1
JEE Main 2023 (Online) 6th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

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.

A
aqueous neutral
B
both aqueous acidic and faintly alkaline
C
both aqueous acidic and neutral
D
aqueous acidic
2
JEE Main 2023 (Online) 6th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

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

A
$$\mathrm{Ce}^{4+}$$ and $$\mathrm{Eu}^{2+}$$
B
$$\mathrm{Eu}^{2+}$$ and $$\mathrm{Ce}^{4+}$$
C
$$\mathrm{Ce}^{4+}$$ and $$\mathrm{Tb}^{4+}$$
D
$$\mathrm{Ce}^{3+}$$ and $$\mathrm{Ce}^{4+}$$
3
JEE Main 2023 (Online) 1st February Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Which element is not present in Nessler's reagent?

A
Mercury
B
Iodine
C
Potassium
D
Oxygen
4
JEE Main 2023 (Online) 1st February Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

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