Multiple Choice Questions (MCQs) for JEE Chemistry: The D and F Block Elements
Review structured MCQ sets for JEE Chemistry The D and F Block Elements. Built according to official JEE guidelines, these downloadable questions support daily revision and core concept reinforcement.
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Multiple Choice Questions
(a) \( \ce{TiCl3} \)
(b) \( \ce{VCl3} \)
(c) \( \ce{ScCl3} \)
(d) \( \ce{FeCl3} \)
Show Answer & Explanation
Answer: (c) \( \ce{ScCl3} \)
Explanation:
1. A diamagnetic substance is slightly repelled and appears lighter.
2. \( \ce{Sc^{3+}} \) is 3d0 (diamagnetic) while V(III), Ti(III) and Fe(III) have unpaired electrons.
Teacher's Note:
1. Write the electronic configuration of the species first; most d-block questions follow from it.
2. Compare options using trends (oxidation states, size, magnetism) rather than memorising isolated facts.
(a) \( \ce{CrO(O2)} \)
(b) \( \ce{Cr2O3} \)
(c) \( \ce{CrO3} \)
(d) \( \ce{Cr} \)
Show Answer & Explanation
Answer: (b) \( \ce{Cr2O3} \)
Explanation:
1. \( \ce{(NH4)2Cr2O7 -> N2 + Cr2O3 + 4H2O} \).
2. Chromium(III) oxide is green.
Teacher's Note:
1. Write the electronic configuration of the species first; most d-block questions follow from it.
2. Compare options using trends (oxidation states, size, magnetism) rather than memorising isolated facts.
(a) copper
(b) zinc
(c) silver
(d) nickel
Show Answer & Explanation
Answer: (a) copper
Explanation:
1. Copper forms the green coating \( \ce{CuCO3.Cu(OH)2} \) on exposure to moist air.
Teacher's Note:
1. Write the electronic configuration of the species first; most d-block questions follow from it.
2. Compare options using trends (oxidation states, size, magnetism) rather than memorising isolated facts.
(a) \( \ce{Fe} \)
(b) \( \ce{Zn} \)
(c) \( \ce{Cu} \)
(d) \( \ce{Hg} \)
Show Answer & Explanation
Answer: (c) \( \ce{Cu} \)
Explanation:
1. Malachite is basic copper carbonate, \( \ce{CuCO3.Cu(OH)2} \).
Teacher's Note:
1. Write the electronic configuration of the species first; most d-block questions follow from it.
2. Compare options using trends (oxidation states, size, magnetism) rather than memorising isolated facts.
(a) \( \ce{AgBr} \)
(b) \( \ce{Ag2O} \)
(c) \( \ce{AgI} \)
(d) \( \ce{AgCl} \)
Show Answer & Explanation
Answer: (a) \( \ce{AgBr} \)
Explanation:
1. Silver bromide is the light-sensitive compound of photographic emulsions.
Teacher's Note:
1. Write the electronic configuration of the species first; most d-block questions follow from it.
2. Compare options using trends (oxidation states, size, magnetism) rather than memorising isolated facts.
(a) passing \( \ce{CO2} \)
(b) boiling with \( \ce{CaCO3} \)
(c) adding \( \ce{NaHCO3} \)
(d) adding \( \ce{Na2CO3} \)
Show Answer & Explanation
Answer: (c) adding \( \ce{NaHCO3} \)
Explanation:
1. Sodium carbonate gives basic zinc carbonate because of hydrolysis of carbonate.
2. The less basic bicarbonate gives the normal carbonate \( \ce{ZnCO3} \).
Teacher's Note:
1. Write the electronic configuration of the species first; most d-block questions follow from it.
2. Compare options using trends (oxidation states, size, magnetism) rather than memorising isolated facts.
(a) \( \ce{FeSO4.5H2O} \)
(b) \( \ce{FeSO4.6H2O} \)
(c) \( \ce{CuSO4.5H2O} \)
(d) \( \ce{MnSO4.4H2O} \)
Show Answer & Explanation
Answer: (c) \( \ce{CuSO4.5H2O} \)
Explanation:
1. Unpaired electrons: \( \ce{Mn^{2+}} \) 5, \( \ce{Cu^{2+}} \) 1, \( \ce{Fe^{2+}} \) 4.
2. The copper salt has the lowest magnetism.
Teacher's Note:
1. Write the electronic configuration of the species first; most d-block questions follow from it.
2. Compare options using trends (oxidation states, size, magnetism) rather than memorising isolated facts.
(a) \( \ce{CrO3, Mn2O7} \)
(b) \( \ce{CaO, ZnO} \)
(c) \( \ce{ZnO, Al2O3} \)
(d) \( \ce{Na2O, Al2O3} \)
Show Answer & Explanation
Answer: (a) \( \ce{CrO3, Mn2O7} \)
Explanation:
1. \( \ce{CrO3} \) and \( \ce{Mn2O7} \) are oxides of metals in their highest oxidation states and are acidic.
2. \( \ce{ZnO} \) and \( \ce{Al2O3} \) are amphoteric; \( \ce{CaO} \) and \( \ce{Na2O} \) are basic.
Teacher's Note:
1. Write the electronic configuration of the species first; most d-block questions follow from it.
2. Compare options using trends (oxidation states, size, magnetism) rather than memorising isolated facts.
(a) Heating to a high temperature and then cooling suddenly, e.g. by dipping in water, makes steel hard and brittle
(b) Steel can be softened by heating it to a high temperature for a prolonged time and then cooling slowly. This is called quenching
(c) Tempering of hardened steel is done by heating it to just below red heat at controlled temperature and duration
(d) Phosphorus impurity makes steel 'cold short'
Show Answer & Explanation
Answer: (b) Steel can be softened by heating it to a high temperature for a prolonged time and then cooling slowly. This is called quenching
Explanation:
1. Slow cooling to soften steel is annealing, not quenching.
2. The other three statements are correct.
Teacher's Note:
1. Write the electronic configuration of the species first; most d-block questions follow from it.
2. Compare options using trends (oxidation states, size, magnetism) rather than memorising isolated facts.
(a) two
(b) one
(c) one fifth
(d) five
Show Answer & Explanation
Answer: (a) two
Explanation:
1. \( \ce{2MnO4^- + I^- + H2O -> 2MnO2 + IO3^- + 2OH^-} \).
2. Mn changes by 3 per Mn (+7 to +4); iodide to iodate loses 6 electrons, so 2 mol of permanganate are reduced.
Teacher's Note:
1. Write the electronic configuration of the species first; most d-block questions follow from it.
2. Compare options using trends (oxidation states, size, magnetism) rather than memorising isolated facts.
(a) 0%
(b) 1%
(c) 5%
(d) none of these
Show Answer & Explanation
Answer: (a) 0%
Explanation:
1. German silver is an alloy of Cu, Zn and Ni and contains no silver.
Teacher's Note:
1. Write the electronic configuration of the species first; most d-block questions follow from it.
2. Compare options using trends (oxidation states, size, magnetism) rather than memorising isolated facts.
(a) \( \ce{Cu} \) and dilute \( \ce{HNO3} \)
(b) \( \ce{Cu} \) and \( \ce{N2O} \)
(c) \( \ce{C} \) and \( \ce{N2O} \)
(d) \( \ce{Na} \) and \( \ce{NH3} \)
Show Answer & Explanation
Answer: (a) \( \ce{Cu} \) and dilute \( \ce{HNO3} \)
Explanation:
1. \( \ce{3Cu + 8HNO3(dil) -> 3Cu(NO3)2 + 2NO + 4H2O} \).
Teacher's Note:
1. Write the electronic configuration of the species first; most d-block questions follow from it.
2. Compare options using trends (oxidation states, size, magnetism) rather than memorising isolated facts.
(a) \( \ce{Ba + ZnO2} \)
(b) \( \ce{BaO2 + Zn} \)
(c) \( \ce{BaZnO2} \)
(d) \( \ce{BaCdO2} \)
Show Answer & Explanation
Answer: (c) \( \ce{BaZnO2} \)
Explanation:
