CameraIcon
CameraIcon
SearchIcon
MyQuestionIcon


Question

Select the CORRECT order:


Correct Answer
A
Thermal Stability : LiF > NaF > KF > RbF > CsF
Your Answer
B
Bond Angle : BF3 < BCl3 < BBr3 < BI3
Correct Answer
C
Rate of hydrolysis : SiF4 > SiCl4 > SiBr4 > SiI4
Correct Answer
D
Acidic Nature : Mn2O7 > MnO2 > MnO

Solution

The correct options are
A Thermal Stability : LiF > NaF > KF > RbF > CsF
C Rate of hydrolysis : SiF4 > SiCl4 > SiBr4 > SiI4
D Acidic Nature : Mn2O7 > MnO2 > MnO
(A) Higher the lattice energy, more stable will be the lattice therefore more difficult it is to break and hence higher will be its thermal stability. In case of LiF, both Li+ and F are of small size hence lattice formed due to them is most stable as compared to other alkali metal fluorides, hence the order follows : LiF > NaF > KF > RbF > CsF

(B) In case of sp2 hybridisation, bond angle is always 120 if no lone pair is present. Here we have been given BF3 , BCl3 , BBr3 , BI3, all of them have same sp2 hybridisation and none of them has lone pair hence bond angle will be same in all of them hence order becomes :
BF3 = BCl3 = BBr3 = BI3 which is not given in option. Hence, (B) is incorrect.

(C) Order of rate of hydrolysis will be same as order of Lewis acidic strength in case of silicon tetra halides SiX4. This is because the effect of π back bonding is less dominant over  I effect.
Hence, order is : SiF4 > SiCl4 > SiBr4 > SiI4 

(D) Acidic strength of oxides is proportional to oxidation state on central atom. Here oxidation state on Mn is as follows :
Mn2O7 = +7
MnO2 = +4
MnO= +2
Hence, order of acidic strength is : Mn2O7 > MnO2 > MnO
 

flag
 Suggest corrections
thumbs-up
 
0 Upvotes


Similar questions
View More


People also searched for
View More



footer-image