Question

Which of the following statement is incorrect ?

• A. Oxide of aluminium (Al2O3), and arsenic (As2O3) are amphoteric.
• B. Oxide of chlorine (Cl2O7) is less acidic than oxide of nitrogen (N2O5).
• C. Oxide of carbon (CO2) is more acidic than oxide of silicon (SiO2) .
• D. The correct increasing order of basic character of various oxides is H2O <CuO<MgO<CaO.

Answer 1

Answer: (B)

Oxide of chlorine (Cl2O7) is less acidic than oxide of nitrogen (N2O5).

Answer 2

(2) $\overset{+ 7}{C}l_{2}O_{7}$having higher oxidation state is more acidic than ${\overset{+ 5}{N}}_{2}O_{5}$having lower oxidation state.