4. Was the chief engineer showing the plants to the workers?  .............................................................................................................................................................................. 5. Were they asking that question?  .............................................................................................................................................................................. 6. Is Mary cutting the cake with a sharp knife?  .............................................................................................................................................................................. 7. Will they hold the meeting tomorrow?  .............................................................................................................................................................................. 8. Must they have learnt English words?  .............................................................................................................................................................................. 9. Has anyone ever treated the boy with such kindness?  .............................................................................................................................................................................. 10. Had they fastened him to the tree?  .............................................................................................................................................................................. 11. When does she often take her dog for a walk?  .............................................................................................................................................................................. 12. What did the manager ask new employees?  .....................................................................................................................................................................

Nung nóng hỗn hợp bột X gồm a mol Fe và b mol S trong khí trơ, hiệu suất phản ứng bằng 50% thu được hỗn hợp rắn Y. Cho Y vào dung dịch HCl dư, sau khi các phản ứng xảy ra hoàn toàn, thu được hỗn hợp khí Z có tỉ khối so với H2 bằng 5. Tỉ lệ a : b bằng:

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