The reactivity of alkali metals increases, whereas halogen decreases down the group, because:

1. On moving down, ionization enthalpy decreases in group 1 while the electron gain enthalpy becomes less negative in group 17.
2. On moving down, ionization enthalpy increases in group 1 while the electron gain enthalpy becomes less negative in group 17.
3. On moving down, ionization enthalpy increases in group 1 while the electron gain enthalpy becomes less positive in group 17.
4. On moving down, ionization enthalpy decreases in group 17 while the electron gain enthalpy becomes less negative in group 1.

Subtopic:  Ionization Energy (IE) | Electron Affinity (EA) |
 74%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The general outer electronic configuration of s, p, d , and f-block elements respectively would be :

1. ns1-2, nd2np1-6, (n-1)d1-10np0-2, (n-2)f1-14(n-1)d0-10ns2
2. ns1-2, ns2np1-6, (n-1)f1-10ns0-2, (n-2)g1-14(n-1)d0-1ns2
3. ns1-2, ns2np1-6, (n-1)d1-10ns1-2, (n-2)f1-14(n-1)d0-1 ns2
4. np1-2, nd2np1-6, (n-1)d1-10ns0-2, (n-2)f1-14(n-1)d0-10ns2

Subtopic:  Electronic Configuration |
 76%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
Links
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The position of elements with an outer electronic configuration as (n-2) f7(n-1)d1ns2, n = 6 :

1. 6th period and 10th group.

2.  7th period and 3rd group.

3.  6th period and 3rd group.

4. 7th period and 9th group.

Subtopic:  Electronic Configuration |
 75%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

advertisementadvertisement

1st (H1) and 2nd  (H2) Ionization Enthalpies (in kJ mol–1) and the (egH) Electron Gain Enthalpy (in kJ mol–1) of a few elements are given below:

Elements ΔH1 ΔH2 ΔegH
I 520 7300 -60
II 419 3051 -48
III 1681 3374 -328
IV 1008 1846 -295
V 2372 5251 +48
VI 738 1451 -40

The most reactive metal is-
1. VI
2. III
3. I
4. II

Subtopic:  Ionization Energy (IE) |
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The formula of the stable binary compounds that would be formed by 
an element having atomic number 71 and fluorine:

1. LuF6

2. LuF2

3. LuF3

4. LuF4
 

Subtopic:  Nature of Compound |
 64%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The factor that does not affect the valence electron is: 

1. Azimuthal quantum number 2. Nuclear charge (Z)
3. Nuclear mass 4. Number of core electrons
Subtopic:  Electronic Configuration |
 62%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

advertisementadvertisement

The size of isoelectronic species: F, Ne and Na+, is affected by :

1. Nuclear charge (Z)
2. Valence principal quantum number (n)
3. Electron-electron interaction in the outer orbitals
4. None of the above factors because their size is the same

Subtopic:  Atomic Size |
 68%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
Links
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The incorrect statement about ionization enthalpy is:

1. Ionization enthalpy increases for each successive electron.
2. Noble gases have the highest ionization enthalpy.
3. A big jump in ionization enthalpy indicates a stable configuration.
4. Ionization enthalpy of oxygen is higher than that of nitrogen.

Subtopic:  Ionization Energy (IE) |
 77%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
Links
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Match the following isoelectronic species in Column I and Column II: 

Column I Column II
i. F- a. Br-
ii. Ar b. Si2+
iii. Mg c. O2-
iv. Rb+ d. S2-
 
i ii iii iv
1. b c a d
2. c b a d
3. c d b a
4. b c d a
Subtopic:  Atomic Size |
 86%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

advertisementadvertisement

The correct order of ionization energy of W, X, Y and Z is-

1. W > X > Y > Z 2. W < X < Y > Z
3. W < X > Y< Z 4. W > X > Y< Z
Subtopic:  Ionization Energy (IE) |
 66%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
Links
To view explanation, please take trial in the course.
NEET 2025 - Target Batch