$2$ Use the following information to answer the next question.

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A solution of nickel$($II$)$ sulfite is combined with a solution of sodium hydroxide.

A piece of solid silver is placed in an acidified solution of potassium sulfate.

A solution of nickel$($II$)$ nitrate is combined with an iron$($II$)$ chloride solution.

A solution of sodium hypochlorite is mixed with a chromium$($II$)$ iodide solution.

Chlorine gas is bubbled through a tin$($II$)$ nitrate solution.

A piece of solid cadmium is placed in a beaker of lead$($II$)$ nitrate solution.

A piece of gold placed is placed in a beaker containing a sulfuric acid solution.

A solution of potassium nitrate has hydrogen gas bubbled through it$.$

The above combinations that would produce a spontaneous reaction are