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Classification of Elements and Periodicity in Properties · Question 9

RE-NEET (UG) 2024MCQEasy📈 Topic in 38% papers+4−1
1

The correct decreasing order of atomic radii (pm) of Li, Be, B and C is

  1. Be > Li > B > C
  2. Li > Be > B > C
  3. C > B > Be > Li
  4. Li > C > Be > B

Answer

(2) Li > Be > B > C

Solution

Li, Be, B and C are in the same period (period 2).

Across a period the nuclear charge increases while electrons enter the same shell, so the atomic radius decreases from left to right.

Atomic radii: Li (152 pm) > Be (111 pm) > B (88 pm) > C (77 pm)

Order: Li > Be > B > C

Answer: (2)

RE-NEET (UG) 2024

Keep practising — Classification of Elements and Periodicity in Properties

2

Match List I with List II: Choose the correct answer from the options given below:

  1. A-I, B-II, C-IV, D-III
  2. A-I, B-IV, C-III, D-II
  3. A-I, B-IV, C-II, D-III
  4. A-IV, B-I, C-II, D-III
RE-NEET (UG) 2024
3

The element expected to form largest ion to achieve the nearest noble gas configuration is

  1. F
  2. N
  3. Na
  4. O
NEET (UG) 2023
4

The IUPAC name of an element with atomic number 119 is

  1. ununennium
  2. unnilennium
  3. unununnium
  4. ununoctium
NEET (UG) 2022
5

The correct order of first ionization enthalpy for the given four elements is :

  1. C < F < N < O
  2. C < N < F < O
  3. C < N < O < F
  4. C < O < N < F
NEET (UG) 2022 (Phase 2)
6

If first ionization enthalpies of elements X and Y are 419 kJ mol-1 and 590 kJ mol-1, respectively and second ionization enthalpies of X and Y are 3069 kJ mol-1 and 1145 kJ mol-1, respectively. Then correct statement is :

  1. Both X and Y are alkaline earth metals
  2. X is an alkali metal and Y is an alkaline earth metal
  3. X is an alkaline earth metal and Y is an alkali metal
  4. Both X and Y are alkali metals
NEET (UG) 2022 (Phase 2)
7

Identify the incorrect match.

  1. (b)-(ii)
  2. (c)-(iii)
  3. (d)-(iv)
  4. (a)-(i)
NEET (UG) 2020
8

Match the following : Which of the following is correct option?

  1. (A)-(ii), (B)-(i), (C)-(iv), (D)-(iii)
  2. (A)-(iii), (B)-(iv), (C)-(i), (D)-(ii)
  3. (A)-(iv), (B)-(iii), (C)-(ii), (D)-(i)
  4. (A)-(i), (B)-(ii), (C)-(iii), (D)-(iv)
NEET (UG) 2020
9

For the second period elements the correct increasing order of first ionization enthalpy is :

  1. Li < B < Be < C < N < O < F < Ne
  2. Li < Be < B < C < O < N < F < Ne
  3. Li < B < Be < C < O < N < F < Ne
  4. Li < Be < B < C < N < O < F < Ne
NEET (UG) 2019
10

The element Z = 114 has been discovered recently. It will belong to which of the following family/group and electronic configuration ?

  1. Carbon family, [Rn] 5f14 6d10 7s2 7p2
  2. Oxygen family, [Rn] 5f14 6d10 7s2 7p4
  3. Nitrogen family, [Rn] 5f14 6d10 7s2 7p6
  4. Halogen family, [Rn] 5f14 6d10 7s2 7p5
NEET 2017
11

In which of the following options the order of arrangement does not agree with the variation of property indicated against it ?

  1. I < Br < Cl < F (increasing electron gain enthalpy)
  2. Li < Na < K < Rb (increasing metallic radius)
  3. Al3+ < Mg2+ < Na+ < F- (increasing ionic size)
  4. B < C < N < O (increasing first ionisation enthalpy)
NEET 2016 (Phase 1)

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