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प्रश्न
Define the following type of chemical change or reaction with a suitable example.
Direct combination reaction or synthesis
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उत्तर
Direct Combination Reaction or Synthesis:
“Those reactions in which two or more substances [element or elements and compound or compounds] combine and form a new substance”.
\[\ce{H2 + O2->H2O}\]
Hydrogen combines with oxygen to produce new substance water.
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संबंधित प्रश्न
Explain the types of reaction with reference to oxygen and hydrogen. Illustratre with examples.
Explain, giving one example of the following chemical changes:
Double decomposition
(a) What is synthesis?
(b) What kind of chemical reaction is synthesis? Support your answer by an example.
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 |
Decomposition reactions can occur by electricity
Give balanced reactions.
State which of the substance given below evolve oxygen gas on thermal decomposition.
Anhydrous copper sulphate
Give a balanced equation for the following reaction of synthesis involving the formation of:
An alkali – from a basic oxide – sodium oxide
Give a balanced equation for thermal decomposition of lead carbonate
Name a metallic oxide which on thermal decomposition is reduced to metal.
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.
