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alukav5142 [94]
3 years ago
10

Which of the following is a double replacement reaction? Ca(OH)2 + H2SO4 → CaSO4 + 2H2O CH4 + 2O2 → CO2 + 2H2O 8Fe + S8 → 8FeS Z

n + H2SO4 → ZnSO4 + H2
Chemistry
2 answers:
abruzzese [7]3 years ago
8 0

That would be the first option Ca(OH)2 + H2SO4  → CaSO4 + 2H2O.

The Ca replaces the H2 in H2SO4,  and the  H2 replaces the Ca is Ca(OH)2.

goblinko [34]3 years ago
8 0

Answer: Option (a) is the correct answer.

Explanation:

A chemical reaction in which there occurs exchange of two ions between two different compounds is known as a double replacement reaction.

For example, Ca(OH)_{2} + H_{2}SO_{4} \rightarrow CaSO_{4} + 2H_{2}O

Here, OH^{-} ions of CaOH_{2} is replaced by SO^{21}_{4} ions of sulfuric acid and  SO_{4} of sulfuric acid is replaced by OH^{-} ions of CaOH_{2}.

When two atoms combine together to form a compound then it is known as synthesis reaction.

When a compound reacts with oxygen to give carbondioxide and water then it is known as combustion reaction.

When a metal is treated with an acid to yield hydrogen gas then it is known as single replacement reaction.

Therefore, we can conclude that Ca(OH)_{2} + H_{2}SO_{4} \rightarrow CaSO_{4} + 2H_{2}O  is a double replacement reaction.

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