JEE Main 2023 (Online) 6th April Evening Shift | d and f Block Elements Question 85 | Chemistry

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.

aqueous neutral

both aqueous acidic and faintly alkaline

both aqueous acidic and neutral

aqueous acidic

JEE Main 2023 (Online) 6th April Morning Shift

MCQ (Single Correct Answer)

-1

Strong reducing and oxidizing agents among the following, respectively, are :

$$\mathrm{Ce}^{4+}$$ and $$\mathrm{Eu}^{2+}$$

$$\mathrm{Eu}^{2+}$$ and $$\mathrm{Ce}^{4+}$$

$$\mathrm{Ce}^{4+}$$ and $$\mathrm{Tb}^{4+}$$

$$\mathrm{Ce}^{3+}$$ and $$\mathrm{Ce}^{4+}$$

JEE Main 2023 (Online) 1st February Evening Shift

MCQ (Single Correct Answer)

-1

Which element is not present in Nessler's reagent?

Mercury

Iodine

Potassium

Oxygen

JEE Main 2023 (Online) 1st February Evening Shift

MCQ (Single Correct Answer)

-1

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : $$\mathrm{Cu^{2+}}$$ in water is more stable than $$\mathrm{Cu^{+}}$$.

Reason (R) : Enthalpy of hydration for $$\mathrm{Cu^{2+}}$$ is much less than that of $$\mathrm{Cu^{+}}$$.

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

(A) is correct but (R) is not correct

Both (A) and (R) are correct but (R) is not the correct explanation of (A)

(A) is not correct but (R) is correct

Both (A) and (R) are correct and (R) is the correct explanation of (A)

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