For which of the two pairs, the angle of contact is same ?

Angle of contact for that pair of solid and liquid is defined as the angle inside the liquid between the tangent to the solid surface and the tangent to liquid surface at the point of contact. 

The angle of contact for liquids that wet a solid is acute; it is zero for clean, pure water and glass, as well as for alcohol and glass. 

However, it is 138° for glass and mercury, 90° for silver and water, and 160° for water and chromium.

Hence the correct answer is pure water and glass; glass and alcohol.