Consider the following reaction, 2M+12O2→M2O (M= alkali metal). Select the correct statement.
A
M can be Li and Na
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
B
M can be Cs and Rb
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
M can be Li and Rb
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
None of the above
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution
The correct option is AM can be Li and Na
On reaction with oxygen, lithium forms monoxide (Li2O).
4Li(s)+O2(g)→2Li2O(s)
and sodium,
4Na(s)+O2(g)→2Na2O(s)
The other alkali metals (K,Rb,Cs,Fr) form superoxide compounds (in which oxygen takes the form O2−) as the principal combustion products. The following equation shows the formation of superoxide, where M represents K,Rb,Cs, or Fr