Answer
a) No
b) No
c) Yes
d) Yes
Work Step by Step
A solution is a homogeneous mixture of two or more substances.
a) Sand and water do not form a homogenous mixture. They are heterogeneous since sand could be easily filtered out of the water. Therefore they do not form a solution.
b) Oil and water also do not form a homogenous mixture. When we mix oil with water, they form two separate layers. Therefore they do not form a solution.
c) Salt and water form a homogenous mixture since salt completely dissolves in water. Therefore they form a solution.
d) Sterling silver cup is an alloy of a metal with silver. Since they form a homogenous mixture, they are a solution.
