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NEET NEET Questions — Free MCQ Practice

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When d⁸ arrangement in nickel ion changes from a weak octahedral field in $[N i (H_{2} O)_{6}]^{2 \oplus}$ to a strong field in $[N i (C N)_{4}]^{2 ⊝}$ , which orbitals get lowered in energy? Assume tetragonal distortion along the Z-axis.

A.

$d_{x^{2} - y^{2}}$

B.

$d_{z^{2}}$

C.

$d_{x y}, d_{z^{2}}$

D.

$d_{x z}, d_{y z}, d_{z^{2}}$

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Explanation

In a tetragonal distortion , the ligands along the z-axis move away. Their repulsion significantly decreases for the orbitals involving z-direction.These are lowered in energy.

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Assertion:Transition metals have high boiling points and high enthalpy of atomization.

Reason: The transition metals occur in bcc, hcp or ccp structures charcterstics of metals.

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion C. If the assertion is true but the reason is false D. If both the assertion and reason are false

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Explanation

Strong metallic bonding in transition metals is responsible for their high boiling points and high enthalpy of atomization.

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Assertion: Zn, Cd and Hg are normally not considered transition metals.

Reason: d-orbitals in above elements are completely filled, hence above metals do not show the general charcterstic properties of the transition elements.

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion C. If the assertion is true but the reason is false D. If both the assertion and reason are false

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Explanation

Zn, Cd and Hg are normally not considered transition metals because d-orbitals are completely filled, hence they do not show the general characterstic properties of the transition elements.Therefore, Zn, Cd and Hg are normally not considered tramnsition metals.

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Assertion :A transition metal forms alloy with other transition metal easily.

Reason: The transition metals have similar electronic configuration,nearly equal radii and exhibit similar packing in their lattices.

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion C. If the assertion is true but the reason is false D. If both the assertion and reason are false

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Explanation

The transition metals have similar electronic configuration,nearly equal radii and exhibit similar packing in their lattices hence these metals dissolve in each other easily even in the solid state, i.e. one metal can be easily substituted by another. it is because of this reason that the transition metals form alloys with each other easily.

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Assertion : Anhydrous copper(II) chloride is a covalent while anhydrous copper(II)fluoride is ionic in nature.

Reason: In halides of transition metals, the ionic character decreases with increase in atomic mass of the halogen.

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion C. If the assertion is true but the reason is false D. If both the assertion and reason are false

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Explanation

Anhydrous copper(II) chloride is a covalent while anhydrous copper(II)fluoride is ionic in nature because in halides of transition metals, the ionic character decreases with increase in atomic mass of the halogen. Fluorine being the most electronegative, forms ionic salt with copper.

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Assertion: Transition metals exhibits higher enthalpies of atomization.

Reason : The atoms of transiton metals are held together by strong metallic bonds.

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion C. If the assertion is true but the reason is false D. If both the assertion and reason are false

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Explanation

Transition metals exhibits higher enthalpies of atomization because the atoms of transition metals are held together by strong metallic bonds.

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Assertion : The transition elements form interstitial compounds.

Reason: Steel and cast iron are hard due to the formation of an interstitial compound with carbon.

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion C. If the assertion is true but the reason is false D. If both the assertion and reason are false

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Explanation

The transition elements form interstitial compounds in which small atoms of light elements such as H,C and N occupy the voids in their lattices.

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Fe₂(CO)₉ is diamagnetic.Which of the following reasons is correct?

A.

Presence of one CO as bridge group

B.

Presence of monodentate ligand

C.

Metal-metal(Fe-Fe) bond in molecule

D.

Resonance hybridization of CO

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Explanation

Fe2(CO)9 is diamagnetic due to the presence of a metal-metal (Fe-Fe) bond. In this compound, each iron atom contributes 9 electrons, and the remaining 2 electrons form the metal-metal bond, resulting in a total of 18 electrons shared between the two iron atoms, making it diamagnetic.

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From the stability constant (hypothetical values)given below, predict which is the strongest ligand?

A.

Cu²⁺+4NH₃ $⇌$ [Cu(NH₃)₄]²⁺;(k=4.5x10¹¹)

B.

Cu²⁺+4CN $⇌$ [Cu(CN)₄]^2-;(K=2.0x10²⁷)

C.

Cu²⁺+2en $⇌$ [Cu(en)₂]²⁺;(K=3.0x10¹⁵)

D.

Cu²⁺+4H₂O $⇌$ [Cu(H₂O)₄]²⁺;(K=9.5x10⁸)

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Explanation

(b) Higher is the stability constant of ligand, lesser is its dissociation,more is its stability

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Which does not obey EAN rule?

A.

[Cu(NH₃)₄]²⁺

B.

[Zn(OH)₄]^2-

C.

[HgI₄]^2-

D.

Fe(CO)₅

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Explanation

(a) The EAN for Cu in [Cu(NH₃)₄]²⁺ is 35 and not 36, the next inert gas at. no.

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