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Free download in PDF Class 12 Chemistry Chapter 8 the d and f Block Elements Objective Type Questions 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)
Which of general symbol is used to represent Lanthanoides ?
[A]
Ln
[B]
La
[C]
Le
[D]
Li
(2)
Which of following elements are include in actinide ?
[A]
Th to Lr
[B]
Ac to Lr
[C]
Ac to No
[D]
Th to No
(3)
Which of following radioactive elements in Lanthanodies.
[A]
Promethium (Pm)
[B]
Lutetium (Lu)
[C]
Yetterbium (Yb)
[D]
Samarium (Sm)
(4)
Which of following is used in gas lighters ?
[A]
CeO2
[B]
Pyrophoric Misch metal
[C]
Gadolinium sulphate
[D]
Ceric compounds
Answer: Pyrophoric Misch metal
(5)
Which of following is used as oxidizing agent in volumetric analysis ?
[A]
Ceric compounds
[B]
CeO2
[C]
Oxides of lanthanoids
[D]
Gadolinium sulphate
(6)
Which of following is used in preparation of optical glass of camera having high refractive index ?
[A]
ceric compounds
[B]
CeO2
[C]
Oxides of lanthanoids
[D]
Gadolinium sulphate
Answer: Oxides of lanthanoids
(7)
Which of following is used to produce very low temperature by magnetic field ?
[A]
Pyrophoric misch metal
[B]
Uranium
[C]
Thorium
[D]
Gadolinium sulphate
Answer: Gadolinium sulphate
(8)
What is the constitution of metals in pyrophoric misch metal ?
[A]
ce-50%, ca-40%, Fe-10%
[B]
Ce-50%, La-40%, Fe-7%, other-5%
[C]
Ce-40%, La-50%, Fe-5%, other-5%
[D]
Ce-40%, La-50%, Fe-10%
Answer: Ce-50%, La-40%, Fe-7%, other-5%
(9)
Which of following statement is wrong ?
[A]
Atoms of all transition elements are paramagnetic
[B]
All transition elements are metals
[C]
All elements of d-block are transition elements
[D]
D-block elements are present in between s & p block elements in periodic table
Answer: Atoms of all transition elements are paramagnetic
(10)
Why do theoritical value of magnetic moment differ from their practical value ?
[A]
Due to decrease in volume of metal ion
[B]
Due to unsymmetrical arrangement of dipoles in orbital
[C]
Due to rotation-orbital combination
[D]
Both are different methods to calculate magnetic moment
Answer: Due to rotation-orbital combination
(11)
What is the value of magnetic moment of central metal ion in K2MnO4 ?
[A]
0.0 BM
[B]
1.73 BM
[C]
2.83 BB
[D]
3.87 BM
(12)
What will be obtained when managanese dioxide is fused with KOH in presence of oxidizing agent like KNO3 ? What will be the colour of product ?
[A]
K2 MnO4 Dark green
[B]
KMnO4, Violet
[C]
Mn2O3, Grey
[D]
Mn2O4, Black
Answer: K2 MnO4 Dark green
(13)
Which of following group of transition metal is used to prepare currency coins ?
[A]
Cu, Ag, Au
[B]
Ru, Rh, Pd
[C]
Fe, Co, Ni
[D]
Os, Ir, Pt
(14)
Ce is an important member of Lanthenoid series which of following is wrong statement for Ce ?
[A]
The general oxidation state of Ce is +3 and +4
[B]
+3 oxidation state of Ce is more stable than +4
[C]
+4 oxidation state of Ce is not available in its aqueous solution
[D]
Ce (IV) behave as oxidizing agent
Answer: The general oxidation state of Ce is +3 and +4
(15)
Lanthanide contraction is caused due to ____
[A]
The appreciable shilding on outer electrons by 4f electrons from the nuclear charge
[B]
The appreciable shilding on outer electrons by 5d electrons from the nuclear charge
[C]
The same effective nuclear charge from Ce to Lu
[D]
The poor shilding on outer electrons by 4f electrons from the nucluear charge
Answer: The poor shilding on outer electrons by 4f electrons from the nucluear charge
(16)
The actinides exhibit more number of oxidation states in general than the lanthanide, because ____
[A]
The 5f-orbitals are more spread in place than the 4f orbitals
[B]
Energy differnce between 5f and 6d orbitals is less than that of 4f and 5d orbitals
[C]
Energy difference between 5f and 6d orbital is more than that of 4f and 5d orbitals
[D]
Actinides are more reactive than that of lanthanides
Answer: Energy differnce between 5f and 6d orbitals is less than that of 4f and 5d orbitals
(17)
The general oxidation state of Lanthanide elements is +3. Which of following is incorrect statement for them ?
[A]
Ln (III) hydroxides are mainly basic in character
[B]
Because of the large size of the Ln (III) ions, the bonding in its compounds is ionic in character
[C]
Ln (III) Compounds are generally colourless
[D]
The ionic sizes of Ln (III) decreases with increase in atomic number
Answer: Because of the large size of the Ln (III) ions, the bonding in its compounds is ionic in character
(18)
Which of following statement is wrong for transition element ?
[A]
Once the d5 configuration nis exceeded the tendency to involve all the 3d electrons in bonding decreases
[B]
In addition to the normal oxidation states, the zero oxidation state is also shown by these elements in complexes
[C]
In the highest oxidation states, the transition metals show basic
[D]
In the highest oxidation states of the first five (transition elements (Sc to Mn) all the 4s & 3d electrons are used for bonding
Answer: In the highest oxidation states, the transition metals show basic
(19)
Which of following is wrong statement ?
[A]
La (OH)3 is less basic than Lu(OH)3
[B]
In lanthanide series, ionic radius decreases while moving Ce3+ to Lu3+ ion
[C]
La is actually tranusition element
[D]
Due to Lanthanide contraction atomic radius of Zn and Hf are same
Answer: La (OH)3 is less basic than Lu(OH)3
(20)
What is oxidation no. of Cr in K2 Cr2 O7
[A]
+2
[B]
+4
[C]
+6
[D]
+7
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