The p-Block Elements

Which of the following elements lowest melting point?

• Sn

• Pb

• Si

• Ge

The amorphous form of silica is:

• Tridymite

• Quartz

• Kieselguhr

• Cristobalite

The correct statements among I to III regarding group 13 element oxides are,

(I) Boron trioxide is acidic.

(II) Oxides of aluminium and gallium are amphoteric.

(III) Oxides of indium and thallium are basic.

• (I) and (II) only

• (I), (II) and (III)

• (I) and (III) only

• (II) and (III) only

The correct order of catenation is

• Si >Sn >C >Ge

• C >Sn> Si ≈Ge

• Ge >Sn >Si >C

• C> Si> Ge ≈C

The alloy used in the contruction of aircrafts is :

• Mg-Al

• Mg-Mn

• Mg-Zn

• Mg-Sn