JEE Main 2023 (Online) 1st February Evening Shift | Structure of Atom Question 85 | Chemistry | JEE Main - ExamSIDE.com

1

JEE Main 2023 (Online) 1st February Evening Shift

MCQ (Single Correct Answer)

+4

-1

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

$$\mathrm{K}^{+}, \mathrm{Cl}^{-}, \mathrm{Ca}^{2+}, \mathrm{Sc}^{3+}$$

2

JEE Main 2023 (Online) 31st January Evening Shift

MCQ (Single Correct Answer)

+4

-1

Arrange the following orbitals in decreasing order of energy.

A. $\mathrm{n}=3, \mathrm{l}=0, \mathrm{~m}=0$

B. $\mathrm{n}=4, \mathrm{l}=0, \mathrm{~m}=0$

C. $\mathrm{n}=3, \mathrm{l}=1, \mathrm{~m}=0$

D. $\mathrm{n}=3, \mathrm{l}=2, \mathrm{~m}=1$

The correct option for the order is :

A

$\mathrm{B}>\mathrm{D}>\mathrm{C}>\mathrm{A}$

B

$\mathrm{A}>\mathrm{C}>\mathrm{B}>\mathrm{D}$

C

$\mathrm{D}>\mathrm{B}>\mathrm{A}>\mathrm{C}$

D

$\mathrm{D}>\mathrm{B}>\mathrm{C}>\mathrm{A}$

3

JEE Main 2023 (Online) 31st January Morning Shift

MCQ (Single Correct Answer)

+4

-1

Which transition in the hydrogen spectrum would have the same wavelength as the Balmer type transition from $$\mathrm{n=4}$$ to $$\mathrm{n}=2$$ of $$\mathrm{He}^{+}$$ spectrum

A

$$\mathrm{n}=3$$ to $$\mathrm{n}=4$$

B

$$\mathrm{n}=2$$ to $$\mathrm{n}=1$$

C

$$\mathrm{n}=1$$ to $$\mathrm{n}=2$$

D

$$\mathrm{n}=1$$ to $$\mathrm{n}=3$$

4

JEE Main 2023 (Online) 30th January Evening Shift

MCQ (Single Correct Answer)

+4

-1

Maximum number of electrons that can be accommodated in shell with $n=4$ are:

A

50

B

32

C

72

D

16

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