D Block Jeemain - Guru
D Block Jeemain - Guru
D Block Jeemain - Guru
guru
Q.1 (T) imparts violet colour compd. ( U ) conc . H 2SO 4 (V)Red gas NaOH AgNO 3
(W)Red ppt.
NH3 so ln . (X)
NaOH
(W) Red ppt.dil
. HCl
(Y) white ppt.
(U) (Z) gas (gives white fumes with HCl)
sublimes on heating
Identify (T) to (Z).
(A) T = KMnO4, U = HCl, V = Cl2, W = HgI2, X = Hg(NH2)NO3, Y = Hg2Cl2, Z = N2
(A) CrO5 and H2O (B) Cr2O3 and H2O (C) CrO2 and H2O (D) CrO and H2O
KI dil H SO
Q.21 Y(g ) CuSO4 2
4 X(Blue colour) , X and Y are
(A) X = I2, Y = [Cu(H2O)4]2+ (B) X = [Cu(H2O)4]2+, Y = I2
+
(C) X = [Cu(H2O)4] , Y = I2 (D) X = [Cu(H2O)5]2+, Y = I2
Q.22 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 (n–1)d orbitals
(C) completion of ns-orbitals (D) inert pair effect
Q.23 (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.24 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.25 Coinage metals show the properties of
(A) typical elements (B) normal elements
(C) inner-transition elements (D) transition element
Q.26 Iron becomes passive by ..................... due to formation of .....................
(A) dil. HCl, Fe2O3 (B) 80% conc. HNO3, Fe3O4
(C) conc. H2SO4, Fe3O4 (D) conc. HCl, Fe3O4
Q.32
Q.42 To an acidified dichromate solution, a pinch of Na2O2 is added and shaken. What is observed:
(A) blue colour (B) Red colour changing to green
(C) Copious evolution of oxygen (D) Bluish - green precipitate
Q.43 The rusting of iron is formulated as Fe2O3·xH2O which involves the formation of
(A) Fe2O3 (B) Fe(OH)3 (C) Fe(OH)2 (D) Fe2O3 + Fe(OH)3
Q.44 Metre scales are made-up of alloy
(A) invar (B) stainless steel (C) elektron (D) magnalium
Q.45 Amongst CuF2, CuCl2 and CuBr2
(A) only CuF2 is ionic
(B) both CuCl2 and CuBr2 are covalent
(C) CuF2 and CuCl2 are ionic but CuBr2 is covalent
(D) CuF2, CuCl2 as well as CuBr2 are ionic
Q.46 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.47 Solid CuSO4·5H2O 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.48 CuSO4(aq) + 4NH3 X, then X is
(A) [Cu(NH3)4]2+ (B) paramagnetic
(C) coloured (D) of a magnetic moment of 1.73 BM
Q.49 KMnO4 + HCl H2O + X(g), X is a
(acidified)
(A) red liquid (B) violet gas (C) greenish yellow gas (D) yellow-brown gas
Q.50 Purple of cassius is:
(A) Pure gold (B) Colliodal solution of gold
(C) Gold (I) hydroxide (D) Gold (III) chloride
Q.51 Amongst the following species, maximum covalent character is exhibited by
(A) FeCl2 (B) ZnCl2 (C) HgCl2 (D) CdCl2
Q.52 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.53 Amphoteric oxide(s) of Mn is/are
(A) MnO2 (B) Mn3O4 (C) Mn2O7 (D) MnO
Q.54 Pick out the incorrect statement:
(A) MnO 24 is quite strongly oxidizing and stable only in very strong alkalies. In dilute alkali, neutral
solutions, it disproportionates.
(B) In acidic solutions, MnO 4 is reduced to Mn2+ and thus, KMnO4 is widely used as oxidising agent
(C) KMnO4 does not acts as oxidising agent in alkaline medium
(D) KMnO4 is manufactured by the fusion of pyrolusite ore with KOH in presence of air or KNO3,
followed by electrolytic oxidation in alkaline solution.
Q.55 The aqueous solution of CuCrO4 is green because it contains
(A) green Cu2+ ions (B) green CrO42– ions
2+
(C) blue Cu ions and green CrO4 ions 2– (D) blue Cu2+ ions and yellow CrO42– ions
Q.56 Manganese steel is used for making railway tracks because
(A) it is hard with high percentage of Mn (B) it is soft with high percentage of Mn
(C) it is hard with small concentration of manganese with impurities
(D) it is soft with small concentration of manganese with impurities
Q.57 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.58 Acidified KMnO4 can be decolourised by
(A) SO2 (B) H2O2 (C) FeSO4 (D) FeCl3
Q.59 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.60 The lanthanide contraction is responsible for the fact that
(A) Zr and Hf have same atomic sizes (B) Zr and Hf have same properties
(C) Zr and Hf have different atomic sizes (D) Zr and Hf have different properties
Q.61 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.62 An ion of definite magnetic moment (spin only) is
(A) Sc3+ (B) Ti3+ (C) Cu2+ (D) Zn2+
Q.63 The electrons which take part in order to exhibit variable oxidation states by transition metals are
(A) ns only (B) (n–1)d only
(C) ns and (n–1)d only but not np (D) (n–1)d and np only but not ns
Q.64 ‘Bordeaux mixture’ is used as a fungicide. It is a mixture of
(A) CaSO4 + Cu(OH)2 (B) CuSO4 + Ca(OH)2
(C) CuSO4 + CaO (D) CuO + CaO
Q.65 Which of the following reaction is possible at anode?
(A) 2Cr3+ + 7H2O Cr2O 72 + 14 H+ (B) F2 2 F–
1
(C) 2 O 2 + 2H+ H2O (D) None of these
Q.66 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.67 Peacock ore is:
(A) FeS2 (B) CuFeS2 (C) CuCO3.Cu(OH)2 (D) Cu5FeS4
Q.68 “925 fine silver” means an alloy of:
(A) 7.5 % Ag and 92.5% Cu (B) 92.5 % Ag and 7.5 % Cu
(C) 80% Ag and 20 % Cu (D) 90 % Ag and 10% Cu
Q.69 Iron salt used in blue prints is:
(A) FeC2O4 (B) Fe2(C2O4)3 (C) K4[Fe(CN)6] (D) K3[Fe(CN)6]
Q.70 When acidified KMnO4 is added to hot oxalic acid solution, the decolourization is slow in the beginning,
but becomes very rapid after some time. This is because:
(A) Mn2+ acts as autocatalyst (B) CO2 is formed as the product
(C) Reaction is exothermic (D) MnO 4 catalyses the reaction
Question No. 71 to 80
Questions given below consist of two statements each printed as Assertion (A) and Reason (R); while
answering these questions you are required to choose any one of the following four responses:
(A) if both (A) and (R) are true and (R) is the correct explanation of (A)
(B) if both (A) and (R) are true but (R) is not correct explanation of (A)
(C) if (A) is true but (R) is false
(D) if (A) is false and (R) is true
Q.73 Assertion : The highest oxidation state of chromium in its compounds is +6.
Reason : Chromium atom has only six electrons in ns and (n–1) d orbitals.
Q.74 Assertion : CrO3 reacts with HCl to form chromyl chloride gas.
Reason : Chromyl chloride (CrO2Cl2) has tetrahedral shape.
Q.75 Assertion : Zinc does not show characteristic properties of transition metals.
Reason : In zinc outermost shell is completely filled.
Q.77 Assertion : Equivalent mass of KMnO4 is equal to one-third of its molecular mass when it acts as an
oxidising agent in an alkaline medium.
Reason : Oxidation number of Mn is +7 in KMnO4.
ANSWER KEY