Multiple choice question

Boxite having impurity of SiO 2 is heated with cock in presence of N 2 at 1800°C
which gives .............. and silicon vapourises to seperated out.
12 lisZd fof/k esa cus AlN ds ty vi?kVu ls -------------- izkIr gksrk gS ftls xeZ dj
Al 2 O 3 izkIr fd;k tkrk gSA
In Serpek’s process AlN formed on hydrolysing gives ........ This on heating
gives Al 2 O 3
13 H BO 3 3 HBO2 H B O 2 4 7 B O 2 3
vkFkksZ cksfjd vEy esVkcksfjd vEy VsVªkcksfjd vEy cksfjd ,ugkbMªkbM
mi;qDr lehdj.k esa rki dh fLFkfr;k¡ n'kkZb;s\
Show temperature conditions in the above given equations?
14 lewg 13 ds rRoks ds dqN vkWDlkbM tyh; foy;u esa uhys fyVel dks yky
,oa yky fyVel dks uhyk djrs gS\ bl izdkj ds vkWDlkbMksa dk foy;u -
----------------- dgk tkrk gSA
Some elements of group–13 form the oxides whose water solution turns
blue litmous red and red litmus solution to blue such a solution of these
oxides is called ......................
15 tksM+h cukb;s& Match Column A with B
B 2 O 3
TiO 2
Al 2 O 3
A B
Ga 2 O 3
In 2 O 3
4 4 ,oa ,oa 5 5 vad vad okys okys iz'u
iz'u
me;/kehZ & Eraphoterric
vEyh; & Acidic
{kkjh; & Basic
{kkjh; & Basic
me;/kehZ & Eraphoterric
iz'u&16 fdlh oxZ esa ijek.kq nzO;eku c