Periodic Table Important MCQs for NEET 2026 | Periodicity Practice Test
Periodic Table & Periodicity – Important MCQs (NEET 2026)
In which of the following options the order of arrangement does not agree with the variation of property indicated against it ?
I < Br < Cl < F (increasing electron gain enthalpy)
Li < Na < K < Rb (increasing metallic radius)
Al
3+
< Mg
2+
< Na
+
< F
−
(increasing ionic size)
B < C < N < O (increasing first ionisation enthalpy)
The correct order of the decreasing ionic radii among the following isoelectronic species is
Ca
2+
> K
+
> S
2−
> Cl
−
Cl
−
> S
2−
> Ca
2+
> K
+
S
2−
> Cl
−
> K
+
> Ca
2+
K
+
> Ca
2+
> Cl
−
> S
2−
For the second period elements the correct increasing order of first ionization enthalpy is :
Li < B < Be < C < N < O < F < Ne
Li < Be < B < C < O < N < F < Ne
Li < B < Be < C < O < N < F < Ne
Li < Be < B < C < N < O < F < Ne
Which of the following order is wrong?
NH
3
< PH
3
< AsH
3
– acidic
Li < Be < B < C – 1
st
IP
Al
2
O
3
< MgO < Na
2
O < K
2
O – basic
Li
+
< Na
+
< K
+
< Cs
+
– ionic radius
Which one of the following arrangements does not give the correct picture of the trends indicated against it ?
F
2
> Cl
2
> Br
2
> I
2
: Bond dissociation energy
F
2
> Cl
2
> Br
2
> I
2
: Electronegativity
F
2
> Cl
2
> Br
2
> I
2
: Oxidizing power
F
2
> Cl
2
> Br
2
> I
2
: Electron gain enthalpy
Decrease in size from left to right in actinoid series is greater and gradual than that in lanthanoid series due to
5f orbitals have greater shielding effect
4f orbitals are penultimate
4f orbitals have greater shielding effect
5f orbitals have poor shielding effect
The correct decreasing order of atomic radii (pm) of Li, Be, B and C is
Be > Li > B > C
Li > Be > B > C
C > B > Be > Li
Li > C > Be > B
Which one of the following orders is not in accordance with the property stated against it ?
F
2
> Cl
2
> Br
2
> I
2
: Bond dissociation energy
F
2
> Cl
2
> Br
2
> I
2
: Oxidising power
HI > HBr > HCl > HF : Acidic property in water
F > Cl > Br > I : Electronegativity
Which statement is wrong ?
Bond energy of F
2
> Cl
2
Electronegativity of F > Cl
F is more oxidising than Cl
Electron affinity of Cl > F
What is the value of electron gain enthalpy of Na
+
if IE
1
of Na = 5.1 eV?
− 5.1 eV
− 10.2 eV
+ 2.55 eV
+ 10.2 eV
SUBMIT TEST
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