1. Amphoteric ZnO acts as an acid oxide towards basic BaO: \( \ce{ZnO + BaO -> BaZnO2} \), barium zincate.
Teacher's Note:
1. Write the electronic configuration of the species first; most d-block questions follow from it.
2. Compare options using trends (oxidation states, size, magnetism) rather than memorising isolated facts.
(a) Poling
(b) Cupellation
(c) Electrolytic refining
(d) Van-Arkel process
Show Answer & Explanation
Answer: (d) Van-Arkel process
Explanation:
1. Forming a volatile iodide and decomposing it on a hot filament is the Van-Arkel method (used for Ti, Zr).
Teacher's Note:
1. Write the electronic configuration of the species first; most d-block questions follow from it.
2. Compare options using trends (oxidation states, size, magnetism) rather than memorising isolated facts.
(a) lead
(b) zinc
(c) aluminium
(d) iron
Show Answer & Explanation
Answer: (a) lead
Explanation:
1. Lead is dense and absorbs X-rays and gamma rays effectively.
Teacher's Note:
1. Write the electronic configuration of the species first; most d-block questions follow from it.
2. Compare options using trends (oxidation states, size, magnetism) rather than memorising isolated facts.
(a) are soluble in \( \ce{NH4OH} \)
(b) are soluble in hypo
(c) are soluble in acids
(d) are photosensitive
Show Answer & Explanation
Answer: (d) are photosensitive
Explanation:
1. Silver halides decompose to silver on exposure to light, which creates the latent image.
Teacher's Note:
1. Write the electronic configuration of the species first; most d-block questions follow from it.
2. Compare options using trends (oxidation states, size, magnetism) rather than memorising isolated facts.
(a) annealing
(b) sheradizing
(c) case hardening
(d) tempering
Show Answer & Explanation
Answer: (c) case hardening
Explanation:
1. Heating iron in contact with carbon forms a hard, carbon-rich surface layer: case hardening.
Teacher's Note:
1. Write the electronic configuration of the species first; most d-block questions follow from it.
2. Compare options using trends (oxidation states, size, magnetism) rather than memorising isolated facts.
(a) \( \ce{Ag2CO3} \)
(b) \( \ce{Ag2O} \)
(c) \( \ce{NaAgCO3} \)
(d) \( \ce{Ag} \)
Show Answer & Explanation
Answer: (d) \( \ce{Ag} \)
Explanation:
1. \( \ce{2AgCl + Na2CO3 -> Ag2CO3 + 2NaCl} \), and \( \ce{Ag2CO3} \) decomposes on heating to Ag, \( \ce{CO2} \) and \( \ce{O2} \).
2. The final product is metallic silver.
Teacher's Note:
1. Write the electronic configuration of the species first; most d-block questions follow from it.
2. Compare options using trends (oxidation states, size, magnetism) rather than memorising isolated facts.
(a) Wrought iron
(b) Steel
(c) Cast iron
(d) Mild steel
Show Answer & Explanation
Answer: (c) Cast iron
Explanation:
1. Cast iron contains about 2.5 to 4.5 percent carbon, steel 0.1 to 1.5 percent and wrought iron only about 0.2 percent.
Teacher's Note:
1. Write the electronic configuration of the species first; most d-block questions follow from it.
2. Compare options using trends (oxidation states, size, magnetism) rather than memorising isolated facts.
(a) \( \ce{AgCl} \)
(b) \( \ce{AgBr} \)
(c) \( \ce{AgI} \)
(d) all are equally soluble
Show Answer & Explanation
Answer: (a) \( \ce{AgCl} \)
Explanation:
1. AgCl dissolves readily in dilute ammonia as \( \ce{[Ag(NH3)2]Cl} \).
2. The solubility product falls AgCl > AgBr > AgI, so AgBr dissolves only in conc. ammonia and AgI does not.
Teacher's Note:
1. Write the electronic configuration of the species first; most d-block questions follow from it.
2. Compare options using trends (oxidation states, size, magnetism) rather than memorising isolated facts.
(a) \( \ce{Fe2O3.xH2O} \)
(b) \( \ce{FeO} \)
(c) \( \ce{FeO.H2O} \)
(d) \( \ce{Fe3O4} \)
Show Answer & Explanation
Answer: (a) \( \ce{Fe2O3.xH2O} \)
Explanation:
