What is the value of magnetic moment of central metal ion in $K_2MnO_4$ ?
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Chemistry MCQs for NEET — Practice Questions with Answers
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Which of following pair of elements has $ (n-1)d^{10} ns^2 $ electronic configuration ?[Pb CET-1996]
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Explanation
The electronic configuration $ (n-1)d^{10} ns^2 $ is characteristic of the elements in the 12th group of the periodic table, which include Zn, Cd, and Hg. These elements have fully filled d-orbitals and two electrons in the outermost s-orbital.
The atomic no. of V, Cr, Mn and Fe are 23, 24, 25 & 26 respectively. Which of following has highest value of their second ionization enthalpy ? [AIEEE-2003]
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If the radius of $ La ^{3+} is 1.06 A ^\circ $ , than what will be the approximate value of radius of Lu3+ from the following ? [AIEEE-2003]
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Explanation
The ionic radius of Lu3+ is approximately 0.85 Ã…. As we move from La (Lanthanum) to Lu (Lutetium) in the lanthanide series, the ionic radius decreases due to the lanthanide contraction. Hence, the correct answer is 0.85 Ã….
How many d-electrons are their in $ Fe^{2+} $ (Z= 26) [AIEEE-2003]
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What will be obtained when managanese dioxide is fused with KOH in presence of oxidizing agent like $KNO_3$ ? What will be the colour of product ? (AIEEE-2003)
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Ce is an important member of Lanthenoid series which of following is wrong statement for Ce ? [AIEEE-2004]
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The canthanide contraction is responsible for the fact that………... [AIEEE-2005]
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Explanation
The lanthanide contraction refers to the steady decrease in the ionic radii of the lanthanide elements with increasing atomic number. This contraction causes elements following the lanthanides in the periodic table to have similar sizes. Consequently, Zr and Hf, which are not lanthanides but are affected by the lanthanide contraction, have similar covalent and ionic radii.
In which of following group, all ions have $3d^2$ configuration ?[PMT-2004] [Atomic No. Ti = 22,V = 23, Cr = 24, Mn = 25]
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The actinides exhibit more number of oxidation states in general than the lanthanide, because..........[AIEEE-2007, 2008, PMT-2005, 2006]
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Explanation
Actinides exhibit a greater number of oxidation states compared to lanthanides primarily because the energy difference between the 5f and 6d orbitals in actinides is less than the energy difference between the 4f and 5d orbitals in lanthanides. This smaller energy difference allows electrons to be more easily excited to higher oxidation states in actinides. As a result, actinides can exhibit a wider range of oxidation states.
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