Mark the element which is invariably bivalent and whose oxide is soluble in excess of NaOH and its dipositive ion has a noble gas core:
A
Ca
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
Mg
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
Sr
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
Be
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
Open in App
Solution
The correct option is D Be All the elements Be, Mg, Ca, Sr are bivalent (A bivalent is an atom or ion with a valence of two). However, it is only the oxide of Be (BeO) that is soluble in NaOH and its dipositive ion has a noble gas core i.e of helium.