1
The reaction of solid XeF2 with AsF5 in 1 : 1 ratio affords
A)
XeF4 and AsF3
B)
XeF6 and AsF3
C)
[XeF]+ [AsF6 ]-
D)
[Xe2 F3 ] [AsF6 ]-
Answer & Solution
Answer: Option
B
2
The number of hydroxyl (OH) groups present in phosphorus acid is
A)
one
B)
two
C)
three
D)
four
Answer & Solution
Answer: Option
B
3
The reaction of ammonium chloride with BCl3 at 140°C followed NaBH4 gives product X. The formula of X is
A)
B3 N3 H3
B)
B3 N3 H6
C)
B3 N3 H12
D)
[BH ... NH]n
Answer & Solution
Answer: Option
B
4
The first ionization potential of Mg, AI, P and S follows the order
A)
Mg < AI < P < S
B)
AI < Mg < P < S
C)
AI < Mg < S < P
D)
Mg < AI < S < P
Answer & Solution
Answer: Option
D
5
Among the following diatomic molecules, the one shows EPR signal, is
A)
Li2
B)
B2
C)
C2
D)
N2
Answer & Solution
Answer: Option
B
6
The Lewis acidity of BF3 is less than BCl3 even though fluorine is more electronegative than chlorine. It is due to
A)
stronger 2p (B) - 2p (F) σ-bonding
B)
stronger 2p (B) - 2p (F) π-bonding
C)
stronger 2p (B) - 3p (Cl) σ-bonding
D)
stronger 2p (B)- 3p (Cl) π-bonding
Answer & Solution
Answer: Option
B
7
Which one of the following will show closo structure?
A)
B5 H9
B)
B12 $${\text{H}}_{12}^{2 - }$$
C)
B4 H10
D)
B5 H11
Answer & Solution
Answer: Option
B
8
The correct classification of [B5 H5 ]2- , B5 H9 and B5 H11 respectively is
A)
closo, arachno, nido
B)
arachno, closo, nido
C)
closo, nido, arachno
D)
nido, arachno, closo
Answer & Solution
Answer: Option
C
9
The order of acidity in boron trihalides is
A)
BF3 > BCl3 > BBr3
B)
BBr3 > BCl3 > BF3
C)
BF3 > BBr3 > BCl3
D)
BBr3 > BF3 > BCl3
Answer & Solution
Answer: Option
B
10
Among the following, the group of molecules that undergoes rapid hydrolysis is
A)
SF6 , Al2 Cl6 , SiMe4
B)
BCl3 , SF6 , SiCl4
C)
BCl3 , SiCl4 , PCl5
D)
SF6 , Al2 Cl6 , SiCl4
Answer & Solution
Answer: Option
C
