SOF NSO · Problem Solving · Quiz
5 real SOF NSO questions on Problem Solving. Instant scoring and solutions, no signup — see where you stand in ~3 minutes.
Question 1 of 5
HARDA mixture contains salt and sand. A student wants to separate them. She dissolves the mixture in water, filters it, and then heats the filtrate. However, she notices that some salt crystals remain in the filter paper. What is the most likely reason for this error?