JEE Main Chemistry - Atomic Structure and Periodic Properties of Elements
Exam Duration: 60 Mins Total Questions : 30
The wave number of the yellow light of the wave length of 5800 \(\mathring { A } \) emitted by the sodium lamp would be
- (a)
5.17X 1014s-1
- (b)
1.72X 106m-1
- (c)
17.2X 107m-1
- (d)
17.2X 108m-1
The f-subshell contains
- (a)
one-orbital
- (b)
three-orbital
- (c)
five-orbital
- (d)
seven orbitals
The orbital is a space where the probability of finding an electron is
- (a)
95-98%
- (b)
50%
- (c)
0%
- (d)
100%
the proton and neutron are collectively called as
- (a)
deuterium
- (b)
positron
- (c)
meson
- (d)
nucleon
In chromium (at.no.24), the 19th electron is represented by the four quantum numbers (n,l,m,s) as follows:
- (a)
3,2,-2,-1/2
- (b)
3,2,2,+1/2
- (c)
4,1,-1,+1/2
- (d)
4,0,0,+1/2
The mass of an oxygen atoms is
- (a)
2.656X10-23g
- (b)
2.656X1023 g
- (c)
16 g
- (d)
32 g
The electronic configuration of sliver atom in ground state is
- (a)
[Ar]3d104s1
- (b)
[Xe]4f145d106s1
- (c)
[Kr]4d105s1
- (d)
[Kr]4d95s2
Which one of the following is smallest in size?
- (a)
N3-
- (b)
O2-
- (c)
\(\overset { - }{ F } \)
- (d)
Na+
Azimuthal quantum number determines the
- (a)
size
- (b)
spin
- (c)
orientation
- (d)
angular momentum of orbitals
The outer shell configuration of the most electronegative element is
- (a)
ns2 np3
- (b)
ns2 np4
- (c)
ns2 np5
- (d)
ns2 np6
The ratio of energy of photon of \(\lambda\)=2000\(\mathring{A}\) to that of \(\lambda\)=4000\(\mathring{A}\) is:
- (a)
2
- (b)
1/4
- (c)
4
- (d)
1/2
No two electrons in an atom will have all the four quantum numbers same.This statement is known as
- (a)
Exclusion principle
- (b)
Uncertainity principle
- (c)
Hund's rule
- (d)
Aufbau principle
The number of electrons in the M shell of the element with atomic number 24 is
- (a)
24
- (b)
12
- (c)
13
- (d)
8
Which of the following orbitals does not have angular node?
- (a)
2s
- (b)
2p
- (c)
3p
- (d)
3d
The credit of discovering neutron goes to
- (a)
Rutherford
- (b)
Langmuir
- (c)
Chadwick
- (d)
Austen
Which of the following gaseous ions contains maximum number of unpaired electrons?
- (a)
Fe2+
- (b)
Co3+
- (c)
Co2+
- (d)
Fe3+
Which of the following is isoelectronic with carbon atom?
- (a)
Na+
- (b)
AI3+
- (c)
O2-
- (d)
N+
Which of the following configurations represent atoms of elements having the highest second ionisation energy?
- (a)
1s2 2s2 2p4
- (b)
1s2 2s2 2p6
- (c)
1s2 2s2 2p6 3s1
- (d)
1s2 2s2 2p6 3s2
Which of the following pairs of elements belongs to same period of the periodic table?
- (a)
Na, Ca
- (b)
Mg, Sb
- (c)
Ca, CI
- (d)
Ca, Zn
The electronic configuration of four elements are given below.Which element does not belong to the same family?
- (a)
[Xe] 4f14 5d10 6s2
- (b)
[Kr]4d10 5s2
- (c)
[Ne] 3s2 3p5
- (d)
[Ar] 3d10 4s2
Which of the following pairs are chemically dissimilar
- (a)
Na and K
- (b)
Ba and Sr
- (c)
Zr and Hf
- (d)
Ca and Zn
Amongst the following electronic configuration which one will have highest electron affinity?
- (a)
1s1
- (b)
1s22s1
- (c)
1s2 2s2 2p4
- (d)
1s2 2s2 2p5
The correct order if IE1 potential C,N,O and F is
- (a)
C > N >O >F
- (b)
O > N > F > C
- (c)
O > F > N > C
- (d)
F > N > O >C
The alkali metal which is liquid at \(15^{ \circ }C\)is
- (a)
K
- (b)
Cs
- (c)
Na
- (d)
None
The outermost electronic configuration of the most electronegative element is
- (a)
ns2 np3
- (b)
ns2 np4
- (c)
ns2 np5
- (d)
ns2np6
With reference to ionisation potential which one of the following sets is correct?
- (a)
Li > K < Cs
- (b)
B > Li > K
- (c)
Cs > Li > B
- (d)
Cs < Li < K
The pair of ions having same electronic configurations is
- (a)
Cr3+, Fe3+
- (b)
Fe3+, Mn2+
- (c)
Fe3+, Co3+
- (d)
Sc3+, Cr3+
What will be the uncertainty in velocity of a cricket ball of 100 g, if the uncertainty in its position is 1.65 Å?
- (a)
\(\frac{10^{-23}}{\pi}ms^{-1}\)
- (b)
\(\frac{6.6}{\pi}\times10^{-45}ms^{-1}\)
- (c)
\(1.65\times{10^{-43}}ms^{-1}\)
- (d)
\(\frac{10^{-26}}{\pi}ms^{-1}\)
Match the quantum numbers and choose the correct option.
Quantum number | Information |
A. Principal B. Azimuthal C. Magnetic D. Spin |
1. Orientation of the orbital 2. Energy and size of orbital 3. Spin of electron 4. Shape of the orbital |
- (a)
A B C D 1 3 4 2 - (b)
A B C D 2 4 1 3 - (c)
A B C D 3 1 4 2 - (d)
A B C D 2 1 3 4
Given the electronic configuration 1s2, 2s2, 2p3 the number of unpaired electyrons in the atom is
- (a)
0
- (b)
1
- (c)
3
- (d)
7