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Classification of Elements and Periodicity in Properties · Question 33

AIPMT 2007MCQEasy📈 Topic in 50% papers+4−1
1

With which of the following electronic configuration an atom has the lowest ionisation enthalpy?

  1. 1s2 2s2 2p3
  2. 1s2 2s2 2p6 3s1
  3. 1s2 2s2 2p6
  4. 1s2 2s2 2p5

Answer

(2) 1s2 2s2 2p6 3s1

Solution

The configurations belong to: (1) N, (2) Na, (3) Ne, (4) F.

As per NCERT, alkali metals have the lowest ionisation enthalpies in each period, because the single ns electron is far from the nucleus and well shielded, and its removal gives a stable noble gas configuration.

⇒ Ne (noble gas, stable octet) has the highest value; N and F (small, high nuclear charge, n = 2) also have high values.

∴ Na (1s2 2s2 2p6 3s1) has the lowest ionisation enthalpy.

Answer: (2)

AIPMT 2007

Keep practising — Classification of Elements and Periodicity in Properties

2

Which of the following is the most basic oxide?

  1. SeO2
  2. Al2O3
  3. Sb2O3
  4. Bi2O3
AIPMT 2006
3

Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species ?

  1. S < O < Cl < F
  2. Cl < F < S < O
  3. F < Cl < O < S
  4. O < S < F < Cl
AIPMT 2005
4

A nuclide of an alkaline earth metal undergoes radioactive decay by emission of three -particles in succession. The group of the periodic table to which the resulting daughter element would belong is

  1. Gr. 13
  2. Gr. 17
  3. Gr. 14
  4. Gr. 16
AIPMT 2005
5

Ionic radii are

  1. inversely proportional to effective nuclear charge
  2. inversely proportional to square of effective nuclear charge
  3. directly proportional to effective nuclear charge
  4. directly proportional to square of effective nuclear charge.
AIPMT 2004
6

The ions O2-, F-, Na+, Mg2+ and Al3+ are isoelectronic. Their ionic radii show

  1. a significant increase from O2- to Al3+
  2. a significant decrease from O2- to Al3+
  3. an increase from O2- to F- and then decrease from Na+ to Al3+
  4. a decrease from O2- to F- and then increase from Na+ to Al3+
AIPMT 2003
7

Which of the following is isoelectronic?

  1. CO2, NO2
  2. NO2-, CO2
  3. CN-, CO
  4. SO2, CO2
AIPMT 2002
8

Which of the following order is wrong?

  1. NH3 < PH3 < AsH3 – acidic
  2. Li < Be < B < C – 1st IP
  3. Al2O3 < MgO < Na2O < K2O – basic
  4. Li+ < Na+ < K+ < Cs+ – ionic radius
AIPMT 2002
9

An atom has electronic configuration 1s2 2s2 2p6 3s2 3p6 3d3 4s2, you will place it in which group?

  1. fifth
  2. fifteenth
  3. second
  4. third
AIPMT 2002
10

Correct order of 1st ionization potential among following elements Be, B, C, N, O is

  1. B < Be < C < O < N
  2. B < Be < C < N < O
  3. Be < B < C < N < O
  4. Be < B < C < O < N
AIPMT 2001

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