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Indian Navy 10+2 B.Tech Cadet p-Block Elements (Groups 15-18) — practice questions

Explore 60 free p-Block Elements (Groups 15-18) questions in Indian Navy 10+2 B.Tech Cadet Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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p-Block Elements (Groups 15-18) questions and exercises with answers

Showing questions 1–30 of 60.

Which of the following is **not** a noble gas?Read the answer and worked solution →The **inert pair effect** is most pronounced in:Read the answer and worked solution →The minimum energy required to remove an electron from the ground state of a hydrogen atom is:Read the answer and worked solution →According to VSEPR theory, the shape of a molecule is determined byRead the answer and worked solution →The hybridisation of carbon in methane (CH₄) isRead the answer and worked solution →What is the valency of an element with electronic configuration 2, 8, 3?Read the answer and worked solution →Which of the following elements does not lose an electron easily?Read the answer and worked solution →Arrange the following elements in the order of their decreasing metallic character Na, Si, Cl, Mg, AlRead the answer and worked solution →Arrange the following elements in the order of their increasing non-metallic character Li, O, C, Be, FRead the answer and worked solution →On moving from left to right in a period in the periodic table, the size of the atom.Read the answer and worked solution →Order the atomic models as they were proposedRead the answer and worked solution →Match each scientist to their modelRead the answer and worked solution →Match each model to what it could NOT explainRead the answer and worked solution →True or false: Rutherford's modelRead the answer and worked solution →True or false: Bohr's modelRead the answer and worked solution →Complete the reason Bohr's model failsRead the answer and worked solution →Which model does this belong to?Read the answer and worked solution →Match each quantum number to what it is calledRead the answer and worked solution →True or false: the quantum mechanical modelRead the answer and worked solution →Order the structure: from atom down to electronRead the answer and worked solution →Complete the (n + l) ruleRead the answer and worked solution →True or false: orbital energiesRead the answer and worked solution →Match each rule to what it forbids or requiresRead the answer and worked solution →Tap every statement Hund's rule requiresRead the answer and worked solution →The fundamental particlesRead the answer and worked solution →Assertion and reasonRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Three of these are wrong. Find the one that holds.Read the answer and worked solution →Which principle is being described?Read the answer and worked solution →Flip and pair: symbol with meaningRead the answer and worked solution →

Worked practice questions

Which of the following is **not** a noble gas?

  1. Argon
  2. Krypton
  3. Bromine
  4. Xenon
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Correct answer: C. Bromine

Noble gases (group 18): He, Ne, Ar, Kr, Xe, Rn, Og. All chemically inert in their natural state (Xe and Kr can form a few compounds under extreme conditions). **Bromine** is a halogen (group 17), not a noble gas. It's a reactive non-metal, liquid at room temperature, deep red-brown.

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The **inert pair effect** is most pronounced in:

  1. Top elements of each group
  2. Heavier elements of groups 13 to 16
  3. Noble gases
  4. First-period elements
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Correct answer: B. Heavier elements of groups 13 to 16

Inert pair effect: the reluctance of the $ns^2$ pair to participate in bonding, found in **heavier** p-block elements (Tl, Pb, Bi, Po). **Reason:** relativistic effects and poor shielding by inner $d$ and $f$ orbitals make the $ns^2$ pair more tightly held in heavier elements. The 'inert pair' stays as a lone pair, so the heaviest member preferentially adopts an oxidation state 2 less than the group oxidation state. Examples: Pb prefers +2 over +4 (PbO₂ is a strong oxidiser) Bi prefers +3 over +5 (NaBiO₃ is a strong oxidiser) Tl prefers +1 over +3 (Tl(III) compounds are scarce). The lighter members (C, N, O, etc.) show no inert pair effect.

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The minimum energy required to remove an electron from the ground state of a hydrogen atom is:

  1. $3.4\,\text{eV}$
  2. $13.6\,\text{eV}$
  3. $27.2\,\text{eV}$
  4. $1.51\,\text{eV}$
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Correct answer: B. $13.6\,\text{eV}$

Ionisation energy is the energy required to take the electron from $n = 1$ to $n = \infty$. $E_\infty - E_1 = 0 - (-13.6) = 13.6\,\text{eV}$. The value $27.2\,\text{eV}$ is the magnitude of the potential energy in the ground state, not the ionisation energy.

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