Question

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

Answer 1

for those in a hurry, its C

Step-by-step explanation:

on edge. Metal and carbonates

Answer 2

Answer: metal and carbonate

Explanation:

According to Arrhenius concept, a base is defined as a substance which donates hydroxide ions
`(OH^-)` when dissolved in water and an acid is defined as a substance which donates hydrogen ions
`(H^+)` in water.

An acid is represented as :

`HX\rightarrow H^++X^-`

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

`M+xHCl(aq)\rightarrow MCl_x(aq)+xH_2(g)`

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

`MCO_3(aq)+xHCl(aq)\rightarrow MCl_x(aq)+xH_2O(l)+CO_2(g)`