A chemical reaction in which two or more substances undergo a chemical union to form a more complex substance is a _______ react
2 answers:
Answer : The correct option is, (D) Combination
Explanation :
- Double replacement reaction : A chemical reaction in which a positive cation and a negative anion of the two reactants exchange places to give two new products or compounds.
The general representation of this reaction is,
(A and C are the cations, B and D are the anions)
- Substitution reaction : A chemical reaction in which a more reactive element displaces the least reactive element.
The general representation of this reaction is,
- Decomposition reaction : A chemical reaction in which a bigger compound breaks into two or more smaller compounds or elements.
The general representation of this reaction is,
- Combination reaction : A chemical reaction in which two or more substances react to form a more complex substance.
The general representation of this reaction is,
Hence, the correct option is, (D) Combination
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Answer : The correct option is, (C) 2, 4 and 5.
Explanation :
Combustion reaction : It is a type of reaction in which a hydrocarbon react with an oxygen molecule to give carbon dioxide, water as a product.
For example : Methane react with oxygen to give carbon dioxide and water.
In the given list of chemical substances, are in oxide form. They can not be both reactant and product of a single combustion reaction.
In the given list, is the only hydrocarbon which shows a combustion reaction. That means
react with
to give
and
as a product.
The balanced combustion reaction of is,
Therefore, the correct answer is, (C) 2, 4, and 5.