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Which of the following oxides react exothermically with water forming hydroxides ?

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Which of the following oxides react exothermically with water forming hydroxides ?
A. CaO
B. SrO
C. BaO
D. All of these
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Correct Answer - D
All these oxides except BeO (covalent) are basic in nature and react with water to form hydroxides. CaO, SrO, and BaO react exothermicaly with water forming hydroxides:
`MO+H_(2)OtoM(OH)_(2)`
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