Magnetic moment 2.84 BM is given by (At. no. Ni = 28, Ti = 22, Cr = 24, Co = 27)

1. Ni2+
2. Ti3+
3. Cr3+
4. Co2+

Subtopic:  d-Block Elements- Properties & Uses |
 76%
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NEET - 2015

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KMnO4 can be prepared from K2MnO4 as per the reaction: 
3MnO42-+2H2O2MnO4-+MnO2+4OH-
The reaction can go to completion by removing OH ions by adding:
1. KOH
2. CO2
3. SO2
4. HCl

 

Subtopic:  Chemistry of Mn and Cr Compounds |
 53%
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AIPMT - 2013

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Identify the alloy containing a non-metal as a constituent in it.

1. Invar

2. Steel

3. Bell metal

4. Bronze

Subtopic:  d-Block Elements- Properties & Uses |
 59%
From NCERT
AIPMT - 2012

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For the four successive transition elements (Cr, Mn, Fe and Co), the correct order of stability of +2 oxidation state among the following is: 
(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 |
 74%
From NCERT
AIPMT - 2011

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The acidified \(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7\) solution turns green when \(\mathrm{Na}_2 \mathrm{SO}_3\) is added to it. This is due to the formation of:

1. \(\mathrm{CrO}_4^{2-} \) 2. \(\mathrm{Cr}_2 \mathrm({SO}_3)_3 \)
3. \(\mathrm{CrSO}_4 \) 4. \(\mathrm{Cr}_2 \mathrm({SO}_4)_3\)
Subtopic:  d-Block Elements- Properties & Uses |
 55%
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AIPMT - 2011

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A colored ion in aqueous solutions among the following is:

1. La3+ (Z=57)

2. Ti3+ (Z=22)

3. Lu3+ (Z=71)

4. Sc3+ (Z=21)

Subtopic:  Lanthanoid & Actinoids Contraction |
 88%
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AIPMT - 2010

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The species that are colourless:

(Z of Ti = 22, Co=27, Cu = 29, Ni= 28)

1. TiF62- and CoF63-

2. Cu2Cl2 and NiCl42-

3. TiF62- and Cu2Cl2

4. CoF63- and NiCl42-

Subtopic:  Introduction, Classification and Nomenclature |
 73%
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AIPMT - 2009

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The correct order of decreasing second ionization enthalpy of Ti(22), V(23), Cr (24) and Mn(25) is

1.  Cr > Mn > V > Ti

2.  V > Mn > Cr > Ti

3.  Mn > Cr > Ti > V

4.  Ti > V > Cr > Mn

Subtopic:  Ionization Energy (IE) |
 58%
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AIPMT - 2008

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The incorrect statement among the following is:  

1. There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu.
2. Lanthanoid contraction is the accumulation of successive shrinkages.
3. As a result of lanthanoid contraction, the properties of the 4d series of the transition elements have no similarities with the 5d series of elements.
4. The shielding power of 4f electrons is quite weak.

Subtopic:  Lanthanoid & Actinoids Contraction |
 85%
From NCERT
AIPMT - 2007

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Which one of the following ions is the most stable in aqueous solution? 
(At. No. Ti = 22, V = 23, Cr = 24, Mn = 25)

1. Cr3+

2. V3+

3. Ti3+

4. Mn3+

Subtopic:  Electronic Configuration |
 56%
From NCERT
AIPMT - 2007

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