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Ca(OH)2 + H2SO4 → CaSO4 + 2H2O is which type of reaction?

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Ca(OH)2 + H2SO4 → CaSO4 + 2H2O is which type of reaction?

(a) Replacement

(b) Decomposition

(c) Addition

(d) Double decomposition

I have been asked this question during a job interview.

Origin of the question is Unit Process topic in section Unit Operations and Unit Process of Chemical Technology

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The correct option is (d) Double decomposition

The explanation is: Any reaction of the form  AB + CD → AD + CB  is said to be double decomposition.

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