Hấp thụ hoàn toàn 1,12 lít (đktc) khí CO2 vào dung dịch Ca(OH)2 dư, chỉ thu được muối CaCO3. Khối lượng kết tủa thu được là (C = 12; O = 16; Ca = 40; H = 1) * 20 gam. 15 gam. 10 gam. 5 gam. Trung hòa dung dịch KOH 0,8M bằng 150,00 ml dung dịch HCl 3,0M. Thể tích dung dịch KOH cần dùng cho phản ứng là * 180,00 ml. 562,50 ml. 360,00 ml. 281,25 ml. Cho 1,95 gam Zn tác dụng vừa đủ với m gam dung dịch HCl 14,6%. Giá trị của m là (Zn = 65; H = 1; Cl = 35,5) * 14,60. 7,30. 7,50. 15,00. Cho 13,52 gam hỗn hợp X gồm MgO và Fe tác dụng vừa đủ với dung dịch H2SO4 loãng. Sau phản ứng thu được dung dịch Y và 1,568 lít khí H2 ở đktc. Phần trăm khối lượng của Fe trong X là (Mg = 24; O = 16; Fe = 56; H = 1; S = 32) * 43,49%. 71,01%. 28,99%. 56,51%. Cho 3,24 gam Al vào dung dịch H2SO4 loãng, dư thu được V lít khí H2 (đktc). Giá trị của V là (Al = 27; H = 1; S = 32; O = 16) * 4,0320. 2,6880. 1,6200. 7,3248.

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