Hydrogen chloride |
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Shake the gas with red litmus solution |
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Shake the gas with blue litmus solution |
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Apply a burning splint to a gas |
Name: Two nitrates that do not produce nitrogen dioxide on heating.
What do you observe when CO2 is passed through lime water first and then a little in excess.
Give a word equation for the following reaction.
A compound which on heating shows – colour change from brown to yellow.
Give a suitable example with an equation to show the representation of a chemical reaction.
Higher order Thinking question
Peeled and unpeeled banana does not look the same. Does that mean peeling banana is a chemical change?
Assertion: The formation of iron oxide from iron is a chemical change.
Reason: For the rust to form from iron, it must be exposed to air and water.
Classify the following as physical or chemical properties
Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas.
Which of the following is/are true when milk changes into curd?
- Its state is changed from liquid to semi solid.
- It changes colour.
- It changes taste.
- The change cannot be reversed.
Choose the correct option from below:
