Cho phản ứng của sắt với oxi như hình vẽ sau:
Câu hỏi: Cho phản ứng của sắt với oxi như hình vẽ sau:![](data:image/jpeg;base64,/9j/4AAQSkZJRgABAQEAYABgAAD//gA7Q1JFQVRPUjogZ2QtanBlZyB2MS4wICh1c2luZyBJSkcgSlBFRyB2NjIpLCBxdWFsaXR5ID0gOTAK/9sAQwADAgIDAgIDAwMDBAMDBAUIBQUEBAUKBwcGCAwKDAwLCgsLDQ4SEA0OEQ4LCxAWEBETFBUVFQwPFxgWFBgSFBUU/9sAQwEDBAQFBAUJBQUJFA0LDRQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQU/8AAEQgAowETAwERAAIRAQMRAf/EAB8AAAEFAQEBAQEBAAAAAAAAAAABAgMEBQYHCAkKC//EALUQAAIBAwMCBAMFBQQEAAABfQECAwAEEQUSITFBBhNRYQcicRQygZGhCCNCscEVUtHwJDNicoIJChYXGBkaJSYnKCkqNDU2Nzg5OkNERUZHSElKU1RVVldYWVpjZGVmZ2hpanN0dXZ3eHl6g4SFhoeIiYqSk5SVlpeYmZqio6Slpqeoqaqys7S1tre4ubrCw8TFxsfIycrS09TV1tfY2drh4uPk5ebn6Onq8fLz9PX29/j5+v/EAB8BAAMBAQEBAQEBAQEAAAAAAAABAgMEBQYHCAkKC//EALURAAIBAgQEAwQHBQQEAAECdwABAgMRBAUhMQYSQVEHYXETIjKBCBRCkaGxwQkjM1LwFWJy0QoWJDThJfEXGBkaJicoKSo1Njc4OTpDREVGR0hJSlNUVVZXWFlaY2RlZmdoaWpzdHV2d3h5eoKDhIWGh4iJipKTlJWWl5iZmqKjpKWmp6ipqrKztLW2t7i5usLDxMXGx8jJytLT1NXW19jZ2uLj5OXm5+jp6vLz9PX29/j5+v/aAAwDAQACEQMRAD8A/VOgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgBM0ALQAUAFABQAUAFABQAUAFABQAUAFABQAUAFABQAUAFABQAUAFABQAUAJuoAWgAoAKACgAoAKACgAoAQNmoA5bxv470X4daGdW1+7e0tDKlvGI4JbiaeV2CpFFDErSSyN/CiKzdaZaMzw38V/Cvi7TtS1Gw1hI4NL2/wBpLexyWctgdu7bdRTKjwNtw22VVbaVPRhWnLy3l3M6Ur1JGh4TvNXmTU11rUdJvr2O7ZEg0yF4/scZVXiilLSvvl2srb9se4OvyLU83wruCXuSXY62gYUAFABQAUAFABQAUAFABQAUAFABQAUAFABQAUAFAHzN+1l+0j40/Zp8La94sXwDp2teE9Pt4Gg1Ia6ySzTyXFvF5Etv9n/d/wCtlZXV3/1XO3dQB8X/APD8TW/+iSWH/g9f/wCMUAYviH/gsfqPiHVfDWozfC+OCbQtRfUYFt/ELKkrNa3FrslXyPmXbdM38PzKn92gDa/4fia3/wBEksP/AAev/wDGKAN/wB/wWN1rx5468OeGl+GGn6e2s6na6ct22rvKIPNmRN+zyk37d33dy0Afafwp+MfxD+JPjW9sLv4f6NYeFdNnurK78Taf4iubiJrqCV4ZbeCKfToGnZJY9rOMRff2uzLsoA93oAKACgAoAKACgD5w8cf8FAfgF8O9WvdM1r4i2ceo2cz289ta2d1dPHKhZWRvKiba25SKAPZfhx44074m+