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

The minimum energy that must be possessed by photons in order to produce the photoelectric effect with platinum metal is :

[Given : The threshold frequency of platinum is 1.3 $$\times$$ 1015 s$$-$$1 and h = 6.6 $$\times$$ 10$$-$$34 J s.]

A
3.21 $$\times$$ 10$$-$$14 J
B
6.24 $$\times$$ 10$$-$$16 J
C
8.58 $$\times$$ 10$$-$$19 J
D
9.76 $$\times$$ 10$$-$$20 J
2
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+
3
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
4
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)
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