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Which of the following statement is incorrect ? a)Oxide of aluminium `(Al_(2)O_(3))` and arsenic `(As_(2)O_(3))` are amphoteric. b)Oxide of chlorine `(Cl_(2)O_(7))` is less acidic than oxide of nitrogen `(N_(2)O_(5))`. c)Oxide of carbon `(CO_(2))` is more acidic than oxide of silica `(SiO_(2))`. d)The correct increasing order of basic character of various oxides is `H_(2)O lt CuO lt MgO lt CaO`.

A

Calamine and siderite are carbonates

B

Argentite and cuprite are oxides

C

Zinc blende and pyrites are sulphides

D

Malachite and azurite are ores of copper

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The correct Answer is:
B
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