05 D & F-Block Elements (12th) (E) - WA
05 D & F-Block Elements (12th) (E) - WA
05 D & F-Block Elements (12th) (E) - WA
Single Correct
Q.1 The number of moles of acidified KMnO4 required to convert one mole of sulphite ion into sulphate ion is
(A) 2/5 (B) 3/5 (C) 4/5 (D) 1
Q.7 Transition elements having more tendency to form complex than representative elements (s and p-block
elements) due to
(A) availability of d-orbitals for bonding
(B) variable oxidation states are not shown by transition elements
(C) all electrons are paired in d-orbitals
(D) f-orbitals are available for bonding
Q.9 A compound of mercury used in cosmetics, in Ayurvedic and Yunani medicines and known as Vermilon is
(A) HgCl2 (B) HgS (C) Hg2Cl2 (D) HgI
(A) CrO5 and H2O (B) Cr2O3 and H2O (C) CrO2 and H2O (D) CrO and H2O
Q.12 Transition elements are usually characterised by variable oxidation states but Zn does not show this
property because of
(A) completion of np-orbitals (B) completion of (n1)d orbitals
(C) completion of ns-orbitals (D) inert pair effect
Q.13 (NH4)2Cr2O7 (Ammonium dichromate) is used in fire works. The green coloured powder blown in air is
(A) Cr2O3 (B) CrO2 (C) Cr2O4 (D) CrO3
Q.14 The d-block element which is a liquid at room temperature, having high specific heat, less reactivity than
hydrogen and its chloride (MX2) is volatile on heating is
(A) Cu (B) Hg (C) Ce (D) Pm
Q.19
Q.23 The higher oxidation states of transition elements are found to be in the combination with A and B, which
are
(A) F, O (B) O, N (C) O, Cl (D) F, Cl
Q.25 1 mole of Fe2+ ions are oxidised to Fe3+ ions with the help of (in acidic medium)
(A) 1/5 moles of KMnO4 (B) 5/3 moles of KMnO4
(C) 2/5 moles of KMnO4 (D) 5/2 moles of KMnO4
Q.28 A metal M which is not affected by strong acids like conc. HNO3, conc. H2SO4 and conc. solution of
alkalies like NaOH, KOH forms MCl3 which finds use for toning in photography. The metal M is
(A) Ag (B) Hg (C) Au (D) Cu
Q.29 Solid CuSO45H2O having covalent, ionic as well as co-ordinate bonds. Copper atom/ion forms
................. co-ordinate bonds with water.
(A) 1 (B) 2 (C) 3 (D) 4
Q.33 Number of moles of SnCl2 required for the reduction of 1 mole of K2Cr2O7 into Cr2O3 is (in acidic medium)
(A) 3 (B) 2 (C) 1 (D) 1/3
Q.37 In nitroprusside ion, the iron exists as Fe2+ and NO as NO+ rather than Fe3+ and NO respectively.
These forms of ions are established with the help of
(A) magnetic moment in solid state (B) thermal decomposition method
(C) by reaction with KCN (D) by action with K2SO4
Q.38 Transition elements in lower oxidation states act as Lewis acid because
(A) they form complexes (B) they are oxidising agents
(C) they donate electrons (D) they do not show catalytic properties
Q.39 The Ziegler-Natta catalyst used for polymerisation of ethene and styrene is TiCl4 + (C2H5)3Al, the
catalysing species (active species) involved in the polymerisation is
(A) TiCl4 (B) TiCl3 (C) TiCl2 (D) TiCl
Q.40 The electrons which take part in order to exhibit variable oxidation states by transition metals are
(A) ns only (B) (n1)d only
(C) ns and (n1)d only but not np (D) (n1)d and np only but not ns
Q.43 Colourless solutions of the following four salts are placed separately in four different test tubes and a
strip of copper is dipped in each one of these. Which solution will turn blue?
(A) KNO3 (B) AgNO3 (C) Zn(NO3)2 (D) ZnSO4
Q.48 The rusting of iron is formulated as Fe2O3xH2O which involves the formation of
(A) Fe2O3 (B) Fe(OH)3 (C) Fe(OH)2 (D) Fe2O3 + Fe(OH)3
Q.51 Assertion : The highest oxidation state of chromium in its compounds is 6+.
