Question 1

In reaction BF _3+3 LiBH _4 3 LiF +X ; X is

Accepted Answer

2 BF _3+3 LiBH _4 2 ~B _2 H _6+3 LiF

Question 2

What is x in the following reaction? Al ( s )+ NaOH ( aq )+ H _2 O ( l ) x+ H _2( ~g )

Accepted Answer

2 Al ( s )+2 NaOH ( aq )+6 H _2 O ( l ) 2 Na ^ + [ Al ( OH )_4 ]^ - ( aq )+3 H _2( ~g )

Question 3

Ge (II) compounds are powerful reducing agents whereas Pb (IV) compounds are strong oxidants. It can be because

Accepted Answer

Inert pair effect is more pronounced in heavier members like Pb. Hence, Pb (IV) compounds act as strong oxidising agents and are reduced to more stable Pb (II) compounds.

Question 4

The number of 3 C -2 e^ - bonds present in diborane is

Accepted Answer

The structure of diborane is In this structure, there are two 3 C -2 e^ - bonds. 3 atoms, B - H - B share two electrons and form an angular geometry, leading bent bond, also known as banana bond.

Question 5

Diborane ( B _ 2 H _ 6 ) reacts independently with O _ 2 and H _ 2 O to produce, respectively:

Accepted Answer

B _ 2 H _ 6 +3 O _ 2 B _ 2 O _ 3 +3 H _ 2 O B _ 2 H _ 6 +6 H _ 2 O 2 H _ 3 BO _ 3 +6 H _ 2

Question 6

Identify the incorrect statement:

Accepted Answer

The hydrolysis of Trialkylchlorosilane R _ 3 SiCl yields dimer:

p Block Elements (Group 13 & 14) — Previous Year Questions & Solutions