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31.

When H2O2 is shaken with an acidified solution of K2Cr2O7 in the presence of ether, the ethereal layer turns blue due to the formation of

  • Cr2O3

  • CrO42-

  • Cr2(SO4)3

  • CrO5


32.

Anhydrous ferric chloride is prepared by

  • dissoving 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


33.

In dilute alkaline solution of MnO4- changes to

  • MnO42-

  • MnO2

  • Mn2O3

  • MnO


34.

Which of the following act as an oxidising agent?

  • Np4+

  • Sm2+

  • Eu2+

  • Yb2+


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35.

The compound that is both paramagnetic and coloured is

  • K2Cr2O7

  • (NH4)2 [TiCl6]

  • V0SO4

  • K3[Cu(CN)4]


36.

Transition elements exhibit variable valencies, because they release electrons from the following orbits

  • ns

  • ns and np

  • (n - 1) d and ns

  • nd and (n - 1)d


37.

Although zirconium belongs to 4d and hafnium belongs to 5d transition series even they show similar physical and chemical properties because both

  • belong to d- block

  • have same number of electrons

  • belongs to the same group of the periodic table

  • have similar atomic radius


38.

Which of the following good reducing agent?

  • Yb2+

  • Ce4+

  • Tb4+

  • La3+


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39.

Which of the following will not give tests for free transition metal ion in solution ?

  • K2[Ni(CN)4]

  • FeSO4.K2SO4.24H2O

  • Both of the above

  • None of the above


40.

Zinc oxide loses oxygen on heating according to the reaction

ZnO Heat Zn2+ + 12O2 + 2e-

It becomes yellow on heating because

  • Zn2+ ions and electrons move too interstitial sites and F-centres are created.

  • Oxygen and electron moves at the crystal and ions become yellow

  • Zn2+ again combine with oxygen to give yellow oxide

  • Zn2+ are replaced by oxygen.


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