CNH8U6Ot3/ZGrQfa7N723e3kkiflJNjfMquvzL/ALLLUAcD+0v4d0bxX4a8M6bqHiy48Da7J4gtz4d8RwGM/YdWWKVrfesmElV/ni8pv9b5uz+Og0R5Pf8Axn8W6N4e+Ing/wAe3WmWPjPR7rSdPj8S+FtOhul1yO/laKCJLe6dYoLtlRlZZ3aKPzQ/zRUqsv3dNrrcmMeV3PH9A0/xKuqeDvAo1uXwbB4d+KzaVbReG7XSl2LJor3W9vLsIoGlVml4W3VP3r7vNZEkHTy+9Qk+0vwJk1FYlLpy/ifo6nCDndWbEth9IYUAFABQAUAFABQAUAFABQAUAFABQAUAFABQAUAfH3/BV3/kyXxh/wBfmnf+lcVAH4MUAFABQB6D+z3/AMl++Gn/AGMumf8ApVFQB/Qf+zV/yT3V/wDscvFv/qRahQB6xQAUAFABQAUAeS+N/jfBoWvP4Q8J6ZN428fbVZ9GspVSKxVh8st/cfMttF/vbpG/gR6APkP4q/8ABMfVPi1+0D4T8f8AiXWdOvINWvmuvGlnptsbWBBEi+Ulqn32V9vlO7tv+bze+xQD9CrO2h0+2it7eNIYI02RxRptVVX+FVoAqa/oWneJ7GXT9UsLXUrKZHjlt7yFZY2VkZHVlYH7yO6/7rMO9AHPWnwb8Aaf4Mu/CNv4G8OW/hG6k86bQYdIgSxlfcrbngCbGbcinlT91fSgDLH7OHwmW3ntB8MPBi2lx5fnW48O2eyXy/8AVbl8v5tm75f7tAHpSIEUKOlADqACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgDyH9qrUDpX7NnxSv/tJs7u08MapPZXKNsaKdbWTynjf+GTeV2kfNu+7QB3Op6T4b0WwuL6+sdKtbK0iaS4uLiGKOOGJVyzszfdVV/KgD52+JX7QnwT/4TP4UjSviX4C/s/8A4SW4/tY2mvWXlfZf7G1Lb5+2XHlfaPs/3vl8zyv4ttAHoP8Aw0N+zv8A9FM+GH/g/wBO/wDi6AN3wV4++E/xKv5rHwf4i8GeJ723j86a30W+s72SKPP3mWJm2ru20AV/2bHV/hzqzKwZT4y8VH/y4dQoA9YoAKACgDB8V+L9F8D+H7zW/EGqWuj6RZrvnvb2URRIPXdQB5F/avjv47EJop1H4bfDx/lbVrm38rXtWX/p3if/AI8Y/wDprKvm/wBxIvlegD07wJ8PPD/wx0FdE8N6XFplgrNOyqGd55WPzyyyvueWVv4ndmZqAOtoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKAGUAPoAKAPIvGgHxA+K+geD4x5uj6D5XiTWv7jyqzLYW7f8AbVXuP9n7JF/foA0vhR4l1Px3feJPEjzj/hGrm8+xaFb7F2vBAXSS63febzZfM287fKSJl++1AFH4x/8AJRfgV/2OVx/6j2s0Aes0Aea/FvxRqfgaDw14itrrytCs9Ygg1yAorK9ncfuPN3H7vlSywSs39xJaAKHgsnwN8Y/FXhRwU0zXo28U6Un8KS70i1CJf+2r28/+9evQB6zQAUAeS+N/jfBoWvP4Q8J6ZN428fbVZ9GspVSKxVh8st/cfMttF/vbpG/gR6AK3hb4J3ep69ZeLfiVqcfjLxZav5ljapF5Wk6M3/TrA33n/wCniXfL/d2L8lAHsGz/AGaAH0AFABQAUAFABQAUAFABQAUAFABQAUAFABQAUAFABQAUAJuFABQAtABQBgeMPFlh4I8L6rr+qzNDp2mW0l1O6KWfYiFjtX+JuOFoA8SubLX/AA78OItNaR9O+JnxO1T/AEyWFw8un+an75lb/pys4hEj/dZ4Yv4peQD3Xw/oVj4Y0Ww0jS7RLPTNOtY7Wzgi+7FEi7URfoqrQB4b+118TdG+DM3we8Xa/wDaG0qw8aNG6WUPmys8ujarBEqp/vyrQB9EbqAMXxb4bsPGnhfWPD+qRi403VLSWxuov70UiFH/APHWoA8CvNb1O5+Dfh3xrqBkuvF3wz1GSLXHUfPcRWxa21J9vVlltd90ifxN9noA948SeNNA8IeGrrxFrmr2WlaFbx+bLqFxMqQqn97fQB5J/avjv47EJop1H4bfDx/lbVrm38rXtWX/AKd4n/48Y/8AprKvm/3Ei+V6APTvAnw88P8Awx0FdE8N6XFplgrNOyqGd55WPzyyyvueWVv4ndmZqAOtoAKACgAoAKACgAoAKACgAoAKACgAoAKACgBp60AfOPw1+H3hew/bA+LmtWvhrSrbWRpWjSrfw2MSzI8/2v7Q+4Lu3y7V3t/FsXd92miJl34zeLJ/Gur698N9N8F2/jq30ywtdY8SWN3qv2IPA07Pb20KeRKs8kv2WUeU7RJtCq0g3/LEJKMpyfQ2lBuEF32OP+Hv7Y/i/wCLGrahpfhH4QvJJBpK63Y3Ota+thDf2bT3MUTIot3lRpVt1ZFeJfvtu2qqPLTi7TT3Vr/MiatKDWzvb5Hpup/tE2MH7M8/xk0XQr/W9PXQjrselebFBOV2BmR2Ztq7Pm37dx+Rtiu21WnER9jd9rfiVRXt5Rj3ueea1+2B4g8PyXEeo/Dq2tJYl0K9+zSeI8yix1O7e1V22W7L58UqpviVmTa+fN/hrf2fOpLsRUfs1GXcu337YM/hvxp8QtK17wRc2ul+CJ7h9X1fTp7i7gjs1sluoZQzW0UXmy70i8jzdys275kDNWL92jzGnJfTuYuofHW5+Bvja61fxn8ME0nWfFls2rahqei6s2pJHYWVk/yvK1rDteKXyIvKbCbr4MkrfOqtRao2/k/UVr+93/Q928BeKPHGtalqdr4s8FWfhmGGOKWyvbDXF1GK637t0TZiieORNq7vlZPm+V25quhgqlzvxgis2aLU8j8dqPiL8UvD/gpRv0fRRF4k1v8AuSOsv/Evt2/3p4nn/wC3Rf79UMPh648f/EvxJ45k+bS9PMvhjQs/xLHN/p9wv+/cRJF/u2St/FQB67QB8hf8FOv7MT9mu2Fxqi6Jq7eJtL/sXUM7GgvPtAbzVl/5ZbYhcNv/ANmgD1L9knx1r/xI+A+ga14ot57fW/OvLSZLz/XJ5F1LCqyn+J1EYRm/iZGbvQB7XQB8w+LfinF8PP2h9d8JeGdLi8a6340sYp5NCivIoobPUYI9jNeSt/qlmslibZtZttk2xG30AVv2cvhAkd29h8QbuXxT4v8Ah/dR6bplvdHdp2m2wgR7W4s4P4mMTqn2iXfLuilUMv3aAPqTZ/s0APoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAaetAHi9x+zter8QfEnjHS/ir440PUtdSCK6t7JNIkt0ig3+TEiz2EjKF81/m3Fmz8zNgU0RPYh1H9mTT5L+w1DRPGXizwnq1vocfh+71PS7i1lm1O1Q7k+1faYJkeVWaVvNVUfMr/ADc4EuzlNPZ7m0Jvlg+q2PMtN/Z312y/aBu7Tw1B4u+HPw9svB1h4bsNY0K+0xknWCWZmiZZ/tE6/JKm2Xy1k3K/zr95yD5lOUt3b8CK0rOnFdL2+Z7l4m+Ceh678Fbr4W2Ul34b8Mz6d/Y6f2UYzPDaFdjIrTLKPmXchZlZvnJyG+apxD9tdPrb8B0ZOjKMl0v+J5/qv7HOi+IrzUrnV/HPi29mvdJ07RwT/Z8fkJYXCXFrNHss1/erMrv825G8xhs27VXf2nIpNdSJr2iin0Og8Ofsy6No8PxAg1rxBr/jOx8eRKuu2uvPbbJ2+zrbu6m2ghaNmiRV+Vtq4+RVrJ+9S5TXntr2Ob+G/wAFPh/8SfClrrs3jXWfjD4fvtAm0DT73WLu2dYLGfYtxEjWsMDeY+yNXeXdKpixuQ79yUual/i/QL2XL2PUfh98N73wGoivPHHiXxiscK29v/b8ttmCNcd4LeLzWO1fnl3tx975m3adDnVPW50XinxJp3g3w1quvarMLbTdNtpbu5lPzbYkXc1ZM1Wh4oG8Q+DPhdPebfsPxU+I+pqkULje1jdToFRf9tbKzi3t/e+yu38dWB7P4Q8Kaf4G8MaXoGkwtDpumW0VtAjnc+xF2jc38TUAdBQB8Yf8FStJt9U+AXhZZT51yvjGxW1sDHJJ/aDSQ3ED2/7v5/millb5efkxQB6x8AfHFhoP7LPgvxL4nurDwzY2+jxfaLuYxQQBF+RZRt2p+92q/wAnDb/l/hoAeNS8dfHMFdL/ALQ+HPgCX/mJTReVruqJx/x7xsP9Bib+/L+//upF8r0AL8RPhdpvw++E8Nx4H0dLO68H3i+J7G2t03y3UkW/7QjMx3Sy3EDTxb3bczS7mbvQBd17VrXQPih4I8eadOs+geLbWLw9fXCco27dcabP/u73uIv969SgD2agAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKAPxc/4JxeE/2gfBfxV8PxeH5R4S8KeI4Jb6Wz8WRSrZ6tbQNCsz28X3mnVZU2su35R95kVhQB+0dAHkPxAJ+InxJ0DwJGGfStM8rxJ4gyRtZEl/0C1Yf9NbiJpf92yZG/1tADvCqD4i/GHW/E7fNo/hZZfDmlY+7NdMyPqE/vtZIrdf7rRXH9+gD1ygAoA+Lf8Agqbp1rqfwH8JxzJJc3ieM9ONnYLHK322VoriJov3TK/+reVvkbd8lAHov7O3gK08f+Afh74/8Wx3Gs67BpdudMt790aysNi7FuLWBFWNZZUVH83G75vl2L8tAH0VQAjIH+8tAHgHhbwUmu/Dnx/8HJZzYXHh65aHR7sL89rayn7VpVxF/wBe7/uk/wBqyoA9P+E/jNviH8PdG1ue2Wy1C4jaK/ss5+y3kTtFdW//AGynSVP+A0AdpQAUAU2v7ZLtLVp4xdMhkWIv8+3+9t9KALX8JpMDkviZ8Q9E+E3gbWPF/iO5az0bS4fNnkRS0jc7URF/iZ2ZUVe7MKzZcdTzLXvj54q+H+l2/ijx/wCAbXw54CkuIo59QtPEH23UNLWV1SKW9tRAkaINy+Z5E8+zd/GoZxotHy9TJ6nvCsGUEHin5dQ2JKCgoAKACgAoAKACgAoAKACgAoAKACgAoAKACgDyn4/+ENW8Q+EbXWfDMHneMvC12uu6Km8p58sSOstqzf3biJ5YP+2ob+GgDe0b4peHNU+F8PxBivRB4Vl03+2Gup/kMUHleYxdf4WUbty/3hQB5ra3+ueAvhbq3iiW0VPib47vke0025Xd5F5OqxWVq2P4bWBE83b/AM8riX+I0Aet+A/B1n4A8JaV4d08yvbWECRebO26aZ/vPLK38TuxZmb+JnagDp6ACgD4b/4KVvZePtA8J/D6OPfrtvdN4uVbiKZ7ZrW2/wBFa3l8r