The correct order of atomic radii in group 13 elements is
Q8
NEET 2018Oxide nature
Which of the following oxides is most acidic in nature?
Q9
NEET 2018Oxide nature
Among $\ce{CaH2}, \ce{BeH2}, \ce{BaH2}$, the order of ionic character is
Q10
NEET 2018Oxide nature
Magnesium reacts with an element ($X$) to form an ionic compound. If the ground state electronic configuration of ($X$) is $1s^2\,2s^2\,2p^3$, the simplest formula for this compound is
Q11
NEET 2019Ionization energy
For the second period elements the correct increasing order of first ionisation enthalpy is:
Q12
NEET 2019 OdishaOxide nature
Match the oxide given in Column-A with its property given in Column-B:
Column-A:
(i) \ce{Na2O}
(ii) \ce{Al2O3}
(iii) \ce{N2O}
(iv) \ce{Cl2O7}
Column-B:
(a) Neutral
(b) Basic
(c) Acidic
(d) Amphoteric
Which of the following options has all correct pairs?
Q13
NEET 2020Oxide nature
Match the following oxides with their nature.
Column-I (Oxide)
(a) \ce{CO}
(b) \ce{BaO}
(c) \ce{Al2O3}
(d) \ce{Cl2O7}
Column-II (Nature)
(i) Basic
(ii) Neutral
(iii) Acidic
(iv) Amphoteric
Which one of the following is correct?
Q14
NEET 2020Periodic table
Match the following IUPAC provisional names with their IUPAC official names.
Column-I (Name)
(a) Unnilunium
(b) Unniltrium
(c) Unnilhexium
(d) Unununnium
Column-II (IUPAC Official name)
(i) Mendelevium
(ii) Lawrencium
(iii) Seaborgium
(iv) Darmstadtium
Which one of the following is correct?
Q15
NEET 2021
\ce{Zr} ($Z=40$) and \ce{Hf} ($Z=72$) have similar atomic and ionic radii because of:
Q16
NEET 2021Atomic radius
From the following pairs of ions, which one is NOT an isoelectronic pair?
Q17
NEET 2022Periodic table
The IUPAC name of an element with atomic number $119$ is:
Q18
NEET 2022 · NEET 2026 (1)Atomic radius
Identify the incorrect statement from the following:
Q19
NEET 2023 Phase 1Atomic radius
The element expected to form the largest ion to achieve the nearest noble gas configuration is:
Q20
NEET 2023 Phase 2Atomic radius
Which one of the following represents all isoelectronic species?
Q21
NEET 2023 Phase 2Oxide nature
Assertion (A): Lithium and beryllium, unlike their other respective group members, form compounds with pronounced ionic character.
Reason (R): Lithium and magnesium have similar properties due to the diagonal relationship.
Q22
NEET 2023 Phase 2Oxide nature
The correct sequence given below, containing a neutral, an acidic, a basic and an amphoteric oxide respectively, is:
Q23
NEET 2024Ionization energy
Arrange the following elements in increasing order of first ionization enthalpy: \ce{Li}, \ce{Be}, \ce{B}, \ce{C}, \ce{N}.
Q24
NEET 2024Oxide nature
Among Group 16 elements, which one does NOT show the $-2$ oxidation state?
Q25
NEET 2024Electronegativity
Arrange the following elements in increasing order of electronegativity: \ce{N}, \ce{O}, \ce{F}, \ce{C}, \ce{Si}.
Q26
NEET 2025Atomic radius
Which of the following statements are true?
A. Unlike \ce{Ga}, that has a very high melting point, \ce{Cs} has a very low melting point.
B. On the Pauling scale, the electronegativity values of \ce{N} and \ce{Cl} are not the same.
C. \ce{Ar}, \ce{K+}, \ce{Cl-}, \ce{Ca^2+} and \ce{S^2-} are all isoelectronic species.
D. The correct order of the first ionization enthalpies of \ce{Na}, \ce{Mg}, \ce{Al} and \ce{Si} is $\text{Si} > \text{Al} > \text{Mg} > \text{Na}$.
E. The atomic radius of \ce{Cs} is greater than that of \ce{Li} and \ce{Rb}.
Q27
NEET 2025Periodic table
Which among the following electronic configurations belong to main group elements?
A. $[\text{Ne}]3s^1$
B. $[\text{Ar}]3d^3\,4s^2$
C. $[\text{Kr}]4d^{10}\,5s^2\,5p^5$
D. $[\text{Ar}]3d^{10}\,4s^1$
E. $[\text{Rn}]5f^0\,6d^2\,7s^2$
Q28
ReNEET 2026Ionization energy
Assertion A: The first ionization enthalpy of O is lower than that of N and F. Reason R: The loss of an electron from O leads to a stable half-filled $p$ orbital. Choose the most appropriate answer:
Q29
ReNEET 2026Electronegativity
Among the following, the correct trend in electron gain enthalpy (most negative first) is:
Q30
NEET 2026 (1)Oxide nature
The correct order of increasing metallic character of \ce{Na}, \ce{Be}, \ce{P}, \ce{Mg} and \ce{Si} is:
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Q1. Mendeleev placed iodine (I) below bromine in the halogen group even though iodine has a lower atomic weight than tellurium (Te), which he put before it. Modern chemistry keeps this same order with NO break in the rule. What removed the contradiction?
Q2. Why does atomic radius increase as we go DOWN group 1 (Li to Cs), even though the nuclear charge also increases? Use NCERT reasoning.
Q3. Consider these statements about first ionization enthalpy. (1) N > O. (2) O < F. (3) Be > B. (4) A half-filled set of p orbitals gives extra stability. Which combination is fully correct according to NCERT?
Q4. The electron gain enthalpy of neon is positive (+116 kJ mol−1). What is the BEST reason that adding an electron to a noble gas like Ne costs energy instead of releasing it?
Q5. Match each element with the formula of its HIGHEST oxide (the oxide that shows the element in its highest valence).
P. Sodium (Group 1)
Q. Aluminium (Group 13)
R. Sulphur (Group 16)
Q6. Beryllium (Be) and boron (B) are next to each other in period 2. Using the NCERT anomaly, which one needs LESS energy to remove its first electron?
Q7. The valence shell of an element is 5s25p5, its inner core being [Kr]4d10. Which one correctly gives its period, group and block?
Q8. Which species has the same number of electrons as argon, Ar (which has 18 electrons)?
Q9. Down group 1 the nuclear charge actually increases from Li to Cs, yet the first ionization enthalpy decreases. The correct NCERT reason is that:
Q10. Which of the following periodic properties refers to an atom that is BONDED in a molecule, rather than an isolated gaseous atom?
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