MHT CET · Chemistry · Classification of Elements and Periodicity in Properties
What is the total number of unpaired electrons in an element placed at period-4 and group-12 either in excited or at ground state?
- A Zero
- B One
- C Two
- D Three
Answer & Solution
Correct Answer
(A) Zero
Step-by-step Solution
Detailed explanation
Zn belongs to period 4 and group 12 of the periodic table.
\(\begin{aligned}
& \mathrm{Zn}(\text { ground state })=[\mathrm{Ar}] 3 \mathrm{~d}^{10} 4 \mathrm{~s}^2 \\
& \mathrm{Zn}^{2+}(\text { excited state })=[\mathrm{Ar}] 3 \mathrm{~d}^{10}
\end{aligned}\)
\(\begin{aligned}
& \mathrm{Zn}(\text { ground state })=[\mathrm{Ar}] 3 \mathrm{~d}^{10} 4 \mathrm{~s}^2 \\
& \mathrm{Zn}^{2+}(\text { excited state })=[\mathrm{Ar}] 3 \mathrm{~d}^{10}
\end{aligned}\)
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
- According to Andrews isothermals at what temperature the carbondioxide gas starts to condense at 73 atmosphere?MHT CET 2020 Easy
- For the reaction, \(3 \mathrm{I}_{(\mathrm{aq})}^{-}+\mathrm{S}_2 \mathrm{O}_{8(\mathrm{aq})}^{2-} \longrightarrow \mathrm{I}_{3(\mathrm{aq})}^{-}+2 \mathrm{SO}_{4(\mathrm{aq})}^{2-}\), rate of formation of \(\mathrm{SO}_4^{2-}\) is \(0.022 \mathrm{~mol} \mathrm{dm}^{-3} \mathrm{sec}^{-1}\). What is rate formation of \(\mathrm{I}_{3(\mathrm{aq})}^{-}\)?MHT CET 2021 Medium
- Which among the following salt solution in water shows \(\mathrm{pH}\) less than 7 ?MHT CET 2021 Easy
- What is the range of number of carbon atoms in alkanes found in paraffin wax?MHT CET 2020 Easy
- Which of following elements does not react with hot concentrated sulphuric acid?MHT CET 2019 Easy
- Which among the following formulae represents glycollic acidMHT CET 2020 Easy
More PYQs from MHT CET
- In Young's double slit interference experiment, using two coherent sources of different amplitudes, the intensity ratio between bright to dark fringes is \(5: 1\). The value of the ratio of resultant amplitudes of bright fringe to dark fringe isMHT CET 2025 Medium
- \(\quad \int 3^{3^x} \cdot 3^x d x=\)MHT CET 2024 Easy
- Which among the following statements is true for conductivity?MHT CET 2021 Medium
- For a metallic wire, the ratio of voltage to corresponding current isMHT CET 2019 Easy
- If \(\mathrm{f}(x)=3 \mathrm{x}+10, \mathrm{~g}(x)=x^2-1\), then \((\mathrm{fog})^{-1}(x)=\)MHT CET 2025 Medium
- Match the enzyme involved in Krebs cycle given in column-I with the reactions they catalyse given in column-II. Choose the correct option.
Column I Column II i. Isocitrate dehydrogenase a. Citrate → Cisaconitate ii. Fumarase b. Succinate → Fumarate iii. Aconitase c. Fumarate → Malate Iv. Succinate dehydrogenase d. Isocitrate → Oxalosuccinic acid MHT CET 2023 Easy