Which type of reaction occurs when 50 ml quantities of ba(oh)2(aq) and h2so4(aq) are combined?

The   type  of  reaction  that  occur  when  50  ml  quantities  of  Ba(OH)2  and  H2SO4  are  combined  is    neutralization  reaction

 Neutralization  is  type of  chemical reaction   occurs  when srong  acid  and  strong base  react  to  form  salt  and  water.  Ba(OH)2  is the  base  in this  case  while  H2SO4  is  the  acid H2SO4  produces  H^+  while  Ba(OH)2  produces  OH^-  to  generate   water.

Explanation:

Molecules of a solid substance are closer to each other due to the existence of strong forces of attraction between them.

So, these molecules are not able to move randomly but they are able to vibrate at their initial position. Hence, solid substances will have a definite shape and volume.

Solids are not compressible in nature.

And, molecules of a liquid tend to move easily from one place to another as compared to solids because they are held by slightly weak forces.

Therefore, liquid molecules are able to slide past each other and hence, liquids do not have a fixed shape but they do have fixed volume.

Liquids take the shape of a container in which they are kept.

Therefore, liquids are more compressible as compared to solids.