JEE Main entrance exam Question Bank Solutions for Chemistry (JEE Main)

Al₂O₃ was leached with alkali to get X. The solution of X on passing of gas Y forms Z. X, Y and Z respectively are:

Match List-I with List-II:

Choose the correct answer from the options given below:

Given below are two statements:

Statements I: According to Bohr's model of an atom, qualitatively the magnitude of velocity of electron increases with decrease in positive charges on the nucleus as there is no strong hold on the electron by the nucleus.

Statement II: According to Bohr's model of an atom, qualitatively the magnitude of velocity of electron increase with a decrease in principal quantum number.
In light of the above statements, choose the most appropriate answer from the options given below:

While titration dilute HCl solution with aqueous NaOH, which of the following will not be required?

The size of iso-electronic species Cl^-, Ar and Ca²⁺ is affected by ______.

The wavelength in Å of the photon that is emitted when an electron in Bohr orbit with n = 2 returns to orbit with n = 1 in H atom is ______ Å. The ionisation potential of the ground state of the H-atom is 2.17 × 10⁻¹¹ erg.

Benzoic acid gives benzene on being heated with X and phenol gives benzene on being heated with Y. Therefore X and Y are respectively:

The number of times larger the spacing between the energy levels with n = 3 and n = 8 spacing between the energy level with n = 8 and n = 9 for the hydrogen atom is ______.

The first ionization energy of H is 21.79 × 10^-19 J. The second ionization energy of He atom is ______ × 10^-19J.

The line at 434 nm in the Balmer series of the hydrogen spectrum corresponds to a transition of an electron from the n^th to second Bohr orbit. The value of n is ______.

The monomer of PMMA is ______.

If liquids A and B form an ideal solution, the ______.

For a reaction, given below is the graph of ln k vs `1/"T"`. The activation energy for the reaction is equal to ______ cal mol^-1. (Nearest integer) (Given : R = 2 cal K^-1 mol^-1)

Which one of the following statements is not true about enzymes?

Which of the following chemical reactions represents Hall- Heroult Process?

The purest form of commercial iron is ______.

Which of the following is the most stable carbocation?

Among the following statements on the nitration of aromatic compounds, the false statement is:

The energy of an electron in the first Bohr orbit of the H-atom is −13.6 eV. The energy value of an electron in the excited state of Li²⁺ is ______.

Which one of the following has the largest ionic radius?