- Home
- Standard 12
- Chemistry
General Principles and processes of Isolation of Elements
easy
Three most occuring elements into the earth crust are
A
$O, Si, Al$
B
$Si, O, Fe$
C
$Fe, Ca, Al$
D
$Si, O, N$
Solution
Three most occurring elements into the earth crust are $O , Si$ and $Al$.
Hence, Option $"A"$ is the correct answer.
Standard 12
Chemistry
Similar Questions
Match column $(I)$ (process) with column $(II)$ (electrolyte)
| $(I)$ (process) | $(II)$ (electrolyte) |
| $(i)$ Downs cell | $(W)$ fused $MgCl_2$ |
| $(ii)$ Dow sea water process | $(X)$ fused $(Al_2O_3+Na_3AlF_6)$ |
| $(iii)$ Hall – Heroult | $(Y)$ fused $KHF_2$ |
| $(iv)$ Moissam | $(Z)$ fused $(40\%\,NaCl\,+\,60\%\,CaCl_2)$ |
Choose the correct alternate :
normal