95uuGvfKRU+++1Nyb1agD6O/Zn17VfE3wD8C6pra41C40uHc/yfvV+7FL8ny/Om1/k+X5vl4oA9A1VNQk025j06WGDUGjb7NPcxtLEsm35WZFddy7v4dy0AeU/2L+0T/wBDj8MP/CS1H/5ZUAeZ+NdH+Ongn4keGvFU/ir4d79a2eFbyePwzfLAm9nltGlX7fub97viT5/vXn3W3fIAJ4c0j47eCfivrXhq38U/D6IeJ45PE9s83hq/aD7QnkwXcUSfbxs/5YS/ebe1xK3y0Aem/wBi/tFf9Dl8Mf8AwkdR/wDllQAf2L+0T/0OPww/8JLUf/llQB8I/wDBQXwF+0R4n+L3woi0W5g13xhFb302nXHw/wBNudNazXfBvaWWS6l2/wAHz70WgD7j/ZT0L436D8P1h+N2vaLrWuFV8gafB/pES/3Z5V2xyN/uJ/wJqTCRr/tT/DDV/i58D9b0Dw88K6+stpqOnpcNthkntriKdI3b+6/l7P8AgVZs0gzzr40+L9T/AGhfhBrnw18PeDfFOmeJvEkC6be/29olzY2WjxM6rcTPdyKsFxs+baltLKZTt2/JuddJ6adO5jT8y4b74RR/tH+H9J0fW9Ht/iboy7NQlhvI21O/ia1eJLCVd3myr924ZfuxfZ0Ztu6tKTfLy9BVND6ZqCwoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoA+RY7L7B+0XcfA5bmBPB2o3C/EJbcy/P5XnM02mov91r9Euv9qJrhPu0AevaYf+FjfG691JiX0PwOG02z/uy6pPEjXEo/65QMkSt/euLhf4aAPXKACgAoA/Hv/gqz8ZPFPgf9pS00nTJ9N/s//hHIG8rUdFs7/b5ssu9VeeF22t5SZT7vy0Afcv8AwTy+JfiT4tfsreG/EnizV31zXbq5vI5LuVFT5Y7h0RdqhV+VVX7ooA+n6ACgDjfip4JPxE+H+u+HknFld3kDfY7tfv2t0vzwTr/tJKqP/wABoA8w8W+LZ/GXwV8K/FW1tGg13wrKutXdjD87x+Vug1Wy/wBp0i+1Js/56xJ/doA90s7631CzhuraVZ7edFkilQ7lZW+61AF2gBiUAPoAYn3KAFYbloAdQAUAFABQAUAFABQAUAFABQAUAFABQAUAFABQAUAZGva7YeGNE1DWtUuI7HTbCCS5uriVvkiiRdzO30VaAPl74i+GdX034LzfE5rWaz+Kt1r1r4j0exYbpvtEuy1tdIZR/C9q/wBnlVfl3ySy0Ae2fs+LpH/CmfCl1o98+p2V/YpfyajMu2W8uJ/3txcSj+GV5XlZ1/hYsKAPTKACgAoA/EH/AILJf8nbWX/Ys2f/AKNuKAPrf/gm/wCKPiH4V/ZH8JT6P4IsvGfhf7RfZTTdVW11WNvtcu7EVwqQSL/23WgD6r0X9pXwJqGpRaRrGo3PgnXrhtkWl+MLV9Lmlb+7E0u1J/8Atk70AetK6v8AdOaAHUAeR+CETwb8XvGPhCVcabra/wDCUaUrfc3ufK1CJP8Adl8qdv8Aa1CgBfgIzeHNL1v4eTswl8G3n2Kz7b9MlXzbJ1/2Uib7P/vWr0Aet0AFABQAUAFABQAUAFABQAUAFABQAUAFABQAUAFABQAUAFABQAUAeR/E4f8ACfeNtA+HkRL6eu3X/EOO1nFLi3t2/wCvi4T/AIFFa3C/xUAJMp+I3xzSLO7QvAKiVvSXWLmD5V/7YWsu7/t9T+7QBk/DpT8KPjF4i+H8haLQfEHn+KfDf92N2f8A4mVqv+7LKlwq/wDT0