1
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)
2
JEE Main 2023 (Online) 1st February Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

In figure, a straight line is given for Freundrich Adsorption ($$y=3x+2.505$$). The value of $$\frac{1}{n}$$ and $$\log \mathrm{K}$$ are respectively.

JEE Main 2023 (Online) 1st February Evening Shift Chemistry - Surface Chemistry Question 25 English

A
0.3 and log 2.505
B
3 and 2.505
C
3 and 0.7033
D
0.3 and 0.7033
3
JEE Main 2023 (Online) 1st February Evening Shift
MCQ (More than One Correct Answer)
+4
-1
Change Language

The effect of addition of helium gas to the following reaction in equilibrium state, is :

$$\mathrm{PCl}_{5}(\mathrm{g}) \rightleftharpoons \mathrm{PCl}_{3}(\mathrm{g})+\mathrm{Cl}_{2}(\mathrm{g})$$

A
the equilibrium will shift in the forward direction and more of $$\mathrm{Cl}_{2}$$ and $$\mathrm{PCl}_{3}$$ gases will be produced.
B
addition of helium will not affect the equilibrium.
C
helium will deactivate $$\mathrm{PCl}_{5}$$ and reaction will stop.
D
the equilibrium will go backward due to suppression of dissociation of $$\mathrm{PCl}_{5}$$.
4
JEE Main 2023 (Online) 1st February Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Which one of the following sets of ions represents a collection of isoelectronic species?

(Given : Atomic Number : $$\mathrm{F:9,Cl:17,Na=11,Mg=12,Al=13,K=19,Ca=20,Sc=21}$$)

A
$$\mathrm{N}^{3-}, \mathrm{O}^{2-}, \mathrm{F}^{-}, \mathrm{S}^{2-}$$
B
$$\mathrm{Ba}^{2+}, \mathrm{Sr}^{2+}, \mathrm{K}^{+}, \mathrm{Ca}^{2+}$$
C
$$\mathrm{Li}^{+}, \mathrm{Na}^{+}, \mathrm{Mg}^{2+}, \mathrm{Ca}^{2+}$$
D
$$\mathrm{K}^{+}, \mathrm{Cl}^{-}, \mathrm{Ca}^{2+}, \mathrm{Sc}^{3+}$$
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