NEET Questions - Chemistry - Classification of elements and Periodicity in properties

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The most electronegative element possess the electronic configuration

$ ns^2 np^2 $
$ ns^2 np^4 $
$ ns^2 np^5 $
$ ns^2 np ^ 3 $

The ionisation enthalpy of Cs is $ 375.6KJmol^{–1} $ what is the energy required to convert [at mass of Cs = 133] 2.66mg of gaseous Cs completely to $ Cs^+ $

7.512 J
7.512 KJ
7512.2 J
18782 J

The atomic number of elements M, N, & P are x, x–1, x–3. If P is a halogen atom then the type of bond between N & P is

Covalent
Ionic
Coordinate
Metallic

An element X belongs to Gp16 & 5th period. Its atomic number is

34
50
52
85

The position of an element with atomic number 114 is

Period 6 gp 14
Period 6 gp 16
Period 5 gp 18
Period 7 gp 14

The size of Mo is very similar to W due to

Shielding effect
Actinide contraction
Poor Shielding by 4f electrons
Poor shielding by 4d electrons

Choose the correct order ionization energy

$ N \gt O \gt C $
$ F \gt O \gt N $
$ N \gt O \lt F $
$ O \gt F \gt N $

The order of ionization energy of K, Ca, & Ba are

$ K \gt Ca \gt Ba $
$ Ca \gt Ba \gt K $
$ Ba \gt K \gt Ca $
$ K \gt Ba \gt Ca $

The element with zero electron gain enthalpy is

Argon
Lithium
Calcium
Fluorine

Pick the iso electronic species from the following I. $NH_3$ II. $NH^– _ 2 $ III. $CH^+ _3 $ IV. $H_3 O^+ $

ii, iii, iv
i , ii , iv
i , ii , iii , iv
i & iv

The element with atomic number 44 belongs

d– Block
p–Block
s– Block
f–Block

In the third period there are only eight elements because

It is a short period
The 3d orbitals are absent
The d orbitals are absent
When n=3, the maximum number of electrons which can be accommodated are eight

Choose the correct electronic configuration which has the highest difference between first & second ionisation enthalpies.

$ 1s^2 2s^2 2p^6 3s^2 3p^6 4s^1 $
$ 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 $
$ 1s^2 2s^2 2p^4 $
$ 1s^2 2s^2 2p^3 $

The set of quantum numbers for unpaired electron of an element with atomic number 84 are

$ N= 6 , l = 1 , m = \pm 1 , ms = \pm 1/2 $
$ N= 5 , l = 3 , m = 0 , ms = \pm 1/2 $
$ N= 6 , l = 0 , m = 0 , ms = \pm 1/2 $
$ N= 6 , l = 3 , m = 2 , ms = \pm 1/2 $

The elements with highest ionization enthalpy in a period are

Alkaline earth metals
Halogens
Noble gases
Lanthanides

NEET Chemistry Questions: Classification of elements and Periodicity in properties