Câu 12. CaO có ứng dụng nào sau đây A. làm vật liệu trong xây dựngB. Làm chất bảo vệ môi trường và khử chua đất trồng C. Dùng cho công nghiệp luyện kim D.Tất cả các phương án trên. Câu 13. Dùng chất thử nào để phân biệt các chất rắn, trắng sau: MgO, CaO, P2O5 A, Dung dịch NaOH B. Quỳ tím ẩm C. Dung dịch HCl D. Nước Câu 14. Hoà tan 1 mol H2SO4 vào 18g nước. Nồng độ phần trăm của dung dịch thu được là A. 84,22% B. 84.15% C. 84.25% D. 84,48% Câu 15. Trong 400ml dung dịch có chứa 19,6g H2SO4. Nồng độ mol của dung dịch thu được là A. 0,2M B. 0,3M C.0,4M D.0,5M

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