JEE MAIN - Chemistry (2005 - No. 57)
Which of the following oxides is amphoteric in character?
CaO
CO2
SiO2
SnO2
Giải thích
These elements are called amphoteric which reacts with both acid and base.
Following elements are amphoteric
$$\left( 1 \right)\,\,\,\,Zn$$
$$\left( 2 \right)\,\,\,\,Be$$
$$\left( 3 \right)\,\,\,\,Al$$
$$\left( 4 \right)\,\,\,\,B$$
$$\left( 5 \right)\,\,\,\,Cr$$
$$\left( 6 \right)\,\,\,\,Ga$$
$$\left( 7 \right)\,\,\,\,Pb$$
$$\left( 8 \right)\,\,\,\,Sn$$
Here $$Zn,Be,Al,Pb\,\,\,$$ and $$\,$$ $$Sn$$ are mostly amphoteric.
$$B, Cr$$ and $$Ga$$ are less amphoteric.
Following elements are amphoteric
$$\left( 1 \right)\,\,\,\,Zn$$
$$\left( 2 \right)\,\,\,\,Be$$
$$\left( 3 \right)\,\,\,\,Al$$
$$\left( 4 \right)\,\,\,\,B$$
$$\left( 5 \right)\,\,\,\,Cr$$
$$\left( 6 \right)\,\,\,\,Ga$$
$$\left( 7 \right)\,\,\,\,Pb$$
$$\left( 8 \right)\,\,\,\,Sn$$
Here $$Zn,Be,Al,Pb\,\,\,$$ and $$\,$$ $$Sn$$ are mostly amphoteric.
$$B, Cr$$ and $$Ga$$ are less amphoteric.