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प्रश्न
Define chemical reaction.
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उत्तर
Any chemical change in matter that involves its transformation into one or more new substances is called a chemical reaction.
संबंधित प्रश्न
Complete and balance the following chemical equations:
`"H"_2"S"` + `"CI"_2` `→`
Classify the following reaction as combination, decomposition, displacement, precipitation and neutralization. Also balance the equation.
\[\ce{NH3_{(g)} + HCl_{(g)} -> NH4Cl_{(s)}}\]
What are chemical reactions?
Define electrolysis.
Name the type of chemical reaction shown by the following equation:
2Mg + O2 → 2MgO
Name the type of chemical reaction shown by the following equation:
NaOH + HCl → NaCl + H2O
| 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 |
Give an example of the following chemical change.
A reaction where colour change is noticed
State the type of reactions for the following represent and balance the ones that are not balanced.
Cl2 + 2KBr → 2KCl + Br2
Name the gases which turn moist red litmus blue.
Explain the term ‘chemical reaction’ with special reference to – ‘reactants’ and ‘products’.
Name the following:
The products obtained during ‘photosynthesis’ – which is a chemical change.
Give balanced equation for the following conversion affected by heat alone on the substance:
Copper carbonate to copper oxide
Give balanced equation for the following conversion affected by heat alone on the substance:
Copper nitrate to nitrogen dioxide
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 |
A chemical reaction is often accompanied by external indications or characteristics.
What kind of a change is associated with decaying of a plants?
Discuss how acid rain occurs due to emission of smoke from vehicles and industries?
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Can you change rust back into iron by some simple method?
Photosynthesis is a chemical charge. Justify your answer.
