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Question
Differentiate between the following:
Decomposition reaction and a double decomposition reaction.
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Solution
Decomposition reaction and double decomposition reaction:
- Decomposition reaction: A compound decomposes into two or more new substances.
\[\ce{\underset{\text{orange}}{[NH4]2Cr2O7}->\underset{\text{green}}{Cr2O3} + 4H2O + N2}\] - Double decomposition: “Two substances exchange their ions and two new substances are produced one of which is insoluble i.e. ppt.”
\[\ce{AB + CD->AD + CB}\]
\[\ce{CaCl2 + Na2CO3->\underset{\text{ppt.}}{CaCO3} + 2NaCl}\]
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RELATED QUESTIONS
State the type of reactions for the following represent and balance the ones that are not balanced.
PbO2 + SO2→ PbSO4
Match the following:
|
a. Zn(s) + H2SO4(aq) → ZnSO4(aq) + H2(g) |
i. Photochemical decomposition |
|
b. \[\ce{2AgCI(s) ->[Sunlight] 2Ag(s) + CI2(g)}\] |
ii. Thermal decomposition |
|
c. \[\ce{2KCI ->[Electricity] 2K + CI2}\] |
iii. Displacement reaction |
|
d. \[\ce{2HgO(s) ->[\Delta] 2Hg(s) + O(g)}\] |
iv. Electrolytic decomposition |
Select the correct salt from list II which on thermal decomposition exhibits the change in colour from list I.
| List I | List II |
| 1. Light green to black | A: Copper carbonate |
| 2. White to yellow [heated state] | B: Hydrated Copper sulphate |
| 3. Blue to black | C: Copper nitrate |
| 4. Orange to green | D: Ammonium dichromate |
| 5. Blue to white | E: Zinc nitrate |
Define the following type of chemical change or reaction with a suitable example.
Double decomposition reaction
Give a balanced equation for the following reaction of synthesis involving the formation of:
An alkali – from a basic oxide – sodium oxide
Define a thermal dissociation reaction with a suitable example.
Define the term – double decomposition – neutralization reaction.
Complete the statement by filling in the blank with the correct word:
Direct combination reaction of sulphur dioxide with water gives ________.
Differentiate between the following:
Thermal decomposition & thermal dissociation.
Match the chemical reactions in List I with the appropriate answer in List II.
| List I | List II |
| 1. \[\ce{AB⇌[heat]A + B}\] | A: Double decomposition |
| 2. \[\ce{AB->A + B}\] | B: Thermal dissociation |
|
3. \[\ce{X+Y- + AB+B- ->X+B- + A+Y-}\] |
C: Endothermic reaction |
| 4. \[\ce{X + YZ->XZ + Y}\] | D: Displacement reaction |
| 5. \[\ce{X + Y->[heat]XY - \Delta}\] | E: Decomposition reaction |
