1
JEE Main 2022 (Online) 25th June Morning Shift
+4
-1

The pair, in which ions are isoelectronic with AI3+ is :

A
Br$$-$$ and Be2+
B
Cl$$-$$ and Li+
C
S2$$-$$ and K+
D
O2$$-$$ and Mg2+
2
JEE Main 2022 (Online) 24th June Evening Shift
+4
-1

The energy of one mole of photons of radiation of wavelength 300 nm is

(Given : h = 6.63 $$\times$$ 10$$-$$34 J s, NA = 6.02 $$\times$$ 1023 mol$$-$$1, c = 3 $$\times$$ 108 m s$$-$$1)

A
235 kJ mol$$-$$1
B
325 kJ mol$$-$$1
C
399 kJ mol$$-$$1
D
435 kJ mol$$-$$1
3
JEE Main 2022 (Online) 24th June Morning Shift
+4
-1

Consider the following pairs of electrons

(A) (a) n = 3, $$l$$ = 1, m1 = 1, ms = + $${1 \over 2}$$

(b) n = 3, 1 = 2, m1 = 1, ms = + $${1 \over 2}$$

(B) (a) n = 3, $$l$$ = 2, m1 = $$-$$2, ms = $$-$$$${1 \over 2}$$

(b) n = 3, $$l$$ = 2, m1 = $$-$$1, ms = $$-$$$${1 \over 2}$$

(C) (a) n = 4, $$l$$ = 2, m1 = 2, ms = + $${1 \over 2}$$

(b) n = 3, $$l$$ = 2, m1 = 2, ms = + $${1 \over 2}$$

The pairs of electrons present in degenerate orbitals is/are :

A
Only (A)
B
Only (B)
C
Only (C)
D
(B) and (C)
4
JEE Main 2021 (Online) 26th August Morning Shift
+4
-1
Given below are two statements.

Statement I : According to Bohr's model of an atom, qualitatively the magnitude of velocity of electron increases with decrease in positive charges on the nucleus as there is no strong hold on the electron by the nucleus.

Statement II : According to Bohr's model of an atom, qualitatively the magnitude of velocity of electron increases with decrease in principal quantum number.

In the light of the above statements, choose the most appropriate answer from the options given below :
A
Both Statement I and Statement II are false
B
Both Statement I and Statement II are true
C
Statement I is false but Statement II is true
D
Statement I is true but Statement II is false
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Modern Physics
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