Which pair of substances would most likely result in the production of a gas when reacting with an acid?

litmus and methyl orange

base and salt

metal and carbonate

carbon dioxide and water

metal and carbonate

Explanation:

According to Arrhenius concept, a base is defined as a substance which donates hydroxide ions when dissolved in water and an acid is defined as a substance which donates hydrogen ions in water.

An acid is represented as :

1. When metal is treated with an acid such as , if the metal is more reactive than hydrogen displaces hydrogen from its salt solution and thus produce zinc chloride and hydrogen gas.

2. When carbonates are treated with acid, double displacement takes place ad carbon dioxide is released as a gas.

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