The metal present in quicklime is calcium. The chemical formula of quicklime or calcium oxide CaO.

Sodium chloride is a pure substance because it has fixed composition(1:1) and other given options are mixture.

Class IX Science MCQ Extra Questions Answers Class 9th Science Session 2022-23 9th Science Terminal Exam Based MCQ Extra Questions Class 9 Science Terminal Exams MCQ Solutions

Class 9th Science Session 2022-23 Class 9 Science Terminal Exams MCQ Solutions Class IX Science MCQ Extra Questions Answers 9th Science Terminal Exam Based MCQ Extra Questions

When the velocity of an object decreases with time, it is called retardation or de-acceleration or negative acceleration.