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प्रश्न
Fill in the blank:
During a chemical reaction transfer of ________ takes place.
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उत्तर
During a chemical reaction transfer of energy takes place.
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संबंधित प्रश्न
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Which one of the following alters the rate of the chemical reaction without itself undergoing any change?
- temperature and Pressure
- concentration of reactants
- presence of catalyst
- none of these
TRUE \ FALSE
Weak electrolytes dissociate partially in their aqueous or fused state.
Fill in the blank
A new substance is formed in a _______ change.
Write true or false :
No new substance is formed during a chemical reaction.
Explain by writing a word equation.
Bubbles are seen on adding lemon juice to baking soda.
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Water
What do you observe? When
Water is added to the quick lime.
Name the following:
The products obtained during ‘photosynthesis’ – which is a chemical change.
Match the chemical reactions in List I with the appropriate answer in List II.
| List I | List II | ||
| 1. | \[\ce{XY⇌[heat]X + Y}\] | A: | Displacement reaction |
| 2. | \[\ce{XY->X + Y}\] | B: | Double decomposition |
| 3. | \[\ce{X+Y- + A+B^-->X+B- + A+Y-}\] | C: | Endothermic reaction |
| 4. | \[\ce{X + YZ->XZ + Y}\] | D: | Thermal dissociation |
| 5. | \[\ce{X + Y->[heat]XY -\Delta}\] | E: | Decomposition reaction |
Explain the term chemical reaction with special reference to reactants and products.
Give a balanced equation for the conversion of a soluble lead salt to an insoluble lead salt – formed as a white precipitate.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Calcium hydroxide.
Higher order Thinking question
Peeled and unpeeled banana does not look the same. Does that mean peeling banana is a chemical change?
Discuss how acid rain occurs due to emission of smoke from vehicles and industries?
A reaction between an acid and a base is called ______.
When lithium metal is placed in hydrochloric acid, _______ gas is evolved.
Analogy:
H2O: Water:: NaCl: ______.
Which of the following is a chemical change?
Give an example of a chemical reaction for the following situation:
A change in colour is observed
When milk is mixed with coffee decoction, the colour of milk and decoction changes due to ______.
