Ge⁴⁺+Fe²⁺Fe³⁺+Ge³⁺                                                                          ①

Sn²⁺+2Fe³⁺2Fe²⁺+Sn⁴⁺                                                ②

由此可以确定Fe²⁺、Ge³⁺、Sn²⁺三种离子的还原性由强到弱的顺序是（    ）

A.Sn²⁺、Fe²⁺、Ge³⁺                                    B.Sn²⁺、Ge³⁺、Fe²⁺

C.Ge³⁺、Fe²⁺、Sn²⁺                                    D.Fe³⁺、Sn²⁺、Ge³⁺

A.MnO₂  CuO  FeO                                      B.（NH₄）₂SO₄  K₂SO₄  NH₄Cl

C.AgNO₃  KNO₃  Na₂CO₃                            D.Na₂CO₃  NaHCO₃  K₂CO₃

A.澄清的石灰水与稀盐酸反应:Ca（OH）₂+2H⁺Ca²⁺+2H₂O

B.钠与水的反应：Na+2H₂ONa⁺+2OH^-+H₂↑

C.铜片插入硝酸银溶液中：Cu+Ag⁺Cu²⁺+Ag

D.大理石溶于醋酸的反应：CaCO₃+2CH₃COOHCa²⁺+2CH₃COO^-+CO₂↑+H₂O

A.磷酸的摩尔质量与6.02×10²³个磷酸分子的质量在数值上相等

B.6.02×10²³个氮分子和6.02×10²³个氢分子的质量比等于14∶1

C.32 g氧气所含的原子数目为2×6.02×10²³

D.常温常压下，0.5×6.02×10²³个一氧化碳分子所占体积是11.2 L

A.3∶4∶1             B.3∶3∶2               C.6∶7∶3             D.6∶9∶1

A.稀硝酸             B.稀盐酸                C.硝酸铜             D.氢氧化钠

A.NaHCO₃                 B.HNO₃                         C.AgI               D.HClO

A.胶粒直径小于1 nm                         B.胶粒做布朗运动

C.胶粒带正电荷                                D.胶粒不能通过半透膜

2

A.3∶4               B.3∶2                 C.1∶1                D.1∶2

A.HCl                          B.Cl₂                           C.NO₂                           D.NH₃