Answer: Open System
Explanation: It's an open system because the "Cup" is literally exposed to the surroundings. It will lose heat or gain heat or any other type of energy in its surroundings.
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Answer:
NOCl structure has geometry of trigonal planar and N has sp2 hybridisation. N is the central atom because it is less electronegative than O atom and Cl cannot be the central atom because it only forms a single bond. So, the central atom of NOCl is N and its hybridisation