Reason : Chromium atom has only six electrons in ns and (n1) d orbitals.
Q.53 Assertion : Zinc does not show characteristic properties of transition metals.
Reason : In zinc outermost shell is completely filled.
Q.55 Assertion : Equivalent mass of KMnO4 is equal to one-third of its molecular mass when it acts as an
oxidising agent in an light alkaline medium.
Reason : Oxidation number of Mn is +7 in KMnO4.
Q.60 Addition of non-metals like B and C to the interstitial sites of a transition metal results the metal
(A) of more ductability (B) of less ductability (C) less malleable (D) of more hardness
Q.72 An element of 3d-transition series shows two oxidation states x and y, differ by two units then
(A) compounds in oxidation state x are ionic if x > y
(B) compounds in oxidation state x are ionic if x < y
(C) compounds in oxidation state y are covalent if x < y
(D) compounds in oxidation state y are covalent if y < x
Q.73 To an acidified dichromate solution, a pinch of Na2O2 is added and shaken. What is observed:
(A) blue colour (B) Orange colour changing to green
(C) Copious evolution of oxygen (D) Bluish - green precipitate
Q.79 Ion(s) having non zero magnetic moment (spin only) is/are
(A) Sc3+ (B) Ti3+ (C) Cu2+ (D) Zn2+
Comprehension-1
When hydrogen peroxide is added to an acidified solution of a dichromate gives a deep blue coloured
compound 'A' in presence of organic solvent, which decomposes rapidly in aqueous solution into 'B' and
dioxygen. Compound 'A' can be extracted by dimethyl ether forming the adduct 'C'.
Q.80 The oxidation state of the metal ion in compound 'A' are
(A) 3+ (B) 10 +
(C) 6+ (D) 4+
Comprehension-2
compd. ( U ) conc. H 2SO 4 (V)Red gas NaOH AgNO 3
(T) imparts violet colour
(W)Red ppt.
NH so ln .
3
(X)
(W) Red ppt.dil
. HCl
(Y) white ppt.
(U) NaOH
(Z) gas (gives white fumes with HCl)
sublimes on
Q.91 In the standardization of Na2S2O3 using K2Cr2O7 by iodometry, the equivalent weight of K2Cr2O7 is
(A) (molecular weight ) / 2 (B) (molecular weight) / 6 [JEE 1999]
(C) (molecular weight) / 3 (D) same as molecular weigh
Q.92 Amongst the following, identify the species with an atom in +6 oxidation state. [JEE 2000]
(A) MnO4 (B) Cr(CN)63 (C) NiF62 (D) CrO2Cl2
Q.93 The complex ion which has no "d" electrons in the central atom is (at. no Cr=24, Mn = 25, Fe = 26,
Co = 27) [JEE 2001]
(A) [MnO4] (B) [Co(NH3)6]3+ (C) [Fe(CN)6]3 (D) [Cr(H2O)6]3+
Q.95 When MnO2 is fused with KOH, a coloured compound is formed, the product and its colour is:
(A) K2MnO4, purple colour (B) KMnO4, purple [JEE 2003]
(C) Mn2O3, brown (D) Mn3O4, black
Q.96 The pair of the compounds in which both the metals are in the highest possible oxidation state is
(A) [Fe(N)6]3 , [Co(CN)6]3 (B) CrO2Cl2, MnO4 [JEE 2004]
(C) TiO3 , MnO2 3
(D) [Co(CN)6] , MnO2
Q.97 The product of oxidation of I with MnO4 in alkaline medium is [JEE 2004]
(A) IO3 (B) I2 (C) IO (D) IO4
Q.81 D Q.82 B Q.83 C Q.84 D Q.85 (A) P (B) R (C) Q (D) P,Q,S
Q.86 (A) Q,R,S (B) Q (C) P (D) R,S Q.87 (A) P (B) P,Q,S (C) P,Q,R,S (D) P, S