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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
FILL IN THE BLANK
In a double decomposition precipitation reaction both the reactants must be ............ soluble.
Fill in the blank
A change in which the substance can be brought back to its original state is called a _______ change.
Balancing a chemical equation is based on
Explain the following reaction with one suitable example of Combination reactions .
Explain the following reaction with one suitable example of Displacement reaction.
Explain the following reaction with one suitable example of Double decomposition reaction.
| Reactants | Products | Type of chemical reaction |
| BaCl2(aq) + ZnSO4(aq) | H2CO3(aq) | Displacement |
| 2AgCl(s) | FeSO4(aq) + Cu(s) | Combination |
| CuSO4(aq) + Fe(s) | BaSO4↓ + ZnCl2(aq) | Decomposition |
| H2O(l) + CO2(g) | 2Ag(s) + Cl2(g) | Double displacement |
Write the chemical reaction where the following changes are observed.
Physical state is changed
What do you understand by 'chemical reaction'?
State the original colour of the following substance and colour of residue obtained after heating.
Ammonium dichromate
Distinguish by heating the following in dry test tubs.
Copper Sulphate and copper carbonate
Name the following:
The products obtained during ‘photosynthesis’ – which is a chemical change.
On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.
A coloured substance which leaves on strong heating a black residue and evolves two colourless gases one of which is acidic and the other neutral.
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 |
Circle the odd one out. Give reason for your choice
______ is not a chemical change.
Discuss how acid rain occurs due to emission of smoke from vehicles and industries?
Water boiling into water vapour is an example of chemical change.
State whether the following statement is true or false:
When a candle burns, both physical and chemical changes take place.
Iron benches kept in lawns and gardens get____________. It is a _________ change because a new _________ is formed.
