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From the following choose the statements...

From the following choose the statements suitable for carbon dioxide.
i) Formed by the incomplete combustion of substances.
ii) It's aqueous solution is acidic.
iii) Obtained by the reaction between carbonates and acids.
iv) It is used as a reducing agent in metallurgical processes.

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i) it.s aqueous solution is acidic
ii ) Obtained by the reactio between carbonates and acid
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