The pair of compounds that can exist together is:

1. FeCl3, SnCl2

2. HgCl, SnCl2

3. FeCl2, SnCl2

4. FeCl3, Kl

Subtopic:  d-Block Elements- Properties & Uses |
 52%
From NCERT
AIPMT - 2014
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In acidic medium, H2O2 changes Cr2O7–2 to CrO5 which has two (–O – O–) bonds.
The oxidation state of Cr in CrO5 is:

1. +5

2. +3

3. +6

4. -10

Subtopic:  Chemistry of Mn and Cr Compounds |
 74%
From NCERT
AIPMT - 2014
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Identify the correct order of solubility in aqueous medium:
1. ZnS > Na2S > CuS
2. Na2S > CuS > ZnS
3. Na2S > ZnS > Cus
4. Cus > ZnS > Na2S

Subtopic:  d-Block Elements- Properties & Uses |
AIPMT - 2013
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Considering the following reaction,
3 MnO 42– + 2 H 2 O ⇌ 2 MnO 4 + MnO 2 + 4 OH
The reagent that facilitates the removal of OH ions to ensure the completion of the conversion of K2MnO4 to KMnO4 is:

1. KOH
2. CO2
3. SO2
4. HCl
Subtopic:  Chemistry of Mn and Cr Compounds |
From NCERT
AIPMT - 2013
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Which of the following statements is false? 

1. On passing H2S through acidified K2Cr2O7 solution, a milky colour is observed.
2. Na2Cr2O7 is preferred over K2Cr2O7 in volumetric analysis.
3.  K2Cr2O7 solution in an acidic medium is orange.
4. K2Cr2O7 solution becomes yellow in increasing the pH beyond 7

Subtopic:  d-Block Elements- Properties & Uses |
 69%
From NCERT
AIPMT - 2012
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For the four successive transition elements (Cr, Mn, Fe and Co), the stability of +2 oxidation state will be there in which of the following order? 
(At. No Cr= 24, Mn= 25, Fe=26, Co= 27)

1.  Fe>Mn>Co>Cr

2.  Co>Mn>Fe>Cr

3.  Cr>Mn>Co>Fe

4.  Mn>Fe>Cr>Co

Subtopic:  d-Block Elements- Properties & Uses |
 65%
From NCERT
AIPMT - 2011
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Actinoids exhibit more number of oxidation states than lanthanoids. It is because of: 
1. The greater metallic character of the lanthanoids than that of the corresponding actinoids.
2. More energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals.
3. The lesser energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals.
4. More active nature of the actinoids.
Subtopic:  d-Block Elements- Properties & Uses | f-Block Elements- Properties & Uses | Lanthanoid & Actinoids Contraction |
 79%
From NCERT
AIPMT - 2011
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Acidified K2Cr2O7 solution turns green when Na2SO3 is added to it. This is due to the formation of:

1.  CrO42-

2.  Cr2SO33

3.  CrSO4

4.  Cr2SO43

Subtopic:  d-Block Elements- Properties & Uses |
 60%
From NCERT
AIPMT - 2011
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Which of the following ions will exhibit colour in aqueous solutions?

1. La3+ (Z=57)

2. Ti3+ (Z=22)

3. Lu3+ (Z=71)

4. Sc3+ (Z=21)

Subtopic:  Lanthanoid & Actinoids Contraction |
 80%
From NCERT
AIPMT - 2010
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Which one of the following ions has electronic configuration [Ar] 3d6
(At. no :Mn = 25, Fe= 26, Co= 27, Ni = 28)

1. Ni3+

2. Mn3+

3. Fe3+

4. Co3+

Subtopic:  d-Block Elements- Properties & Uses |
 80%
From NCERT
AIPMT - 2010
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