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NEET Practice Questions (MCQs) with Answers & Solutions

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Which of following is used in preparation of optical glass of camera having high refractive index ?

A. ceric compounds B. $CeO_2$ C. Oxides of lanthanoids D. Gadolinium sulphate

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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%

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Explanation

Pyrophoric misch metal is an alloy primarily composed of cerium (Ce) and lanthanum (La) with a smaller amount of iron (Fe) and other elements. The typical constitution is Ce-50%, La-40%, Fe-7%, and other elements making up the remaining 3%. This alloy is used in flints for lighters due to its ability to produce sparks when struck.

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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.

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Why do theoretical 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.

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Explanation

The theoretical value of the magnetic moment often differs from the practical value due to the rotation-orbital combination. This involves the interaction between the electron's spin and its orbital angular momentum, which can lead to deviations from the values predicted by simple spin-only calculations. These interactions are complex and can cause significant differences between theoretical and observed magnetic moments.

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What is the value of magnetic moment of central metal ion in $K_2MnO_4$ ?

A. 0.0 BM B. 1.73 BM C. 2.83 BB D. 3.87 BM

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Which of following pair of elements has $ (n-1)d^{10} ns^2 $ electronic configuration ?[Pb CET-1996]

A. Fe, Co, Ni B. Cu,Ag, Au C. Zn, Cd, Hg D. Sc, Y, La

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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.

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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]

A. V B. Cr C. Mn D. Fe

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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]

A. $ 1.40 A ^ \circ $ B. $ 1.40 A ^\circ $ C. $ 0.85 A ^ \circ $ D. $ 1.60 A ^\circ $

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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….

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How many d-electrons are their in $ Fe^{2+} $ (Z= 26) [AIEEE-2003]

A. 4 B. 5 C. 6 D. 3

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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)

A. $ K_2 MnO_4$ Dark green B. $ KMnO_4, Violet $ C. $ Mn_2O_3, Grey $ D. $ Mn_2O_4, Black $

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