JEE Questions for Chemistry The D And F Block Elements Quiz 6 - MCQExams.com

Percentage of silver in the alloy ‘ german silver’ is
  • 1.5%
  • 2.5 %
  • 10%
  • Zero %
Which alloy contains Mg as one of the constituents?
  • Constantan
  • Electron
  • German silver
  • Brass
Impurities of lead in silver are removed by
  • Parke’s process
  • Solvay process
  • Cyanide process
  • Amalgamation process
Which does not form amalgam ?
  • Fe
  • Co
  • Ag
  • Zn
Cupellation process is used in the metallurgy of
  • Fe
  • Cu
  • Ag
  • Al
The equivalent weight of MnSO4 is half of its molecular weight when it is converted to
  • Mn2O3
  • MnO2

  • Chemistry-The d and f Block Elements-8406.png

  • Chemistry-The d and f Block Elements-8407.png
While extracting an elements form its ore, the ore is ground and leached with dil. potassium cyanide solution to form the soluble product potassium argentocyanide. The element is
  • Lead
  • Chromium
  • Manganese
  • Silver
Steel contains
  • Fe + C + Mn
  • Fe + C + Al
  • Fe + Mn
  • Fe + Mn + Cr
Bell metal is an alloy of
  • Cu, Zn and Sn
  • Cu, Zn and Ni
  • Cu and Zn
  • Cu and Sn
Addition of iron fillings to CuSO4 solution caused precipitation of Cu owing to the
  • Reduction of Cu2+
  • Oxidation of Cu2+
  • Reduction of Fe
  • Reduction of Fe3+
From a solution of CuSO4, the metal used to recover copper is
  • Na
  • Ag
  • Hg
  • Fe
Which of the following statements is correct regarding the slag obtained during the extraction of a metal like copper or iron?
  • during the extraction of a metal like copper or iron? The slag is lighter and lower melting than the metal
  • The slag is heavier and lower melting than the metal
  • The slag is lighter and higher melting than the metal
  • The slag is heavier and higher melting than the metal
The compound having blue colour is
  • CuSO4
  • CuSO4. 5H2O
  • PbSO4
  • HgSO4
Cupric hydroxide dissolves in aqueous ammonia due to
  • Reduction to cuprous hydroxide
  • Complex formation
  • Increases in pH
  • The amphoteric nature of Cu(OH)2
Concentration of silver ore is based on its solubility in
  • Conc.HNO3
  • Aqua regia
  • Dil. KCN
  • Conc. KOH
Anhydrous salts of CuF2 and CuSO4 are
  • Red
  • Blue
  • White
  • None
Coinage alloy has following composition
  • Ag + Cu + Ni
  • Cu + Ag + Au
  • Au + Zn + Ag
  • Ag + Fe + Cu
The common oxidation states of Ti are
  • + 2 , + 3
  • + 3 ,+ 4
  • – 3, - 4
  • + 2, + 3 + 4
Which one of the transition metal ions is coloured ?
  • CU+
  • ZN2+
  • Sc3+
  • V4+
Actinides
  • Are all synthetic elements
  • Include element 104
  • Have only short lived isotopes
  • Have variable valency
Coinage metals show the properties of
  • Typical elements
  • Normal elements
  • Transitional elements
  • Inert elements
Common oxidation state of scandium, a transition element, is/are [At. No of Sc = 21]
  • + 4
  • +1
  • +2 and +3
  • + 4 and +1
Among the following statements, the incorrect one is
  • Calamine and siderite are carbonates
  • Argentite and cuprite are oxides
  • Zinc blende and pyrites are sulphides
  • Malachite and azurite are ores of copper
Ammonium dichromate is used in some fire works. The green coloured powder blown in the air is
  • CrO3
  • Cr2O3
  • Cr
  • CrO(O2)
Which of the following element is responsible for oxidation of water to O2 in biological process ?
  • Fe
  • Mn
  • Cu
  • Mo
Addition of high proportions of manganese makes steel useful in making rails of rail roads because manganese
  • Gives hardness to steel
  • Helps the formation of oxides of iron
  • Can remove oxygen and Sulphur
  • Can show highest oxidation state of + 7
Oxidation state of osmium (OS) in OsO4 is
  • + 4
  • + 6
  • + 7
  • + 8
Which of the following transition element shows the highest oxidation state
  • Mn
  • Fe
  • V
  • Cr
Brass is an alloy of
  • Al and Zn
  • Cu and Al
  • Ni and Zn
  • Cu and Zn
The nature of an aqueous solution of FeCl3 is
  • Acidic
  • Basic
  • Amphoteric
  • Neutral
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