d- and f-Block Elements PYQs Set 1 (PDF)

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Mere Teacher · Previous Year Questions NEET Chemistry · d- and f-Block Elements · Set 1 (Q1-30)
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1. $Which of the following group of transition metals is called coinage metals?$ (1) $Cu, Ag, Au$ (2) $Ru, Rh, Pb$ (3) $Fe, Co, Ni$ (4) $Os. Ir, Pt$ 2. $A transition metal ion exists in its highest oxidation state. It is expected to behave as$ (1) $a chelating agent$ (2) $a central metal in a coordination compound$ (3) $an oxidising agent$ (4) $a reducing agent.$ 3. $Identify the incorrect statement from the following:$ (1) $Lanthanoids reveal only +3 oxidation state.$ (2) $The lanthanoid ions other than the f^{0} type and the f^{14} type are all paramagnetic.$ (3) $The overall decreases in atomic and ionic radii from lanthanum to lutetium is called lanthanoid contraction.$ (4) $Zirconium and Hafnium have identical radii of 160 pm and 159 pm , respectively as a consequence of lanthanoid contraction.$ 4. $The radius of La3+ (Atomic number of La = 57) is 1.06Å. Which one of the following given values will be closest to the radius of Lu3+ (Atomic number of Lu = 71) ?$ (1) $1.60Å$ (2) $1.40Å$ (3) $1.06Å$ (4) $0.85Å$ 5. $Which of the following factors may be regarded as the main cause of lanthanide contraction?$ (1) $Greater shielding of 5d electrons by 4f electrons$ (2) $Poorer shielding of 5d electron by 4f electrons$ (3) $Effective shielding of one of 4f electrons by another in the sub-shell$ (4) $Poor shielding of one of 4f electron by another in the sub-shell.$ 6. $A solution of C r O_{5} in amyl alcohol has a....colour$ (1) $Green$ (2) $Orange-Red$ (3) $Yellow$ (4) $Blue$ 7. $In which one of the following pairs, both the elements does not have (n - 1) d^{10} n s^{2} configuration in its elementary state?$ (1) $Zn, Cd$ (2) $Cd, Hg$ (3) $Hg, Cn$ (4) $Cu, Zn$ 8. $Which one of the following is used to remove most of plutonium from spent nuclear fuel?$ (1) $C l F_{3}$ (2) $O_{2} F_{2}$ (3) $I_{2} O_{5}$ (4) $B r O_{3}$ 9. $Choose the correct statement. Fe^{3 +} ion is more stable than Fe^{2 +} ion because$ (1) $More the charge on the atom, more is its stability$ (2) $Configuration of Fe^{2 +} is 3 d^{6} while Fe^{3 +} is 3 d^{5}$ (3) $Fe^{2 +} has a larger size than that of Fe^{3 +}$ (4) $Fe^{3 +} ions are coloured$ 10. $Which of the following elements are not regarded as transition elements?$ (1) $Zn, Cd, Hg$ (2) $Cu, Zn, Hg$ (3) $Ag, Zn, Hg$ (4) $Ag, Cd, Hg$ 11. $Which of the following exhibits only + 3 oxidation state?$ (1) $U$ (2) $Th$ (3) $Ac$ (4) $Pa$ 12. $A mixture of NaCl and K_{2} Cr_{2} O_{7} is heated with conc. H_{2} SO_{4}, deep red vapours are formed. Which of the following statements is false?$ (1) $The vapours give a yellow solution with NaOH .$ (2) $The vapours contain CrO_{2} Cl_{2} only.$ (3) $The vapours contains CrO_{2} Cl_{2} and Cl_{2} .$ (4) $The vapours when passed into lead acetate in acetic acid gives a yellow precipitate.$ 13. $When a mixture of manganese dioxide, potassium hydroxide and potassium chlorate is fused, the product obtained are$ (1) $K_{2} SO_{4}$ (2) $K_{2} MnO_{3}$ (3) $K_{2} MnO_{4}$ (4) $KMnO_{4}$ 14. $Identify the inorganic sulphides that are yellow in colour: (A) (NH_{4})_{2} S (B) Pbs (C) Cus (D) As_{2} S_{3} (E) As_{2} S_{5} Choose the correct answer from the options given below:$ (1) $(A), (D) and (E) only$ (2) $(D) and (E) only$ (3) $(A) and (B) only$ (4) $(A) and (C) only$ 15. $In chromyl chloride, the number of d-electrons present on chromium is same as in (Given at no. of Ti : 22, V : 23, Cr : 24, Mn : 25, Fe : 26)$ (1) $V (IV)$ (2) $Mn (VII)$ (3) $Fe (III)$ (4) $Ti (III)$ 16. $A transition metal exists in its highest oxidation state. It is expected to behave as$ (1) $an oxidising agent$ (2) $a reducing agent$ (3) $a chelating agent$ (4) $a central metal in a co-ordination compound.