Start learning →

OJEE States of Matter — practice questions

Explore 67 free States of Matter questions in OJEE Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

Practise States of Matter with Quill →

States of Matter questions and exercises with answers

Showing questions 1–30 of 67.

The ideal gas equation of state is:Read the answer and worked solution →Boyle's law for a fixed amount of gas at constant temperature states that:Read the answer and worked solution →Charles's law for a fixed amount of gas at constant pressure states that:Read the answer and worked solution →The compressibility factor $Z$ of a gas is defined as $Z = \dfrac{PV}{nRT}$. For an ideal gas, $Z$ equals:Read the answer and worked solution →Above what temperature can a gas not be liquefied by pressure alone, no matter how much pressure is applied?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 →Which molecule is non-polar despite having polar bonds?Read the answer and worked solution →The bond order of the oxygen molecule O₂ (by molecular orbital theory) isRead the answer and worked solution →A coordinate (dative) bond differs from a normal covalent bond in thatRead the answer and worked solution →Which species has sp hybridisation on the central atom?Read the answer and worked solution →As bond order increases, bond lengthRead the answer and worked solution →An ionic bond forms byRead the answer and worked solution →The shape of NH₃ is pyramidal rather than planar becauseRead the answer and worked solution →Which has the highest dipole moment?Read the answer and worked solution →Among the following, which is paramagnetic?Read the answer and worked solution →Formal charge on an 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 →

Worked practice questions

The ideal gas equation of state is:

  1. $PV = RT$
  2. $PV = nRT$
  3. $P + V = nRT$
  4. $\dfrac{P}{V} = nRT$
Show answer and solution

Correct answer: B. $PV = nRT$

Ideal gas law: $PV = nRT$, where $P$ is pressure, $V$ is volume, $n$ is moles, $R$ is the universal gas constant ($8.314$ J/(mol·K) or $0.0821$ L·atm/(mol·K)), and $T$ is absolute temperature in Kelvin. This equation combines Boyle's law ($PV =$ const at fixed $T, n$), Charles's law ($V/T =$ const at fixed $P, n$), and Avogadro's hypothesis ($V/n =$ const at fixed $T, P$) into one statement.

Open this question →

Boyle's law for a fixed amount of gas at constant temperature states that:

  1. Pressure is directly proportional to volume
  2. $P^2 V = $ constant
  3. Pressure is inversely proportional to volume
  4. Volume is independent of pressure
Show answer and solution

Correct answer: C. Pressure is inversely proportional to volume

Boyle's law: at fixed $T$ and $n$, $PV = $ constant, so $P \propto 1/V$. Squeeze a gas into half the volume at constant temperature and its pressure doubles. The $P$-$V$ curve at fixed $T$ is a hyperbola called an isotherm. Option A is the opposite (direct proportion), which would mean compressing a gas reduces its pressure — physically absurd.

Open this question →

Charles's law for a fixed amount of gas at constant pressure states that:

  1. $V \propto T^2$
  2. $V$ is independent of $T$
  3. $V \propto T$ (Kelvin)
  4. $V \propto 1/T$
Show answer and solution

Correct answer: C. $V \propto T$ (Kelvin)

Charles's law: at fixed $P$ and $n$, volume is directly proportional to absolute temperature ($T$ in Kelvin): $V/T = $ constant. Double the Kelvin temperature, double the volume. The key subtlety is that $T$ must be in Kelvin, not Celsius — Charles's law fails badly if you use Celsius (a gas at $0°$C has nonzero volume). Graphically, $V$ vs $T$ (Kelvin) is a straight line passing through the origin.

Open this question →

How to practise

  1. Choose a States of Matter question and try to work out your answer.
  2. Open the question to check the correct answer and read its worked solution.
  3. Continue in the app for bite-sized lessons, explanations and review with Quill. You can start without creating an account.

More Chemistry topics

Ideal and Non-Ideal SolutionsIdeal SolutionsNon-Ideal SolutionsReactions in Aqueous SolutionElectrochemistryElectrochemical SeriesSolutionsCoordination Compounds