22465.During the process of electrolytic refining of copper, some metals present as impurity settle as ‘anode mud’. These are
Sn and Ag
Pb and Zn
Ag and Au
Fe and Ni
22466.Which of the following arrangements does not represent the correct order of the property stated against it?
V2+ < Cr2+ < Mn2+ < Fe2+ : paramagnetic behaviour
Ni2+ < Co2+ < Fe2+ < Mn2+ : ionic size
Co3+ < Fe3+ < Cr3+ < Sc3+ : stability inaqueous solution
Sc < Ti < Cr < Mn : number of oxidation states
22467.Which one of the following sets correctly represents the increase in the paramagnetic property of the ion?
Cu2+ < V2+ < Cr2+ < Mn2+
Cu2+ < Cr2+ < V2+ < Mn2+
Mn2+ < V2+ < Cr2+ < Cu2+
Mn2+ < Cu2+ < Cr2+ < V2+
22468.Which of the following statements about the interstitial compounds is incorrect?
They retain metallic conductivity
They are chemically reactive
They are much harder than the pure metal
They have higher melting points than the pure metal
22473.In the electrolytic refining of Zinc, ______.
the impure metal is at the cathode.
graphite is at the anode.
acidified zinc sulphate is the electrolyte.
the metal ion gets reduced at the anode.
22474.A red solid is insoluble in water. However, it becomes soluble if some KI is added to water. Heating the red solid in a test tube results in liberation of some violet coloured fumes and droplets of a metal appear on the cooler parts of the test tube. The red solid is
(NH4)2Cr2O7
HgI2
HgO
Pb3O4
22475.The outer electron configuration of Gd (Atomic number: 64) is:
4f3 5d5 6s2
4f8 5d0 6s2
4f4 5d4 6s2
4f7 5d1 6s2
22476.Anhydrous ferric chloride is prepared by
Dissolving Fe(OH)3 in concentrated HCl
Dissolving Fe(OH)3 in dilute HCl
Passing dry HCl over heated iron scrap
Passing dry Cl2 gas over heated iron scrap
22479.KMnO4 can be prepared from K2MnO4 as per the reaction:
3MnO2–
4 + H2O ⇌ 2MnO–
4 + MnO2 + 4OH–
The reaction can go to completion by removing OH– ions by adding
KOH
CO2
SO2
HCl
22480.The correct order of $\text{E}_{\text{M}^{2+}/\text{M}}^o$ values with negative sign for the four successive elements Cr, Mn, Fe and Co is
Cr > Mn > Fe > Co
Mn > Cr > Fe > Co
Cr > Fe > Mn > Co
Fe > Mn > Cr > Co
22481.Extraction for zinc blende is achieved by
electrolytic reduction
roasting followed by reduction with carbon
roasting followed by reduction with another metal
roasting followed by self reduction
22482.Gold is extracted by hydro metallurgical process, based on its property
of being electropositive
of being less reactive
to form complexes which ani water soluble
to form salts which are water soluble
22483.Which pair of compounds is expected to show similar colour in aqueous medium?
FeCl2 and CuCl2
VOCl2 and CuCl2
VOCl2 and FeCl2
FeCl2 and MnCl2