$ 17. $In a transition series, with the increase in atomic number, the paramagnetism$ (1) $increases gradually$ (2) $decreases gradually$ (3) $first increases to a maximum and then decreases$ (4) $first decreases to a minimum and then increases.$ 18. $Find the compound ' A' from the following reaction sequences. A \to aqua - regia B \to (1) KNO_{2} ∣ NH_{4} OH (b) AcOH yellow ppt$ (1) $CoS$ (2) $ZnS$ (3) $NiS$ (4) $MnS$ 19. $The pair of metal ions that can give a spin-only magnetic moment of 3.9 BM for the complex [M (H_{2} O)_{6}] C l_{2} is :$ (1) $C r^{2 +} and M n^{2 +}$ (2) $V^{2 +} and C o^{2 +}$ (3) $V^{2 +} and F e^{2 +}$ (4) $C o^{2 +} and F e^{2 +}$ 20. $What are different possible oxidation states exhibited by scandium?$ (1) $+4$ (2) $+5$ (3) $+ 4, + 5$ (4) $+ 2, + 3$ 21. $Which one of the following is correct for all elements from Sc to Cu?$ (1) $The lowest oxidation state shown by them is +2 .$ (2) $4 s orbital is completely filled in the ground state.$ (3) $3 d orbital is not completely filled in the ground state.$ (4) $The ions in +2 oxidation states are paramagnetic.$ 22. $The basic character of the transition metal monoxide follows the order: (At. no. : Ti = 22, V = 23, Cr = 24, Fe = 26)$ (1) $VO > CrO > TiO > FeO$ (2) $CrO > VO > FeO > TiO$ (3) $TiO > FeO > VO > CrO$ (4) $TiO > VO > CrO > FeO$ 23. $Identify the incorrect statement among the following:$ (1) $Lanthanoid contraction is the accumulation of successive shrinkages.$ (2) $As a result of lanthanoid contraction, the properties of 4 d series of the transition elements have no similarities with the 5 d series of elements.$ (3) $Shielding power of 4 f electrons is quite weak.$ (4) $There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu.$ 24. $The pair of lanthanides in which both elements have high third-ionization energy is:$ (1) $Dy,Gd$ (2) $Lu,Yb$ (3) $Eu,Yb$ (4) $Eu,Gd$ 25. $Which one of the following lanthanide ions does not exhibit paramagnetism?$ (1) $Lu^{3 +}$ (2) $Ce^{3 +}$ (3) $Eu^{3 +}$ (4) $Yb^{3 +}$ 26. $Which of the following pairs has both the ions coloured in aqueous solution? [Atomic number of Sc = 21, Ti = 22, Ni = 28, Cu = 29, Mn = 25]$ (1) $Sc^{3 +}, Mn^{2 +}$ (2) $Ni^{2 +}, Ti^{4 +}$ (3) $Ti^{3 +}, Cu^{+}$ (4) $Mn^{2 +}, Ti^{3 +}$ 27. $Select the coloured compound amongst the following : (Atomic no. Ti = 22, Cr = 24, Cu = 29, Zn = 30)$ (1) $TiCl_{4}$ (2) $ZnCl_{2}$ (3) $CrCl_{3}$ (4) $CuCl$ 28. $Which of the following oxidation reactions are carried out by both K_{2} Cr_{2} O_{7} and KMnO_{4} in acidic medium? A. Γ^{-} \to I_{2} B. S^{2 -} \to S C. Fe^{2 +} \to Fe^{3 +} D. Γ^{-} \to IO_{3}^{-} E. S_{2} O_{3}^{2 -} \to SO_{4}^{2 -} Choose the correct answer from the options given below:$ (1) $C, D and E Only$ (2) $B, C and D Only$ (3) $A, D and E Only$ (4) $A, B and C Only$ 29. $The most common oxidation state of Lanthanoid elements is +3. Which of the following is likely to deviate easily from +3 oxidation state?$ (1) $Ce (At. No. 58)$ (2) $La (At. No. 57)$ (3) $Lu (At. No. 71)$ (4) $Gd (At. No. 64)$ 30. $Potassium dichromate is a good oxidizing agent, in acidic medium the oxidation state of chromium changes by$ (1) $2$ (2) $3$ (3) $4$ (4) $5$