/8AcoA9zoAKACgDJuPDmmX05nudNtJ5mHzSy26M/wD31QBYtNOtdOg8qzto7aLdu2QpsX/x2gCDXdC03xLpVzpur6ba6tYXC7ZbS+gWaGRf9pG+VqAPLX/Zo0rw2yy/D3xDr/w1kTpaaHd+bppH937BcLLbov8A1ySJv9qgBh1r40+BVYap4f0T4maao/4+/Dk/9lamf+3W5doG/wDAhP8AdoA8/wDip+0Z4Ksb7wn4kvby78H+JvDmqK8+j+KLOXTbm7sJ/wBxepF5mEnREZbn90z/ADWiUAenePSngn4r+D/Gkb+Xp+rFfCmsMPufvX83T5X/AN2ffAvvqFAHrlABQAUAFABQAm6gA3D1oAWgAoAKACgAoAKACgAoAKACgAoAKACgAoAytZ1qy8O6Pe6tqVzHZafYQvdXVxM21YokXc7t/uqKAPH/AAtr0vgH4X+JfiX4h0+4PiLxFL/ah0s/JcHfti03TV4+WXYbeLb/AM9ZZW/joA7z4SeC7jwN4HsbC/ljvNdnd7/WLxEwt1fzuZbiVfRN7PsX+FAi/wANAGF+0B4R1XxB4PtdZ8NQibxl4VvF1zRU+79oliVhLaf7txA0tv8A9td38NAHXeBvG+l/EPwjo3ibRZfP0vVLSK7t3k+V9rqGCsP4WX+JfagDqKACgAoAKACgAoAKAMXxL4Z0rxlod7o2t6bbappN7E0NxaXcQlilRvvKy0AfKPgH9lzS/Enwl1fwTo/ibxF4G13QbmXQb9dMvTLaSywbWtLprOffFE8sTWt1ut1ibe/3vloA7H4YfFH40T+CdO1jWPCujePFTzLTUIfDlx/Z2pWt1DM0VxF9luW8iXY6Ou/7RFu2/Ki7qAO70X9pXwJqGpRaRrGo3PgnXrhtkWl+MLV9Lmlb+7E0u1J/+2TvQB60rq/3TmgCv58YmdDIodVDMmfuqf8A9lqAJ99ABQBzHjK+1vTtAnu9C0201fUUZMWt3ey2quu75vnSKVt237q7Pvcbl+9QB09ABQBla1ren+H9Ju9U1a9t9M02zia4uL27lWOGCJFLM7u3yqq/3qVwNCGWOaJZImV4mXcrq33qYEtABQA+gAoAKACgAoAKACgAoA8P+Putx6xd23hBY2udPtrOXxN4jhjbltOtctFb/wDbxOqL/tRQ3C0AecWuh/Ff4taz4Ln1jUdYsbCMwa7FqtjouknRY7h7RnRSjX7XjrE0rKu+L/Woj/wq9AHaf2d8ZP8AhPP7B/4SLX/7K/6Gn+wdE/s//Vb/ALn237V9793/AKj73+x89AB/Z3xk/wCE8/sH/hItf/sr/oaf7B0T+z/9Vv8AufbftX3v3f8AqPvf7Hz0Acz4H+GfxT8A+LtR8J6V4g8RxeGr3UrjUl13+w9G/sy3edftEqIn237UqtcNL/y7/fl/u/PQB039nfGT/hPP7B/4SLX/AOyv+hp/sHRP7P8A9Vv+59t+1fe/d/6j73+x89AB/Z3xk/4Tz+wf+Ei1/wDsr/oaf7B0T+z/APVb/ufbftX3v3f+o+9/sfPQAf2d8ZP+E8/sH/hItf8A7K/6Gn+wdE/s/wD1W/7n237V9793/qPvf7Hz0AH9nfGT/hPP7B/4SLX/AOyv+hp/sHRP7P8A9Vv+59t+1fe/d/6j73+x89AB/Z3xk/4Tz+wf+Ei1/wDsr/oaf7B0T+z/APVb/ufbftX3v3f+o+9/sfPQAf2d8ZP+E8/sH/hItf8A7K/6Gn+wdE/s/wD1W/7n237V9793/qPvf7Hz0AH9nfGT/hPP7B/4SLX/AOyv+hp/sHRP7P8A9Vv+59