Q 31 :

During the reaction of permanganate with thiosulphate, the change in oxidation of manganese occurs by value of 3. Identify which of the below medium will favour the reaction.       [2023]

• Both aqueous acidic and neutral

   

• Both aqueous acidic and faintly alkaline

   

• Aqueous acidic

   

• Aqueous neutral

   

Q 32 :

In chromyl chloride, the number of d-electrons present on chromium is same as in (Given atomic number of Ti : 22, V : 23, Cr : 24, Mn : 25, Fe : 26)                [2023]

• Fe (III)

   

• Mn (VII)

   

• Ti (III)

   

• V (IV)

   

Q 33 :

Given below are two statements:

Statement I: Aqueous solution of ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ is preferred as primary standard in volumetric analysis over ${\mathrm{Na}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ aqueous solution.

Statement II: ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ has a higher solubility in water than ${\mathrm{Na}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$.

In the light of the above statements, choose the correct answer from the options given below:                [2023]

• Statement I is true but Statement II is false.

   

• Both Statement I and Statement II are false.

   

• Both Statement I and Statement II are true.

   

• Statement I is false but Statement II is true.

   

Q 34 :

Prolonged heating is avoided during the preparation of ferrous ammonium sulphate to               [2023]

• prevent breaking

   

• prevent reduction

   

• prevent oxidation

   

• prevent hydrolysis

   

Q 35 :

The number of electrons involved in the reduction of permanganate to manganese dioxide in acidic medium is __________.  [2023]

Q 36 :

In alkaline medium, the reduction of permanganate anion involves a gain of __________ electrons.  [2023]

Q 37 :

The total change in the oxidation state of manganese involved in the reaction of ${\mathrm{KMnO}}_4$ and potassium iodide in the acidic medium is __________.  [2023]

Q 38 :

In Chromyl chloride, the oxidation state of chromium is (+) __________.         [2023]