What is emitted by volcanoes that mix with water vapor to produce acid
rain?

Carbon dioxide, sulfur dioxide, hydrogen sulfide and hydrogen halides are  emitted by volcanoes that mix with water vapor to produce acid rain.

Explanation:

When a volcano erupts, it releases the magma and various other harmful gases rocketing into the atmosphere and the surface. The gases that are emitted during the eruption are the significant amount of Carbon dioxide, sulfur dioxide, hydrogen sulfide and hydrogen halides which are very toxic and harmful.

These gases are also easily soluble with the water vapor in the atmosphere or within the volcanic plumes. This contaminated water vapor can cause acid rain which in turn can significantly damage and contaminate crops, lands, soil, houses, statues, drinking water supply, etc.