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  • Which of the following statements is not correct? (a) All metal carbonates react with acid to give a salt, water and carbon dioxide (b) All metal oxides react with water to give salt and acid

Which of the following statements is not correct?

(a) All metal carbonates react with acid to give salt, water and carbon dioxide

(b) All metal oxides react with water to give salt and acid

(c) Some metals react with acids to give salt and hydrogen

(d) Some non-metal oxides react with water to form an acid

Answers (1)

Answer: (b)

Most metal oxides are insoluble in water, but some of them (e.g.Na_{2}O, CaO) dissolve in water to form alkalis, not salt and acid.

\text {Metal oxide + acid }\rightarrow \text {Salt+water}

MgCO_{3} + H_{2}SO_{4} \rightarrow MgSO_{4} + H_{2}O + CO_{2}

\text {Metal oxide + water}\rightarrow \text {Base}

MgO+H_{2}O\rightarrow Mg\left ( OH \right )_{2}

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