1. Rust is hydrated ferric oxide, \( \ce{Fe2O3.xH2O} \).
Teacher's Note:
1. Write the electronic configuration of the species first; most d-block questions follow from it.
2. Compare options using trends (oxidation states, size, magnetism) rather than memorising isolated facts.
(a) \( \ce{Zn} \)
(b) \( \ce{Ca} \)
(c) \( \ce{Cu} \)
(d) \( \ce{Fe} \)
Show Answer & Explanation
Answer: (a) \( \ce{Zn} \)
Explanation:
1. ZnO is amphoteric; CaO, FeO and CuO are basic.
Teacher's Note:
1. Write the electronic configuration of the species first; most d-block questions follow from it.
2. Compare options using trends (oxidation states, size, magnetism) rather than memorising isolated facts.
(a) becomes liquid
(b) becomes soft
(c) becomes hard and brittle
(d) is covered with a thin film of \( \ce{Fe3O4} \)
Show Answer & Explanation
Answer: (b) becomes soft
Explanation:
1. Annealing is slow cooling after heating; it removes internal stress and makes steel soft and ductile.
2. Sudden cooling (quenching) makes it hard and brittle.
Teacher's Note:
1. Write the electronic configuration of the species first; most d-block questions follow from it.
2. Compare options using trends (oxidation states, size, magnetism) rather than memorising isolated facts.
(a) \( [MnCl_4]^{2-} > [Fe(CN)_6]^{4-} > [CoCl_4]^{2-} \)
(b) \( [Fe(CN)_6]^{4-} > [CoCl_4]^{2-} > [MnCl_4]^{2-} \)
(c) \( [Fe(CN)_6]^{4-} > [MnCl_4]^{2-} > [CoCl_4]^{2-} \)
(d) \( [MnCl_4]^{2-} > [CoCl_4]^{2-} > [Fe(CN)_6]^{4-} \)
Show Answer & Explanation
Answer: (d) \( [MnCl_4]^{2-} > [CoCl_4]^{2-} > [Fe(CN)_6]^{4-} \)
Explanation:
1. \( \ce{[Fe(CN)6]^{4-}} \): Fe(II), 3d6, strong-field CN gives low spin, 0 unpaired electrons.
2. \( \ce{[MnCl4]^{2-}} \): Mn(II), 3d5, tetrahedral weak field, 5 unpaired electrons.
3. \( \ce{[CoCl4]^{2-}} \): Co(II), 3d7, tetrahedral, 3 unpaired electrons.
4. Order of moments: 5.92 > 3.87 > 0 B.M.
Teacher's Note:
1. Write the electronic configuration of the species first; most d-block questions follow from it.
2. Compare options using trends (oxidation states, size, magnetism) rather than memorising isolated facts.
(a) \( \ce{PbS} \)
(b) \( \ce{CuS} \)
(c) \( \ce{HgS} \)
(d) \( \ce{CdS} \)
Show Answer & Explanation
Answer: (c) \( \ce{HgS} \)
Explanation:
1. CuS, PbS and CdS are oxidised and dissolved by hot dilute nitric acid.
2. HgS is extremely insoluble and dissolves only in aqua regia.
Teacher's Note:
1. Write the electronic configuration of the species first; most d-block questions follow from it.
2. Compare options using trends (oxidation states, size, magnetism) rather than memorising isolated facts.
(a) Monel metal: Cu + Zn + Sn
(b) German silver: Cu + Zn + Ni
(c) Alnico: Fe + Al + Ni + Co
(d) Duralumin: Al + Cu + Mg + Mn
Show Answer & Explanation
Answer: (a) Monel metal: Cu + Zn + Sn
Explanation:
1. Monel metal is a nickel-copper alloy (Ni about 67, Cu about 30), not Cu-Zn-Sn.
Teacher's Note:
1. Write the electronic configuration of the species first; most d-block questions follow from it.
2. Compare options using trends (oxidation states, size, magnetism) rather than memorising isolated facts.
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Review structured objective questions for JEE Chemistry The D and F Block Elements. Built according to official JEE guidelines, these MCQ sets support daily revision and core concept reinforcement.
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FAQs
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