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

For octahedral Mn(II) and tetrahedral Ni(II) complexes, consider the following statements:

1. Both the complexes can be high spin.
2. Ni(II) complex can very rarely below spin.
3. With strong field Ligands, Mn(II) complexes can be low spin.
4. Aqueous solution of Mn (II) ions is yellow in colour.

The correct statements are:

The major product in the following reaction is:

Consider that d⁶ metal ion (M²⁺) forms a complex with aqua ligands and the spin only magnetic moment of the complex is 4.90 BM. The geometry and the crystal field stabilization energy of the complex are ______.

The acceptable resonating structures of the following molecule are:

\[\begin{array}{cc}
\ce{CH3 - CH = C - \overset{\bullet\bullet}{\underset{\bullet\bullet}{O}} - CH2 - CH3}\\
|\phantom{......}\\
\ce{:N}\phantom{.......}\\
\phantom{}/\phantom{...}\backslash\phantom{......}\\
\phantom{}\ce{H3C}\phantom{.....}\ce{CH3}\phantom{......}
\end{array}\]

Isocyanide reaction involves the intermediate formation of ______.

For the gaseous reaction, \[\ce{K_{(g)} + F_{(g)} -> K^+_{ (g)} + F^-_{ (g)}}\], ΔH was calculated to be 19 kcal/mol under conditions where the cations and anions were prevented by electrostatic separation from combining with each other. The ionisation energy of K is 4.3 eV. The electron affinity of F is ______. (in eV)

The lassaigne's extract is boiled with dil. HNO₃ before testing for halogens because ______.

If the starting material is 1-methyl-1,2-epoxy cyclopentane, of absolute configuration, decide which one compound correctly represents the product of its reaction with sodium methoxide in methanol.

`"A"_0/2` atoms of X(g) are converted into X⁺(g) by absorbing energy E₁. `"A"_0/2` ions of X⁺(g) are converted into X⁻(g) with release of energy E₂. Hence ionization energy and electron affinity of X(g) are ______.

What happens when steam is passed over red-hot carbon?

The decreasing order of the second ionization potential of K, Ca and Ba is ______.

The presence of primary amines can be confirmed by ______.

\[\ce{(A) ->[Cl2/hv] (B) ->[aq. KOH] (C) ->[O] CH3CHO}\]

Identify A, B and C:

The vapour pressures of two volatile liquids A and B at 25°C are 50 Torr and 100 Torr, respectively. If the liquid mixture contains 0.3 mole fraction of A, then the mole fraction of liquid B in the vapour phase is `x/17`. The value of x is ______.

Galvanization is applying a coating of ______.

What are A and B in the following reaction?

Major product of the reaction is:

Which of the following atoms has the highest first ionization energy?

The complex that has highest crystal field splitting energy (Δ) is ______.

Which of the following is not a correct statement for primary aliphatic amines?