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प्रश्न
Define the following type of chemical change or reaction with a suitable example.
Double decomposition reaction
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उत्तर
Double decomposition reaction:
“Those reactions in which two compounds react by an exchange of ions to form two new compounds are called double displacement reactions”.
\[\ce{\underset{\text{silver nitrate}}{AgNO3} + \underset{\text{sodium chloride}}{NaCl}->\underset{\text{white ppt. (silver chloride)}}{AgCl} + \underset{\text{sodium nitrate}}{NaNO3}}\]
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संबंधित प्रश्न
(a) Define the neutralization reaction with an example.
(b) Give a balanced equation for this reaction.
(c) Give three applications of neutralization reactions.
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CaCO3→ CaO+ CO2
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A coloured substance which decomposes violently leaving a coloured residue and evolving two neutral gases one of which is unreactive or inert in nature.
State which of the substance given below evolve oxygen gas on thermal decomposition.
Anhydrous copper sulphate
Give a balanced equation for a direct combination reaction involving:
Two compounds – resulting in the formation of a weak acid
Give a balanced equation for thermal decomposition of lead nitrate
Give a balanced equation for thermal decomposition of mercury [II] oxide
Give an example of a photochemical decomposition reaction.
Select the correct answer from the options given below:
State the gaseous product formed, when
A metallic nitrate undergoes thermal decomposition giving a coloured gas.
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 |
