The alkali metals form salt like hydrides by direct synthesis at elevated temperatures. The thermal stability of these hydrides decreases in which of the following orders?
A
NaH>LiH>KH>RbH>CsH
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
LiH>NaH>KH>RbH>CsH
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C
CsH>RbH>KH>NaH>LiH
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
KH<NaH<LiH>CsH>RbH
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution
The correct option is DLiH>NaH>KH>RbH>CsH 1.LiH<NaH<KH<RbH<CsH 2. Small anion forms stable compounds with small cations. Thermal stability decreses, when size of cation increases as B LiH<NaH<KH<RbH<CsH 3.Because size of the anion increases as Li+<Na+<K+<Rb+<Cs.