B) decomposition
C) single replacement
D) double replacement
The reaction in which two or more substances combine to form one substance is called a synthesis reaction, Option A is the correct answer.
The reaction in which two or more molecules combine to form one or more different molecule is called a synthesis reaction.
These are also called as Combination Reaction.
Example Synthesis reaction of Ammonia from Hydrogen and Nitrogen , known as Haber's Process.
3H₂ + N₂-----> 2NH₃
This reaction takes place at high temperature and pressure.
Therefore , The reaction in which two or more substances combine to form one substance is called a synthesis reaction, Option A is the correct answer.
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When solid converts to gas then heat is required to break the intermolecular forces of attraction between the particles. Melting point will increases as the number of carbon-carbon double bonds increases.
Phase transition is a process in which transition takes place from one state to another of a medium on changing temperature or pressure. Phase transition is a physical process as there is no breaking of old bond and forming of new bonds takes place.
As bond strength increases, melting point and boiling point also increases. Triple bond is more stronger than double bond and double bond is more stronger than single bond. Melting point will increase as there will be strong bonds to break.
Therefore, melting point will increases as the number of carbon-carbon double bonds increases.
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CuSO4 + 2NaOH mc009-2.jpg Cu(OH)2 + Na2SO4
2NaOH + H2CO3 mc009-3.jpg Na2CO3 + 2NaOH
Pb(NO3)2 + Na2SO4 mc009-4.jpg 2NaNO3 + PbSO4
Answer:
The correct option is: Fe₂O₃ + 3CO → 2Fe + 3CO₂
Explanation:
An oxidation-reduction reaction, also known as the redox reaction, is a chemical reaction in which there is simultaneous transfer of electrons from one species to another.
The species that gains electrons gets reduced. Whereas, species that loses electrons gets oxidized.
Among the given options, only reaction 1 is a redox reaction:
Fe₂O₃ + 3CO → 2Fe + 3CO₂
Reason- In this reaction, iron (Fe) gains electrons and gets reduced from +3 oxidation state in Fe₂O₃ to 0 oxidation state in Fe. Whereas, carbon (C) loses electrons and gets oxidized from +2 oxidation state in CO to +4 oxidation state in CO₂.
Since both the oxidation and reduction reactions are occurring simultaneously.
Therefore, it is an redox reaction.