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UPCET / UPSEE Surface Chemistry — practice questions

Explore 106 free Surface Chemistry questions in UPCET / UPSEE Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Surface Chemistry questions and exercises with answers

Showing questions 1–30 of 106.

The modern periodic law states that the physical and chemical properties of elements are periodic functions of:Read the answer and worked solution →Elements of the modern periodic table are classified into how many blocks based on the differentiating electron?Read the answer and worked solution →Across a period from left to right, the atomic radius generally:Read the answer and worked solution →Which element has the highest first ionization energy in period 2?Read the answer and worked solution →Which of the following arrangements is in correct order of increasing electronegativity (Pauling scale)?Read the answer and worked solution →The element with electronic configuration $1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^3$ belongs to which group and period?Read the answer and worked solution →Solutions are homogeneous mixtures of two or more components. In a binary solution, the component present in the largest quantity is termed the:Read the answer and worked solution →An amalgam of mercury with sodium is an example of which type of solution?Read the answer and worked solution →Which of the following concentration units is *temperature-dependent*?Read the answer and worked solution →The sum of mole fractions of all components in a solution equals:Read the answer and worked solution →Molality (m) is defined as:Read the answer and worked solution →Calculate the molality of a solution prepared by dissolving 2.5 g of ethanoic acid (CH₃COOH, M = 60 g mol⁻¹) in 75 g of benzene.Read the answer and worked solution →The molarity of a solution containing 5 g of NaOH (M = 40 g mol⁻¹) in 450 mL of solution is:Read the answer and worked solution →The mole fraction of ethylene glycol (C₂H₆O₂, M = 62) in a 20% by mass aqueous solution is approximately:Read the answer and worked solution →If sea water (density 1.03 g mL⁻¹) contains 5.8 g of dissolved O₂ per 10⁶ g of water, the concentration is best expressed as:Read the answer and worked solution →'Like dissolves like' implies that:Read the answer and worked solution →If dissolution of a solid in a liquid is endothermic (Δ_sol H > 0), the solubility will:Read the answer and worked solution →Solubility of gases in liquids generally:Read the answer and worked solution →To increase the solubility of CO₂ in soft drinks, manufacturers:Read the answer and worked solution →Raoult's law for a solution of two volatile liquids states that the partial pressure of component 1 is:Read the answer and worked solution →For a binary solution of volatile liquids, the total vapour pressure can be written as:Read the answer and worked solution →Raoult's law in its general form, for the solvent in a solution of a non-volatile solute, gives the relative lowering of vapour pressure as:Read the answer and worked solution →For an ideal solution, both the enthalpy of mixing and the volume of mixing are:Read the answer and worked solution →Which of the following is an example of a near-ideal solution?Read the answer and worked solution →Solutions showing large **positive deviation** from Raoult's law form which type of azeotrope?Read the answer and worked solution →Ethanol–water mixture, on fractional distillation, gives an azeotrope at approximately:Read the answer and worked solution →HNO₃–water mixture forms a *maximum* boiling azeotrope at composition:Read the answer and worked solution →Which of the following is NOT a colligative property?Read the answer and worked solution →The four colligative properties all originate from:Read the answer and worked solution →Elevation of boiling point (ΔT_b) is related to molality (m) by:Read the answer and worked solution →

Worked practice questions

The modern periodic law states that the physical and chemical properties of elements are periodic functions of:

  1. Atomic mass
  2. Atomic radius
  3. Atomic number
  4. Number of neutrons
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Correct answer: C. Atomic number

Modern (Moseley's) periodic law: properties of elements are periodic functions of their **atomic number** ($Z$). This replaced Mendeleev's original law which was based on atomic mass. Why atomic number wins: it explains chemistry better (electronic structure follows $Z$, not mass) and resolves Mendeleev's anomalies (the Ar/K and Te/I pairs whose mass-order disagrees with chemistry-order).

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Elements of the modern periodic table are classified into how many blocks based on the differentiating electron?

  1. 2 (s and p)
  2. 4 (s, p, d, f)
  3. 3 (s, p, d)
  4. 5 (s, p, d, f, g)
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Correct answer: B. 4 (s, p, d, f)

**Four blocks** based on which subshell the differentiating electron enters: - **s-block**: Groups 1 and 2 (Li, Na, K, Be, Mg, Ca, etc.) - **p-block**: Groups 13 to 18 (B, C, N, O, F, halogens, noble gases) - **d-block**: Groups 3 to 12 (transition metals) - **f-block**: Lanthanides and actinides (separated below the main table) No g-block has been confirmed experimentally yet, though it's predicted for superheavy elements ($Z > 120$).

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Across a period from left to right, the atomic radius generally:

  1. Decreases
  2. Remains constant
  3. Increases
  4. First increases then decreases
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Correct answer: A. Decreases

Atomic radius **decreases** from left to right across a period. Why: nuclear charge ($Z$) increases by 1 as you move right, pulling electrons closer. The added electron enters the same shell so screening barely increases — the net effect is stronger attraction and smaller radius. Across period 2: Li (152 pm) → Be → B → C → N → O → F (72 pm). Roughly halves. Down a group, atomic radius *increases* (electrons go into higher principal shells, further from nucleus).

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More Chemistry topics

Ideal and Non-Ideal SolutionsIdeal SolutionsNon-Ideal SolutionsReactions in Aqueous SolutionElectrochemistryElectrochemical SeriesCoordination CompoundsSolutions