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Indian Navy INET States of Matter — practice questions

Explore 34 free States of Matter questions in Indian Navy INET Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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States of Matter questions and exercises with answers

Showing questions 1–30 of 34.

The minimum energy required to remove an electron from the ground state of a hydrogen atom is:Read the answer and worked solution →The bond order of the oxygen molecule O₂ (by molecular orbital theory) isRead the answer and worked solution →As per your syllabus, in CH₄ atomisation requires 1665 kJ/mol. What is the MEAN C-H bond enthalpy?Read the answer and worked solution →As per your syllabus, the bond enthalpy of N≡N triple bond is which value — among the highest known for diatomics?Read the answer and worked solution →JEEMAIN · Chemistry · Spot the Error — Chemistry BasicsRead the answer and worked solution →How does metallic character change down a group?Read the answer and worked solution →Which one of the following elements exhibit maximum number of valence electrons?Read the answer and worked solution →Which of the following elements would lose an electron easily?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 →Spot the one that does not belongRead the answer and worked solution →Tap every statement true of the Schrodinger modelRead the answer and worked solution →

Worked practice questions

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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The bond order of the oxygen molecule O₂ (by molecular orbital theory) is

  1. 2
  2. 1
  3. 2.5
  4. 3
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Correct answer: A. 2

MO config gives bond order = (bonding − antibonding)/2 = (8−4)/2 = 2, consistent with the O=O double bond.

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As per your syllabus, in CH₄ atomisation requires 1665 kJ/mol. What is the MEAN C-H bond enthalpy?

  1. 416 kJ/mol (≈ 1665 / 4)
  2. 427 kJ/mol
  3. 100 kJ/mol
  4. 1665 kJ/mol
Show answer and solution

Correct answer: A. 416 kJ/mol (≈ 1665 / 4)

As per your syllabus, mean C-H = Δ_a H°/4 = 1665/4 ≈ 416 kJ/mol. Individual successive C-H bond dissociations differ (427, 439, 452, 347).

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