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Free download in PDF Class 12 Chemistry Chapter 7 p Block Elements Multiple Choice Questions (MCQs) and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like NEET, AIIMS, JIPMER etc. These short solved questions or quizzes are provided by Gkseries./p>
(1)
In the presence of KF, AlF3 is soluble in HF. Find the complex formed
[A]
K3[AlF6]
[B]
AlH3
[C]
K[AlF3H]
[D]
K3[AlF3H3]
(2)
S-S bond is present in which of the ion pairs
[A]
S2O72-, S2O32-
[B]
S4O62-, S2O72-
[C]
S2O72-, S2O82-
[D]
S4O62-, S2O32-
(3)
Which is the correct order of decreasing bond dissociation enthalpy?
[A]
F2 > Cl2 > Br2 > I2
[B]
I2 > Br2 > Cl2 > F2
[C]
Cl2 > Br2 > F2 > I2
[D]
Br2 > I2 > F2 > Cl2
Answer: Br2 > I2 > F2 > Cl2
(4)
Oxygen is not released on heating which of the compounds?
[A]
(NH4)2Cr2O7
[B]
K2Cr2O7
[C]
Zn(ClO3)2
[D]
KClO3
(5)
Which of the species has a permanent dipole moment?
[A]
SF4
[B]
SiF4
[C]
BF3
[D]
XeF4
(6)
Which of the statement is incorrect for XeO4 ?
[A]
four pπ-dπ bonds are present
[B]
four sp3 β p π bonds are present
[C]
It has a tetrahedral shape
[D]
It has a square planar shape
Answer: It has a square planar shape
(7)
P4O10 has ______ bridging O atoms
(8)
Find the amphoteric oxide
[A]
CaO2
[B]
CO2
[C]
SnO2
[D]
SiO2
(9)
Graphite has a structural similarity with
[A]
B2H6
[B]
B4C
[C]
B
[D]
BN
(10)
Which is the correct order of decreasing acidity of lewis acids?
[A]
BBr3 > BCl3 > BF3
[B]
BF3 > BCl3 > BBr3
[C]
BCl3 > BF3 > BBr3
[D]
BBr3 > BF3 > BCl3
Answer: BBr3 > BCl3 > BF3
(11)
Boron form covalent Compound due to
[A]
Higher ionisation enthalpy
[B]
Lower ionisation enthalpy
[C]
Small size
[D]
Both (a) and (c)
(12)
In diborane the Two H-B-H angles are nearly
[A]
60° , 120°
[B]
95° ,120°
[C]
95° ,150°
[D]
120° ,180°
(13)
The stability of +1 oxidation state increases in the sequence
[A]
Al< Ga< In< Tl
[B]
Tl< In< Ga< Al
[C]
In< Tl< Ga< Al
[D]
Ga< In< Al< Tl
(14)
Which of the following is most acidic
[A]
Na2O
[B]
Mgo
[C]
Al2O3
[D]
Cao
(15)
Cohen Orthoboric acid (H3BO3) is strongly heated, the residue is
[A]
Meta boric acid
[B]
Boron
[C]
Al2O3, 2H2O
[D]
None of above
(16)
Bauxite has the composition
[A]
Al2O3
[B]
Al2O3, H2O
[C]
Al2O3 • 2H2O
[D]
All the given
(17)
Which one of the following is correct statement
[A]
The hydroxide of aluminium is more acidic than that of boron
[B]
The hydroxide of boron is basic, while that of aluminium is amphoteric
[C]
The hydroxide of boron is acidic, while that of aluminium is amphoteric
[D]
The hydroxide of boron & aluminium are amphoteric
Answer: The hydroxide of boron is acidic, while that of aluminium is amphoteric
(18)
AlCl3 is
[A]
Anhydrous & covalent
[B]
Anhydrous & ionic
[C]
Covalent & basic
[D]
Coordinate & acidic
Answer: Anhydrous & covalent
(19)
Aluminium (III) chloride forms a dimer because
[A]
Higher coordination number can be achieved by aluminium
[B]
Aluminium has high ionization energy
[C]
Aluminium belongs to III group
[D]
It cannot form a trimer
Answer: Higher coordination number can be achieved by aluminium
(20)
Aluminium has a great affinity for oxygen & itβs oxidation is an exothermic process. This fact is used in
[A]
Preparing thin foils of aluminium
[B]
Making utensils
[C]
Preparing duralumin alloy
[D]
Thermite welding
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