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Which of the following are combination ...

Which of the following are combination reactions?
`2KClO_3to2KCl+3O_2`
`MgO+H_2OtoMg(OH)_2`
`4Al+3O_2to2Al_2O_3`
`Zn+FeSO_4toZnSO_4+Fe`

A

a and d

B

c and d

C

b and d

D

b and c

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The correct Answer is:
D
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  14. Explain the following in terms of gain or loss of oxygen with two exam...

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  19. Explain the following terms with one example each. rancidity.

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