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प्रश्न
Differentiate between the following:
Decomposition reaction and a double decomposition reaction.
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उत्तर
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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संबंधित प्रश्न
Explain, giving one example for each of the following chemical changes:
Displacement
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 |
State which of the substance given below evolve oxygen gas on thermal decomposition.
Zinc nitrate
Define the following type of chemical change or reaction with a suitable example.
Double decomposition reaction
Give a balanced equation for a direct combination reaction involving:
Two elements – one of which is a neutral gas and the other a yellow non-metal
Give a balanced equation for the following reaction of synthesis involving the formation of:
An acid – from sulphur dioxide gas
Give a balanced equation for thermal decomposition of mercury [II] oxide
State how displacement reaction represented.
Convert an insoluble base
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.
