JEE Main 2023 · 13 Apr 2023 Shift 1

The energy of an electron in the first Bohr orbit of hydrogen atom is −2.18×10⁻¹⁸ J. Its energy in the third Bohr orbit is __________.

1. AOne third of this value
2. B1/9 th of this value
3. CThree times of this value
4. D1/27 of this value

In which of the following processes, the bond order increases and paramagnetic character changes to diamagnetic one?

1. ANO → NO⁺
2. BO₂ → O₂⁺
3. CO₂ → O₂²⁻
4. DN₂ → N₂⁺

What happens when a lyophilic sol is added to a lyophobic sol?

1. ALyophilic sol is dispersed in lyophobic sol.
2. BLyophobic sol is coagulated
3. CFilm of lyophilic sol is formed over lyophobic sol.
4. DFilm of lyophobic sol is formed over lyophilic sol.

Which of the following statements are not correct?

1. AThe electron gain enthalpy of F is more negative than that of Cl.
2. BIonization enthalpy decreases in a group of periodic table.
3. CThe electronegativity of an atom depends upon the atoms bonded to it.
4. DAl₂O₃ and NO are examples of amphoteric oxides. Choose the most appropriate answer from the options given below :

Which one of the following is most likely a mismatch ?

1. ATitanium - van Arkel Method
2. BNickel - Mond process
3. CZinc - Liquation
4. DCopper - Electrolysis

Given below are two statements : Statement I: Permutit process is more efficient compared to the synthetic resin method for the softening of water. Statement II: Synthetic resin method results in the formation of soluble sodium salts. In the light of the above statements, choose the most appropriate answer from the options given below:

1. ABoth the Statements I and II are correct
2. BBoth the Statements I and II are incorrect
3. CStatement I is correct but Statement II is incorrect
4. DStatement I is incorrect but Statement II is correct

Be(OH)₂ reacts with Sr(OH)₂ to yield an ionic salt. Choose the incorrect option related to this reaction from the following :

1. ABoth Sr and Be elements are present in the ionic salt.
2. BThe reaction is an example of acid - base neutralization reaction.
3. CThe element Be is present in the cationic part of the ionic salt.
4. DBe is tetrahedrally coordinated in the ionic salt.

ClF₅ at room temperature is a:

1. AColourless liquid with trigonal bipyramidal geometry
2. BColourless liquid with square pyramidal geometry
3. CColourless gas with square pyramidal geometry
4. DColourless gas with trigonal bipyramidal geometry.