Analyse the following statements and choose the correct answers.
 
1. As Shelly plays a “wordplay” with Ramesh. She put some concepts with similar words and different pairs. Which of the following concepts is correct about colloidal pair for shaving cream?
2. Teacher randomly selected four students and asked each one of them to find the odd use of centrifugation. If they answer correctly, the teacher will allow them to play. Three of them answered correctly. What would be the fourth student's answer?