You are currently viewing NEET d and f block elements Previous year Questions with Answer key

NEET d and f block elements Previous year Questions with Answer key

1. Sc (Z = 21) is a transition element but Zn (Z = 30) is not because element b        (NEET 2013)

(a) both Sc3+ and Zn2+ ions are colourless and form white compounds

(b) in case of Sc, 3d orbitals are partially filled but in Zn these are filled

(c) last electron is assumed to be added to 4s level in case of Zn

(d) both Sc and Zn do not exhibit variable oxidation states

2. Which of the following ions has electronic configuration [Ar]3d6? (2010)

(a) Ni3+            (b) Mn3+      (c) Fe3+        (d) Co3+

8. Identify the incorrect statement.                           (NEET 2020)

(a) Cr2+ (d4) is a stronger reducing agent than Fe2+ (d6) in water.

(b) The transition metals and their compounds are known for their catalytic activity due to their ability to adopt multiple oxidation states and to form complexes.

(c) Interstitial compounds are those that are formed when small atoms like H, C or N are trapped inside the crystal lattices of metals.

8. Identify the incorrect statement.                           (NEET 2020)

(a) Cr2+ (d4) is a stronger reducing agent than Fe2+ (d6) in water.

(b) The transition metals and their compounds are known for their catalytic activity due to their ability to adopt multiple oxidation states and to form complexes.

(c) Interstitial compounds are those that are formed when small atoms like H, C or N are trapped inside the crystal lattices of metals.

(d) The oxidation states of chromium in CrO42– and Cr2O72– are not the same.

9. The calculated spin only magnetic moment of Cr2+ ion is  (NEET 2020)

(a) 3.87 BM                     (b) 4.90 BM

(c) 5.92 BM                     (d) 2.84 BM

10.

(a) A – (iv)   B – (v)     C – (ii)          D – (i)

(b) A – (i)     B – (ii)      C – (iii)         D – (iv)

(c) A – (iv)   B – (i)           C   – (ii)          D – (iii)

(d) A – (iii)   B – (v)          C – (i)           D – (ii)

11. Magnetic moment 2.84 B.M. is given by (At. nos. Ni = 28, Ti = 22, Cr = 24, Co = 27)                                                                            (2015)

(a) Cr2+        (b) Co2+       (c) Ni2+        (d) Ti3+

12. Which of the following processes does not involve oxidation of iron? (2015)

(a) Formation of Fe(CO)5 from Fe.

(b) Liberation of H2 from steam by iron at high temperature.

(c) Rusting of iron sheets.

(d) Decolourisation of blue CuSO4 solution by iron.

13. Which of the following statements about the interstitial compounds is incorrect?  (NEET 2013)

(a) They are much harder than the pure metal.

(b) They have higher melting points than the pure metal.

(c) They retain metallic conductivity.

(d) They are chemically reactive.

14. Identify the alloy containing a non-metal as a constituent in it. (2012)

(a) Invar                          (b) Steel

(c) Bell metal                   (d) Bronze

15. The catalytic activity of transition metals and their compounds is ascribed mainly to                                                                           (Mains 2012)

(a) their magnetic behaviour

(b) their unfilled d-orbitals

(c) their ability to adopt variable oxidation states

(d) their chemical reactivity.

16. Which one of the following does not correctly represent the correct order of the property indicated against it?                                                        (Mains 2012)

(a) Ti < V < Cr < Mn; increasing number of oxidation states

(b) Ti3+ < V3+ < Cr3+ < Mn3+ : increasing magnetic moment

(c) Ti < V < Cr < Mn : increasing melting points

(d) Ti < V < Mn < Cr : increasing 2nd ionization enthalpy