COMEDK · Chemistry · 3. Classification of Elements and Periodicity in Properties
The correct decreasing order of negative electron gain enthalpy for \(\mathrm{C}, \mathrm{Ca}, \mathrm{Al}, \mathrm{F}\) and \(\mathrm{O}\) is
- A \(\mathrm{F}>\mathrm{O}>\mathrm{C}>\mathrm{Al}>\mathrm{Ca}\)
- B \(\mathrm{Ca}>\mathrm{Al}>\mathrm{O}>\mathrm{F}>\mathrm{C}\)
- C \(\mathrm{Al}>\mathrm{F}>\mathrm{Ca}>\mathrm{C}>\mathrm{O}\)
- D \(\mathrm{F}>\mathrm{C}>\mathrm{O}>\mathrm{Ca}>\mathrm{Al}\)
Answer & Solution
Correct Answer
(A) \(\mathrm{F}>\mathrm{O}>\mathrm{C}>\mathrm{Al}>\mathrm{Ca}\)
Step-by-step Solution
Detailed explanation
Electron gain enthalpy becomes less negative as we move down in a group white it becomes more negative along the period. \(\therefore\) Correct order is \(\mathrm{F}>\mathrm{O}>\mathrm{C}>\mathrm{Al}>\mathrm{Ca}\)
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Chemistry
- Which of the following compounds undergo Aldol condensation followed by dehydration to give 3-phenylprop-2-en-1-al?COMEDK 2024 Medium
- What would be the cell potential for the Galvanic cell which is represented by the electrochemical reaction:
\(\begin{aligned}
& 2 \mathrm{Cr}_{(\mathrm{S})}+3 \mathrm{Fe}^{2+}(0.02 \mathrm{M}) \rightarrow 2 \mathrm{Cr}^{3+}(0.2 \mathrm{M})+3 \mathrm{Fe} \\
& \mathrm{E}^0 \mathrm{Fe}^{2+} / \mathrm{Fe}=-0.42 \mathrm{~V} \quad \mathrm{E}^0 \mathrm{Cr}^{3+} / \mathrm{Cr}=-0.72 \mathrm{~V}
\end{aligned}\)COMEDK 2025 Medium - Given below are 4 molecular species/ions. Identify the species/ion which exhibits diamagnetic nature.
\([\mathrm{A}]=\mathrm{N}_2^{+} \quad[\mathrm{B}]=\mathrm{O}_2^{-} \quad[\mathrm{C}]=\mathrm{B}_2 \quad[\mathrm{D}]=\mathrm{C}_2\)COMEDK 2024 Medium - Identify the correct statementCOMEDK 2026 Medium
- The bond dissociation enthalpy of the species in their correct order is:COMEDK 2024 Medium
- In a \(0.2 \mathrm{~M}\) aqueous solution, lactic acid is \(6.9 \%\) dissociated. The value of dissociation constant isCOMEDK 2023 Medium
More PYQs from COMEDK
- Two protons are kept at a separation of \(40 Å . F_{n}\) is the nuclear force and \(F_{e}\) is the electrostatic force between them. Then,COMEDK 2018 Easy
- A beam of parallel rays is brought to a focus by a plano-convex lens. A thin concave lens of the same focal length is joined to the first lens. The effect of this isCOMEDK 2019 Medium
- The first ionisation enthalpy of Al in \(\mathrm{kJ} \mathrm{mol}^{-1}\) is:
[Given the first ionisation enthalpy of \(\mathrm{Na}, \mathrm{Mg}\) and Si in \(\mathrm{kJ} \mathrm{mol}^{-1}\) are 497, 738 and 787 respectively]COMEDK 2025 Medium - Two statements, one Assertion (A) and the other Reason (R) are given. Choose the correct option.
Assertion: Maltose, a disaccharide, is a reducing sugar and is obtained by the partial hydrolysis of starch in presence of the enzyme diastase.
Reason: Hydrolysis of one mole of Maltose gives one mole each of \(\alpha-\mathrm{D}-\) Glucose and \(\beta-\) D-Fructose.COMEDK 2025 Medium - \(\int \dfrac{e^{\log\left(1+\frac{1}{x^2}\right)}}{x^2 + \dfrac{1}{x^2}}\ dx =\)COMEDK 2026 Medium
- If the circles \(x^{2}+y^{2}+2 g x+2 f y=0\) and \(x^{2}+y^{2}+2 g^{\prime} x+2 f^{\prime} y=0\) touch each other, thenCOMEDK 2018 Medium