The first statement says that all chocolates are biscuits. This means chocolates are a subset of biscuits. The second statement indicates that some chocolates are cakes, implying that there is an overlap between chocolates and cakes.
Conclusion I: ”Some cakes are biscuits”– This is valid because we know that some chocolates (which are biscuits) are also cakes. Therefore, some cakes must indeed be biscuits.
Conclusion II: ”No cake is a biscuit”– This conclusion is incorrect. Since some cakes are chocolates (which are biscuits), this directly contradicts the conclusion that no cake is a biscuit.
Conclusion: Thus, only conclusion I follows