t+1fe/d/6j73+x89AB/Z3xk/4Tz+wf+Ei1/wDsr/oaf7B0T+z/APVb/ufbftX3v3f+o+9/sfPQBg6b8PvinpXxj1g2uu+I4odWjt4rzxN/Ymjf2S7QxO6v5f2z7Tv+byN3kfwJ/Au+gCX9nvxXrOl/Ffxt4d12W1l/tbULqe2vLS38iG4vbPyYLtvK3t5TPE1nLt3fM/2p/wDdAPofXdC03xLpVzpur6ba6tYXC7ZbS+gWaGRf9pG+VqAPLX/Zo0rw2yy/D3xDr/w1kTpaaHd+bppH937BcLLbov8A1ySJv9qgD8zrr45ftIaV+2Z4i8c+EPDmv/EK2tZ10K6TSfD9zHpmrWVq3lbti+b5W9t8qvv+Vpd33WKUAfZvxx8Nt4g1DwL8cPDvg+50P4jeGtJvNflsLuzWHUL2CBreK4sJ9v328iW4ROT823b8rVlHU0k7Gl+2L4p074s/syeJrfQL+S60O58Iy+J7m7tZdu612b7JW/j/AHrqzf7SW8qN96umNK4R2Lf7S+reHvg98O7OxuvAPhr/AIVroto1ykV74hj0GJ7rDukGnRRRM0l4ipNKn+o2vsdH3ruizM6cdD1NfiZq2m/FLw34J/seG807WvD11qtnr82o7biSW2a3R4pYBBtXd9oRt6u3RvkoCEdS98GviPqfxN8DXWrX+iW+h6ra6lf6XNp8OoNdQiW1upbdmSfykLK3lbs7P4qiX8EbjasfPGs+IPFvxa/ZB+NrfE7QvDV0tlFrsNo1jcteL5trLcRL+6lgTyvKaJNku5nbG/8AdNXPZ+xujqhH99Y9u8BfFLWW8Z6H4T1rwwukWmq6LJqOj3w1BZriVYDAkyXFuE2wN/pCMm2WXcv3tjfLXYtjjjHVmT4I/aG1LW/jDL8P9e8P6PpOtSabdarHpum+JotR1C1SJ4QsV7brEi20kqTo67ZZV+R/n6MwW4mR4d/ai8Sa34at/Et98NZND0CLxO/hvUW1DXYDd27/ANoLZRSxRRI6S/vW/eq0seza+zzV2s0QLnSsfSPaqMUrDqBhQAUAFABQAUARs+xN3X/doA8B8FWtx40+BfjLx4Ue41j4gaVPqsESje0Vk1qy2Fqv+7FtZl/56yy/3qAMj4X6/omq/DTwp4DGk+Kn8LXGkWs3/CY2vi+KOE7olufluk1L+0VXzf3Xypj+D/VUAdX/AGpom3/hWf8AZHi//hFf+hw/4TRP+vj/AI/P7S/tP7/7r7v+x/qqAD+1NE2/8Kz/ALI8X/8ACK/9Dh/wmif9fH/H5/aX9p/f/dfd/wBj/VUAH9qaJt/4Vn/ZHi//AIRX/ocP+E0T/r4/4/P7S/tP7/7r7v8Asf6qgA/tTRNv/Cs/7I8X/wDCK/8AQ4f8Jon/AF8f8fn9pf2n9/8Adfd/2P8AVUAH9qaJt/4Vn/ZHi/8A4RX/AKHD/hNE/wCvj/j8/tL+0/v/ALr7v+x/qqAD+1NE2/8ACs/7I8X/APCK/wDQ4f8ACaJ/18f8fn9pf2n9/wDdfd/2P9VQAf2pom3/AIVn/ZHi/wD4RX/ocP8AhNE/6+P+Pz+0v7T+/wDuvu/7H+qoAP7U0Tb/AMKz/sjxf/wiv/Q4f8Jon/Xx/wAfn9pf2n9/9193/Y/1VAB/amibf+FZ/wBkeL/+EV/6HD/hNE/6+P8Aj8/tL+0/v/uvu/7H+qoAP7U0Tb/wrP8Asjxf/wAIr/0OH/CaJ/18f8fn9pf2n9/9193/AGP9VQAf2pom3/hWf9keL/8AhFf+hw/4TRP+vj/j8/tL+0/v/uvu/wCx/qqAD+1NEx/wrP8Asjxf/wAIt/0N/wDwmaf9fH/H5/aX9p/f/dfd/wBj/VUAeWaVpdr4N+DvjfxdpFxcXkXgHxtqPiG0urnUZb2We2g+S9ie4ld3lZ7drqL52b59v92gD69V96bun+9QBJQAzZQB59qPhHxhefE7S9fh8Q6ND4dtbSW1l0mbRJZLuVZdjP8A6T9qVF+aKLH7js3rxlHQJHmWsfsn/ZPgn4x+HHhDxONDs/FFxdefcavYS6kLKyn3D7Laxi4i8pIt42fMyr8/yfNXSqlgix/jv9m7xV8QJdZur3xxpUV/rvhOXwrqc6eHHYQo3nMZbINef6NvMsXmq3m+b9ni+7tqGFOVkdJrXwl8X6hL4I13T/F2i2fjPw7ZXWnSXtxoE0+n3lvP5W//AEVb1HjfNvFtbz2/j4+b5Uwpy941fgh8J734Q6JrGmXfim+8VtqGrXuqrNe21vb+SZ5nlZFWJF3ff+Zmz8xO0IuEXP8A5clTnetc5W//AGfteuPhf8R/A9n4vsLex8U3Goy2txcaG8klhFfSvJcrKFul89v3r7H/AHe35dyvTSXsbAqjVa5eg+D/AIyk+IXgnxNf+M9Fkh8PaPdaRPaWnh2eJ7ozmLfIkrXr+Vj7PFtXa/8AH97cuwuRGWpznw7/AGb/ABT8PdX8Czw+OtHu4PC1nfabFE/hl4nvYLpreV5Z5FvPmumlt97z/dkZ2Ji3fNRc0crleT9mfx5J8Krrwe3xE0P7VP4r/wCEmbUf+EUl2f8AH/8Ab/I8r7f937R/Fv8A9V8v3vnp0yp1bn0larJHAizsrzbV3uq7VZvatGYp3LVSMKACgAoAKACgAoA8eg+Gnjnwap03wJ4y0LSPDKytLbaZr/hyXUmsi7uxiglivbfbF83yo6ts+6rbNiqAeeax+yVqniHUDqOp2PwT1C9Zmd5bj4UyO8rN1Z92rfN/wKgBn/DGs/8A0A/gJ/4Z3/760AH/AAxrP/0A/gJ/4Z3/AO+tAB/wxrP/ANAP4Cf+Gd/++tAB/wAMaz/9AP4Cf+Gd/wDvrQAf8Maz/wDQD+An/hnf/vrQAf8ADGs//QD+An/hnf8A760AH/DGs/8A0A/gJ/4Z3/760AH/AAxrP/0A/gJ/4Z3/AO+tAB/wxrP/ANAP4Cf+Gd/++tAB/wAMaz/9AP4Cf+Gd/wDvrQAf8Maz/wDQD+An/hnf/vrQAtn+x9d2E0s9rpnwQhml+9t+E8u3/vn+1floA7jTvg14ov7Cx8O+KvE3hmbwXburt4e8KeFX0hLhUbesMrPe3H7jdyyIqb/us2xnVgD26gAoAKACgBlABQAUAPoAZQAUAFABsoAfQAUAFABQAUAFABQAUAFABQAUAFABQAUAFABQAUAFABQAUAFABQAUAFABQAUAFABQAUAFABQAUAFABQAUAFABQAUAFABQAUAFABQAUAFABQAUAFABQAUAFABQAUAFABQAUAFABQAUAFABQAUAFABQAUAFABQAUAFABQAUAFAH/9k=)
A. giúp cho phản ứng của sắt với oxi xảy ra dễ dàng hơn.
B. hòa tan oxi để phản ứng với sắt trong nước.
C. tránh vỡ bình vì phản ứng tỏa nhiệt mạnh và oxit sắt có thể rơi xuống đáy.
D. Cả 3 vai trò trên.
Câu hỏi trên thuộc đề trắc nghiệm
Đề thi giữa HK2 môn Hóa học 10 năm 2021 Trường THPT Hoa Lưu A