Dẫn khí H2 dư đi qua 8,14g hỗn hợp A gồm CuO, Al2O3 và FexOy nung nóng sau phản ứng kết thúc thu được 1,44g H2O. Mặt khác hòa tan hoàn toàn lượng A tren cần 170 ml H2SO4 1M thu được dung dịch B. Cho dung dịch B tác dụng dung dịch NaOH dư, lọc kết tủa và nung kết tủa ngoài không khí đến khối lượng không đổi thu được 5,2g rắn. Xác định FexOy và khối lượng từng oxit trong A.

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Question 1: My friend, Ping is a ___________ student. She always finishes homework on time. A. hard-working B. confident C. shy D. reliable Question 2: – What are you doing tomorrow? – I ___________ to my friend’s birthday party. A. go B. am going C. goes D. went Question 3: What does your best friend look like? A. He is funny B. He is kind C. He is clever D. He is handsome Question 4: It’s very _________ of you to help me. A. talkative B. active C. nice D. confident Question 5: Would you like __________ to the hospital to visit my mother? A. to go B. going C. go D. will go Question 6: ___________ you __________ an English class tomorrow? A. Do….have B. Are…having C. Will…having D. Is…have Question 7: What’s your classmate like? A. She’s patient B. She’s beautiful C. She’s tall D. She’s thin Question 8: Steve can deal with difficult exercises. He’s a __________ boy. A. creative B. intelligent C. sporty D. kind Question 9: Please be ___________ when you have to use fire to cook. A. handsome B. clever C. careful D. reliable Question 10: We should brush our ____________ twice a day. A. feet B. teeth C. hair D. toe Question 11: She is so ___________ that she doesn’t talk much to strangers. A. reserved B. clever C. active D. smart Question 12: The part between the head and the body is the _________. A. leg B. neck C. knee D. shoulder Question 13: That girl has yellow hair. She has __________ hair. A. black B. wavy C. blonde D. curly Question 14: Peter __________ a straight nose and fair skin. A. goes B. comes C. does D. has Question 15: I’m not very ___________ at Math. I love English instead. A. free B. friendly C. clever D. boring