If a liquid wets a surface,is its angle of contact acute or obtuse?

How does the angle of contact depend on temperature?

Fill in the blanks:
$(i)$ If a liquid sticks to the glass,the angle of contact for the liquid-glass interface will be ....... (acute / obtuse).
$(ii)$ The angle of contact between mercury and glass is .......... (acute / obtuse).

By adding soluble impurity in a liquid,the angle of contact

The parts of motor cars are polished by chromium because the angle of contact between water and chromium is

The value of the contact angle for kerosene with a solid surface is ........ $^o$.