Important Questions of Redox Reactions Chemistry | Zigya

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101.

Consider a titration of potassium dichromate solution with acidified Mohr's salt solution using diphenyl amine as indicator. The number of moles of Mohr's Salt required per mole of dichromate is:

  • 3

  • 4

  • 5

  • 6


102.

When MnO2 is fused with KOH, a colouredcompound is formed. The product and its colour is:

  • K2MnO4 , purple colour

  • Mn2O3 , brown

  • Mn2O4 , black

  • KaMnO4 , purple


103.

In [NiCl4]2-, the number of unpaired electrons, are

  • 4

  • 2

  • 3

  • 5


104.

H2C2O4 + KMnO4 in acidic medium reacts to have change in oxidation number of Mn from

  • 7 to 5

  • 2 to 7

  • 5 to 7

  • 7 to 2


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105.

Oxidation number Fe in K3 [FeCN)6] is

  • +1

  • +2

  • +3

  • +4


106.

Oxidation number of Cr in K2Cr2O7 is

  • 2

  • 4

  • 6

  • 7


107.

Which of the following is most powerful oxidising agent?

  • I2

  • Cl2

  • Br2

  • F2


108.

Strongest Bronsted base among the following anions is

  • ClO4-

  • ClO3-

  • ClO2-

  • ClO-


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109.

The colourless species is

  • VCl3

  • VOSO4

  • Na3VO4

  • [V(H2O)6]SO4.H2O


110.

For which of the following elements it is difficult to disproportionate in +3 oxidation state ?

  • N

  • As

  • Sb

  • Bi


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