Question

All members of group 14 when heated in oxygen form oxides. Which of the following is the correct trend of oxides?

• A. Dioxides $\mathrm { CO } _ { 2 }$ , $\mathrm { SiO } _ { 2 }$ and $\mathrm { GeO } _ { 2 }$ are acidic while $\mathrm { SnO } _ { 2 }$ and $\mathrm { PbO } _ { 2 }$ are amphoteric.
• B. CO, GeO, SnO and PbO are amphoteric
• C. Monoxides react with haemoglobin to form toxic compounds.
• D. All oxides burn with blue flame.

Answer 1

Answer: (A)

Dioxides $\mathrm { CO } _ { 2 }$ , $\mathrm { SiO } _ { 2 }$ and $\mathrm { GeO } _ { 2 }$ are acidic while $\mathrm { SnO } _ { 2 }$ and $\mathrm { PbO } _ { 2 }$ are amphoteric.

Answer 2

: Dioxides $\mathrm { CO } _ { 2 } , \mathrm { SiO } _ { 2 }$ and $\mathrm { PbO } _ { 2 }$ are amphoteric.