AP EAMCET · Chemistry · Classification of Elements and Periodicity in Properties
Calculate the energy required to convert all atoms in \(4.8 \mathrm{~g}\) of \(\mathrm{Mg}\) to \(\mathrm{Mg}^{2+}\) in the vapour state. \(\mathrm{IE}_1\) and \(\mathrm{IE}_2\) of \(\mathrm{Mg}\) are \(740 \mathrm{~kJ} / \mathrm{mol}\) and \(1450 \mathrm{~kJ} / \mathrm{mol}\) respectively.
- A \(+740 \mathrm{~kJ} / \mathrm{mol}\)
- B \(-740 \mathrm{~kJ} / \mathrm{mol}\)
- C \(-1450 \mathrm{~kJ} / \mathrm{mol}\)
- D \(+438 \mathrm{~kJ} / \mathrm{mol}\)
Answer & Solution
Correct Answer
(D) \(+438 \mathrm{~kJ} / \mathrm{mol}\)
Step-by-step Solution
Detailed explanation
For 1 mole of \(\left(\mathrm{Mg} \longrightarrow \mathrm{Mg}^{2+}\right)\) \(\mathrm{IE}=\mathbb{E E}_1+\mathrm{IE}_2=(740+1450)=2190 \mathrm{~kJ} / \mathrm{mol}\). Number of mole in \(4.8 \mathrm{~g}\) of \(\mathrm{Mg}=4.8 / 24=0.2 \mathrm{~mol}\) For 1 mole energy required…
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
- Match the following.
\begin{array}{|c|c|c|c|}
\hline & List I (Substance) & & List II (Use) \\
\hline (A) & Methanoic acid & (i) & Textile \\
\hline (B) & Ethanoic acid & (ii) & Polymer \\
\hline (C) & Hexanedioic acid & (iii) & Food preservative \\
\hline (D) & Sodium benzoate & (iv) & Vinegar \\
\hline
\end{array}AP EAMCET 2022 Easy - For a reaction \(2 \mathrm{CO}(\mathrm{g})+\mathrm{O}_2(\mathrm{~g}) \rightleftharpoons 2 \mathrm{CO}_2(\mathrm{~g})\), \(\Delta_{\mathrm{r}} \mathrm{G}^0=-128 \mathrm{~kJ}\) at \(300 \mathrm{~K}\). If \(\Delta_{\mathrm{r}} \mathrm{S}^0\) of the reaction is \(-40 \mathrm{~J} \mathrm{~K}^{-1}\), calculate \(\Delta_{\mathrm{r}} \mathrm{U}\) of the reaction.AP EAMCET 2022 Medium
- The different types of bonds present in \(\mathrm{CuSO}_4 \cdot 5 \mathrm{H}_2 \mathrm{O}\) areAP EAMCET 2021 Easy
- Consider the following
Statement-I : If thermal energy is stronger than intermolecular forces, the substance prefers to be in gaseous state.
Statement-II : At constant temperature, the density of an ideal gas is proportional to its pressure.
The correct answer isAP EAMCET 2025 Medium - The reaction of 1-bromohexane with aqueous \(\mathrm{NaOH}\) solution follows the orderAP EAMCET 2022 Easy
- A mixture of three compounds \(A, B, C\) is passed through a column of \(\mathrm{Al}_2 \mathrm{O}_3\) by using alcohol as eluant. The order in which they are eluted out of the column is \(C, B, A\). Which of the following statement is true?AP EAMCET 2020 Easy
More PYQs from AP EAMCET
- If the equation of the pair of straight lines passing through the point \((1,1)\) and perpendicular to the pair of lines \(3 \mathrm{x}^2\) \(+11 x y-4 y^2=0\) is \(\mathrm{a}^2+2 \mathrm{~h} x y+\mathrm{b} y^2+2 \mathrm{~g} x+2 \mathrm{f} y+12=0\), then \(2(a-h+b-g+f-12)=\)AP EAMCET 2024 Medium
- Let \(\mathrm{f}: \mathbb{R} \rightarrow \mathbb{R}\) be a continuous function. If \(\mathrm{px}+\mathrm{my}+\mathrm{n}=0\) is a tangent drawn to the curve \(y=f(x)\) at \(x=\alpha\), then at \(x\) \(=0, \frac{d}{d x}\left(f\left(\alpha e^{2 x}\right)\right)=\)AP EAMCET 2023 Medium
- If \(f(x)\left\{\begin{array}{cc}\frac{x-1}{2 x^2-7 x+5}, & \text { for } x \neq 1 \\ -\frac{1}{3} & , \text { for } x=1\end{array}\right.\), then \(f^{\prime}(1)\) is equal to :AP EAMCET 2003 Medium
- If \({ }^n P_4=1680\), then \(n=\)AP EAMCET 2020 Easy
- Let \(B=\left(\begin{array}{ccc}2 & 6 & 4 \\ 1 & 0 & 1 \\ -1 & 1 & -1\end{array}\right)\) and \(C=\left(\begin{array}{ccc}-1 & 0 & 1 \\ 1 & 1 & 3 \\ 2 & 0 & 2\end{array}\right)\)
If a matrix \(A\) is such that \(\mathrm{BAC}=\mathrm{I}\), then \(\mathrm{A}^{-1}=\)AP EAMCET 2023 Easy - If the product of the roots of the equation \(x^2+4 k x+12 e^{3 \log k}-1=0,(k>0)\) is 323 , then the sum of its roots isAP EAMCET 2019 Easy