1
JEE Main 2023 (Online) 1st February Evening Shift
MCQ (Single Correct Answer)
+4
-1

Which element is not present in Nessler's reagent?

A
Mercury
B
Iodine
C
Potassium
D
Oxygen
2
JEE Main 2023 (Online) 1st February Evening Shift
MCQ (Single Correct Answer)
+4
-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
(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)
3
JEE Main 2023 (Online) 1st February Morning Shift
MCQ (Single Correct Answer)
+4
-1

Given below are two statements:

Statement I: Chlorine can easily combine with oxygen to form oxides; and the product has a tendency to explode.

Statement II: Chemical reactivity of an element can be determined by its reaction with oxygen and halogens.

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

A
Statement I is true but Statement II is false
B
Both the Statements I and II are false
C
Statement I is false but Statement II is true
D
Both the Statements I and II are true
4
JEE Main 2023 (Online) 30th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
$\mathrm{KMnO}_4$ oxidises $\mathrm{I}^{-}$ in acidic and neutral/faintly alkaline solutions, respectively, to
A
$\mathrm{IO}_3^{-} ~\&~ \mathrm{IO}_3^{-}$
B
$\mathrm{I}_2 ~\&~ \mathrm{I}_2$
C
$\mathrm{I}_2 ~\&~ \mathrm{IO}_3^{-}$
D
$\mathrm{IO}_3^{-} ~\&~ \mathrm{I}_2$
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