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longdeptrai2004
2 năm trước
Câu 19.Chọn phát biểu sai? A.Iot là chất rắn,dạng tinh thể màu đen tím B.Iot có hiện tượng thăng hoa C.Khí oxi không màu,không mùi,không vị,hơi nặng hơn không khí D.Ozon tồn tại ở trạng thái lỏng,có màu xanh nhạt,có mùi đặc trưng Câu 20.Chọn phát biểu sai? A.Lưu huỳnh tồn tại trạng thái rắn,màu vàng B.Khí hiđro sunfua là chất khí,ko màu,mùi trắng thối,ko độc C.Khí sunfurơ không màu,mùi hắc,nặng hơn ko khí,tan nhiều trong nước D.Lưu huỳnh trioxit là chất lỏng ko màu,tan vô hạn trong nước Câu 21.Chọn phát biểu đúng A.Axit sunfuric là chất lỏng,sánh như dầu,không màu và bốc hơi trong không khí ẩm B.Khí clo màu lục nhạt,mùi xốc,rất độc C.Hiđro clorua là chất khí,nhẹ hơn không khí D.Ozon tồn tại ở trạng thái khí,có màu xanh nhạt,có mùi đặc trưng Giải hộ mình nhé,mình đang cần rất gấp
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