1
JEE Main 2022 (Online) 24th June Evening Shift
MCQ (Single Correct Answer)
+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
2
JEE Main 2022 (Online) 24th June Morning Shift
MCQ (Single Correct Answer)
+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)
3
JEE Main 2021 (Online) 26th August Morning Shift
MCQ (Single Correct Answer)
+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
4
JEE Main 2021 (Online) 27th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
If the Thompson model of the atom was correct, then the result of Rutherford's gold foil experiment would have been :
A
All of the $$\alpha$$-particles pass through the gold foil without decrease in speed.
B
$$\alpha$$-particles are deflected over a wide range of angles.
C
All $$\alpha$$-particles get bounced back by 180$$^\circ$$
D
$$\alpha$$-particles pass through the gold foil deflected by small angles and with reduced speed.
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