March 07, 2012

d - Block Elements One Mark Questions

1.      A metal which precipitates gold from its aurocyanide complex is
a) Cr                      b) Ag                           c) Pt                             d) Zn.
2.      Bordeaux mixture contains
a) AgNO3 + HNO3 b) ZnSO4 + H2SO4   c) CuSO4 + Ca(OH)2  d) KMnO4 + HCl
3.      Copper is extracted from
a) Cuprite              b) Copper glance         c) Malachite                d) Copper pyrites.
4.      Ferrochrome is an alloy of
a) Cr, C, Fe, N      b) Cr, Co, Ni, C          c) Fe, C                       d) Cr, Ni, Fe.
5.      Formation of coloured ions is possible when compounds contain
a) paired electrons b) unpaired electrons c) lone pair of electrons d) none of these
6.      If the magnetic moment value is 5.92 BM, the number of unpaired electrons is
a) 5                        b) 3                              c) 4                              d) 6
7.      K2Cr2O7 reacts with KI and dilute sulphuric acid and liberats
a) O2                     b) I2                            c) H2                           d) SO2
8.      Paramagnetism is the property of
a) paired electrons                                     b) completely filled electronic sub-shells
c) unpaired electrons                                 d) completely vacant electronic sub-shells.
9.      Silver obtained from silver coin is purified by fusion with
a) AgNO3            b) HNO3                     c) H2SO4                    d) borax.
10.  Silver salt used in photography is
a) AgCl                 b) AgNO3                   c) AgF                         d) AgBr.
11.  Spitting of silver can be prevented by covering the molten metal with a thin layer of
a) borax                 b) charcoal                   c) sand                         d) silver bromide.
12.  The catalyst used in the manufacture of polythene is
a) V2O5                b) Fe                            c) Mo                           d) TiCl4.
13.  The chemical composition of slag formed during the smelting process in the extraction of copper is
a) Cu2O + FeS      b) FeSiO3                    c) CuFeS2                   d) Cu2S + FeO.
14.  The colour of Purple of Cassius is
a) purple (or) red   b) blue                         c) bluish green             d) apple green
15.  The correct electronic configuration of copper atom is
a) 3d10 4s2              b) 3d10 4s1                   c) 3d9 4s2                     d) 3d5 4s2
16.  The general outer electronic configuration of d block elements is
a) (n-1)dl-l0             b) (n-1)d1-10 nsl-2          c) (n-1)d10 nsl-2                d) (n-1)d5 ns1.
17.  The ion with maximum number of unpaired electrons is / Which of the following has the maximum number of unpaired electrons?
a) Mn2+                  b) Ti3+                          c) V3+                          d) Fe2+
18.  The metal used in galvanising iron sheets is
a) chromium          b) zinc                             c) copper                     d) silver.
19.  The number of unpaired electrons in Ti+3 is 1. Its magnetic moment in BM is
a) 1.414                 b) 2                              c) 1.732                       d) 3
20.  The outer(most) electronic configuration of chromium is
a) 3d6 4s0               b) 3d5 4s1                     c) 3d4 4s2                     d) 3d3 4s2 4p1.
21.  The reagent which is added first in the separation of silver from silver coin is
a) conc. sulphuric acid b) conc. hydrochloric acid c) conc. nitric acid     d) Aqua regia.
22.  The substance used in making ruby-red glass and high class pottery is
a) colloidal silver   b) purple of Cassius    c) ruby silver               d) ruby copper
23.  The transition element showing maximum oxidation state is / Which transition element shows the highest oxidation state?
a) Sc                      b) Ti                          c) Os                            d) Zn.
24.  The transition element with the lowest atomic number is
a) scandium           b) titanium                   c) zinc                          d) lanthanum.
25.  When excess of KCN is added to an aqueous solution of copper sulphate, it gives /
       Which compound is formed when excess of KCN is added to an aqueous solution of copper sulphate?
a) Cu(CN)2 / Cu2(CN)2   b) K2[Cu(CN)6]   c) K[Cu(CN)2d) Cu2(CN)2 + (CN)2.
26.  Which of the following compounds will not give positive Chromyl Chloride Test?
a) CuCl2                b) C6H5Cl                  c) ZnCl2                      d) HgCl2.
27.  Which of the following is wrong statement regarding K2Cr2O7?
a) Oxidising agent                                     b) Used in tanning industry
c) Soluble in water                                    d) Reduces ferric sulphate to ferrous sulphate.
28.  Which of the following ions will give colourless aqueous solution?
a) Ni2+                   b) Cu+                          c) Cu2+                         d) Fe2+.
29.  Which of the following pairs have almost equal radii?
a) Mo, W               b) Y, La                       c) Zr, Hf                      d) Nb, Ta.
30.  Which one of the following will have maximum magnetic moment?
a) 3d2                     b) 3d6                          c) 3d7                           d) 3d9.
31. The most malleable and ductile of all metals is
a) silver                   b) gold                          c) copper                       d) zinc

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