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D and F Block Elements mcq. We covered all the D and F Block Elements mcq in this post for free so that you can practice well for the exam.
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mcq on D and F Block Elements for NEET Students
Identify the INCORRECT statement about interstitial compounds.
(A) These compounds are unreactive in nature.
(B) They lack a definite stoichiometry and are neither purely ionic nor covalent.
(C) Their melting points are lower than those of the original Metals.
(D) They possess significant hardness.
Option c – Their melting points are lower than those of the original Metals.
Which of the following statements about actinoids is INCORRECT?
(I) Every element in the actinoid group is radioactive.
(II) Actinoid elements can form oxocations.
(III) Their hydroxides show lower basicity than those of lanthanoids.
(IV) Actinoids belong to the 6th period of the Periodic Table.
(A) I and II
(B) III and IV
(C) I and III
(D) II and IV
Option b – III and IV
Which compound contains chromium in its highest oxidation state?
(A) CrF₅
(B) CrO₂
(C) Na₂CrO₄
(D) Cr(NO₃)₃
Option c – Na₂CrO₄
All the following statements are correct, EXCEPT:
(A) Early lanthanoids show reactivity similar to calcium.
(B) Lanthanoids form oxides with the general formula Ln₂O₃ when ignited in air.
(C) Lanthanoid mixed oxides serve as catalysts in petroleum refining.
(D) Water reacts with lanthanoids to produce oxygen gas.
Option d – Water reacts with lanthanoids to produce oxygen gas.
Which pair is mismatched regarding the nature of metal oxides?
(A) CrO : Basic
(B) V₂O₅ : Amphoteric
(C) Cr₂O₃ : Amphoteric
(D) V₂O₃ : Acidic
Option d – V₂O₃ : Acidic
Which of the following statements is false when H₂S is passed into acidified K₂Cr₂O₇?
(A) Sulphur precipitates as a pale yellow Solid.
(B) The solution becomes colorless.
(C) H₂S is oxidized in the reaction.
(D) Dichromate ions are reduced.
Option b – The solution becomes colorless.
What is true about the final four actinoid elements?
(A) They commonly exhibit high oxidation states.
(B) These elements are not radioactive.
(C) They typically show a +3 oxidation state in compounds.
(D) Their ground-state configurations include a fully filled 5f orbital.
Option c – They typically show a +3 oxidation state in compounds.
Determine the oxidation states of iron and chromium in chromite ore.
(A) +3 for iron, +2 for chromium
(B) +3 for iron, +6 for chromium
(C) +2 for iron, +6 for chromium
(D) +2 for iron, +3 for chromium
Option d – +2 for iron, +3 for chromium
How many s-electrons are present in an Atom of nickel (Z = 28)?
(A) 0
(B) 2
(C) 4
(D) 8
Option d – 8
In the titration of K₂Cr₂O₇ with acidified Fe²⁺ solution using diphenylamine, how many moles of Fe²⁺ react with one mole of dichromate?
(A) 3
(B) 4
(C) 5
(D) 6
Option d – 6
How many moles of KMnO₄ are needed to oxidize one mole of sulphite ion to sulphate in acidic medium?
(A) 2/5
(B) 5
(C) 4/5
(D) 2
Option a – 2/5
Choose the INCORRECT statement about dichromates.
(A) K₂Cr₂O₇ is suitable as a primary standard in titrations.
(B) Na₂Cr₂O₇ is less soluble in water than K₂Cr₂O₇.
(C) K₂Cr₂O₇ finds use in leather tanning.
(D) Acidified K₂Cr₂O₇ can oxidize Sn²⁺ to Sn⁴⁺.
Option b – Na₂Cr₂O₇ is less soluble in water than K₂Cr₂O₇.
Assertion: Mn²⁺ is more stable than Mn³⁺, but Fe³⁺ is more stable than Fe²⁺.
Reason: Mn²⁺ and Fe³⁺ both have half-filled d orbitals.
(A) Both Assertion and Reason are true, and Reason correctly explains Assertion.
(B) Both Assertion and Reason are true, but Reason does not explain Assertion.
(C) Assertion is true, but Reason is false.
(D) Assertion is false, but Reason is true.
Option a – Both Assertion and Reason are true, and Reason correctly explains Assertion.
Choose the correct SET of characteristics for manganate and permanganate ions.
Properties:
(I) Paramagnetic
(II) Diamagnetic
(III) Tetrahedral shape
(IV) Trigonal pyramidal shape
(V) Green color
(VI) Purple color
(A) Manganate: I, III, V; Permanganate: II, III, VI
(B) Manganate: II, IV, V; Permanganate: I, III, VI
(C) Manganate: I, IV, VI; Permanganate: II, III, V
(D) Manganate: I, III, VI; Permanganate: II, III, VI
Option a – Manganate: I, III, V; Permanganate: II, III, VI
What is the Molecular formula for the product formed when lanthanoids react with nitrogen?
(A) Ln₂N₃
(B) LnN₂
(C) Ln₃N
(D) LnN
Option d – LnN
Which of the following is true for the dichromate ion?
(A) No Cr–Cr or O–O bonds exist.
(B) One Cr–Cr bond and six O–O bonds are present.
(C) Cr–Cr bond is absent, but six O–O bonds are present.
(D) There is one Cr–Cr bond and seven Cr–O bonds.
Option a – No Cr–Cr or O–O bonds exist.
When chromite ore is fused with Na₂CO₃ in air and extracted, followed by Acid treatment, which compounds are formed as (B) and (D) respectively?
(A) Na₂Cr₂O₇, K₂CrO₄
(B) Na₂CrO₄, K₂Cr₂O₇
(C) FeCr₂O₄, K₂CrO₄
(D) Na₂SO₄, K₂Cr₂O₇
Option b – Na₂CrO₄, K₂Cr₂O₇
Given atomic numbers: 29, 59, 68, 74, 89, 96, 102, 104. How many of these are inner transition elements?
(A) 2
(B) 3
(C) 4
(D) 5
Option c – 4
Which of the following elements has the lowest third ionization energy?
(A) Zinc
(B) Manganese
(C) Scandium
(D) Chromium
Option c – Scandium
A reaction occurs: X + dilute H₂SO₄ → Y (a colorless, suffocating gas) Y + K₂Cr₂O₇ + H₂SO₄ → green solution
Identify X and Y.
(A) Na₂SO₃, SO₂
(B) NaCl, HCl
(C) Na₂S, H₂S
(D) Na₂CO₃, CO₂
Option a – Na₂SO₃, SO₂
Among 5d series elements, which one has the highest melting point?
(A) Hafnium
(B) Platinum
(C) Osmium
(D) Tungsten
Option d – Tungsten
Which of these does NOT have a completely filled d-subshell?
(A) Nickel
(B) Zinc
(C) Cadmium
(D) Silver
Option a – Nickel
How many moles of KMnO₄ are needed in an acidic solution to oxidize 10 moles of sulphide ions?
(A) 2
(B) 3
(C) 4
(D) 5
Option c – 4
What is the product when MnO₂ (pyrolusite) is heated with KOH and air?
(A) K₂MnO₄
(B) MnO
(C) KMnO₄
(D) Mn₂O₇
Option a – K₂MnO₄
Among Gd, Lu, Eu, Yb, and Tb, how many elements have more than 8 electrons in the 4f subshell? (Atomic numbers: Ce=58, Eu=63, Gd=64, Tb=65, Lu=71, Yb=70)
(A) 2
(B) 3
(C) 4
(D) 5
Option b – 3
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