Which of the following has highest second ionisation energy?
Show Hint
- Calcium
- Chromium
- Iron
- Cobalt
The Correct Option is B
Solution and Explanation
Ionization energy depends on electronic configuration stability.
Step 2: Analysis
The configuration of $Cr$ is $[Ar] 3d^{5} 4s^{1}$. After losing one electron, $Cr^{+}$ achieves the stable $[Ar] 3d^{5}$ (half-filled) configuration.
Step 3: Conclusion
Removing a second electron from this stable half-filled d-orbital requires very high energy.
Final Answer: (B)
Top MET Chemistry Questions
- In the oxidation of C\(_6\)H\(_5\)-CH\(_2\)-CH\(_3\) by KMnO\(_4\) the product formed is
- MET - 2019
- Chemistry
- Organic Reactions
- C\(_6\)H\(_6\) consists of one ring, while naphthalene consists of two rings. Both of them are aromatic and obey the (4n+2) rule. Thus the number of \(\pi\)-electrons inside rings of C\(_6\)H\(_6\) and naphthalene are respectively
- MET - 2019
- Chemistry
- Chemical bonding and molecular structure
- Acetyl salicylic acid is used as
- MET - 2019
- Chemistry
- Biomolecules
- In acid medium nitrobenzene is reduced to aniline as shown in the reaction C\(_6\)H\(_5\)-NO\(_2\) + 6[H] \(\rightarrow\) C\(_6\)H\(_5\)-NH\(_2\) + 2H\(_2\)O. The reducing agent used in this reaction is
- MET - 2019
- Chemistry
- Organic Reactions
- Among H—CHO, CH\(_3\)CHO and C\(_6\)H\(_5\)CHO, which will undergo Cannizzaro's reaction?
- MET - 2019
- Chemistry
- Organic Reactions
Top MET Atomic Structure Questions
- What is the general electronic configuration for 2nd row transition series?
- MET - 2019
- Chemistry
- Atomic Structure
- The magnetic quantum number for d-orbital is given by
- MET - 2019
- Chemistry
- Atomic Structure
- Which of the following is not true in Rutherford's nuclear model of atom?
- MET - 2019
- Chemistry
- Atomic Structure
- All the s-block elements of the periodic table are placed in the groups ....
- MET - 2019
- Chemistry
- Atomic Structure
- Which of the following has highest second ionisation energy?
- MET - 2019
- Chemistry
- Atomic Structure
Top MET Questions
- Radiation, with wavelength 6561 $?$ falls on a metal surface to produce photoelectrons. The electrons are made to enter a uniform magnetic field of $3 \times 10^{-4} T$. If the radius of the largest circular path followed by the electrons is 10 mm, the work function of the metal is close to :
- MET - 2020
- Photoelectric Effect
- If \(f(x) = \begin{cases} x, & 0 \le x \le 1 \\ 2x - 1, & 1<x \end{cases}\), then
- MET - 2019
- Continuity
Helicopters are very different from airplanes. They can do three things that airplanes cannot do. First, when airplanes move upward, they must also move forward, but helicopters can move straight up without moving ahead. Second, helicopters can fly backward, which airplanes cannot do. Third, helicopters can use their rotors to hover in the air, which is impossible for airplanes. Helicopters can perform actions that airplanes cannot, they are used for different tasks. Since, helicopters can take off without moving forward, they do not need a runway for take off. They are used in congested areas where there is no room for airplanes or in isolated areas, which do not have airports. Because they can hover, they are used on firefighting missions to drop water on fires. They are used in logging operations to lift trees out of forests. Helicopters are used as air ambulances to airlift patients out of situations, which are difficult to reach by conventional ambulances. The police used helicopters to follow suspects on the ground or to search for cars on the ground. Of course, helicopters have military uses because of their design and capabilities.
- MET - 2019
- Reading Comprehension
- Find the missing character.
- MET - 2019
- Number Patterns
- 6, 9, 12, 15, 18, ?
- MET - 2019
- Number Patterns