The correct answer is - Physical changes - A, C, E ; Chemical changes - B, D. Concept: Physical Change: It is a type of change in the matter without changing the chemical composition of matter. It is usually reversible. In the physical change, no new products are formed. Chemical Change: It is a change in the chemical composition of matter. It is usually irreversible. In the chemical change, new products are formed. Explanation: Milk is pasteurized - Physical change Milk is quickly heated to a high temperature and then quickly cooled during the pasteurization process. This high temperature ensures that all bacteria in the milk are killed, and the cooling ensures that the milk does not evaporate completely. This is a physical change because the process is reversible. Then the milk is set into curd - Chemical change The transformation of milk into curd is a chemical change that results in the formation of a new substance (lactic acid). The curd is formed as a result of a chemical reaction between lactic acid bacteria and casein. The resulting curd tastes different from the original substance. Furthermore, once the curd has formed, milk cannot be obtained from it. It is an irreversible change. Curd is churned in a centrifuge to separate butter - Physical change The process of shaking up milk to make butter is known as churning. Centrifugation is the scientific term for this process. This process is a physical process. The butter in milk is actually the fat portion. During the centrifugation process, the heavy fat particles are centrifuged at a place known as the butter churn or butter. Butter is heated to get clarified butter (Ghee) - Chemical change When the butter is heated, the emulsion separates and the fat separates from the water, forming two layers. This separated fat layer is commonly referred to as ghee. Ghee and butter have different properties, and we cannot extract butter from ghee. As a result, it is a chemical change. Filtered and packed - Physical change Ghee is filtered and packed after it has been formed. Filtration is a physical separation process that uses a filter medium with a complex structure through which only fluid can pass to separate solid matter and fluid from a mixture. As a result, the filtering and packing of ghee is a reversible process, resulting in a physical change.