1
JEE Main 2021 (Online) 27th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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.
2
JEE Main 2021 (Online) 27th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Given below are two statements :

Statement I : Rutherford's gold foil experiment cannot explain the line spectrum of hydrogen atom.

Statement II : Bohr's model of hydrogen atom contradicts Heisenberg' uncertainty principle.

In the light of the above statements, choose the most appropriate answer from the options given below :
A
Statement I is false but statement II is true.
B
Statement I is true but statement II is false.
C
Both statement I and statement II are false.
D
Both statement I and statement II are true.
3
JEE Main 2021 (Online) 20th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Outermost electronic configuration of a group 13 element, E, is 4s2, 4p1. The electronic configuration of an element of p-block period-five placed diagonally to element, E is :
A
[Kr] 3d10 4s2 4p2
B
[Ar] 3d10 4s2 4p2
C
[Xe] 5d10 6s2 6p2
D
[Kr] 4d10 5s2 5p2
4
JEE Main 2021 (Online) 18th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
Given below are two statements :

Statement I : Bohr's theory accounts for the stability and line spectrum of Li+ ion.

Statement II : Bohr's theory was unable to explain the splitting of spectral lines in the presence of a magnetic field.

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