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Published on: 28/05/2021
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Questions + Answers key
Take MCQ Chemistry Test1.
Give reasons:
i) Zr and Hf have identical sizes
ii) In the titration of FeSO4 with KMnO4 in the acidic medium dil. H2SO4 is used instead of dil HCl.
2.
KMnO4 is used in acidic medium quite frequently than in its aqueous or alkali for oxidizing purpose. Why?
3.
Explain why, Zn (II) salts are white while Mn (VII) are deep purple in colour?
4.
K2PtCI6 is a well known compound whereas corresponding Ni Compound is not known. State a reason for it.
1.
i) Due to lanthanoid contraction
ii) dil. HCl is reducing agent and liberates chlorine on reacting with KMnO4 soln.
2.
In acidic medium MnO4 - involves the addition of 5e- or Eo = +1.52v
3.
due to charge transfer between O2- ion to Mn7+.
4.
This is because Pt4+ is more stable than Ni4+ as the sum of four ionization enthalpies of Pt is less than that of Ni.
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