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

Enthalpy for the reaction \[\ce{Ag^+ (aq) + Br^- (aq) -> AgBr(s)}\] is −84.54 kJ. Magnitude of enthalpy of formation of Ag⁺ (aq) and Br⁻ (aq) are in the ratio 8 : 9. Formation of Ag⁺ (aq) is an endothermic process whereas formation of Br⁻ (aq) is an exothermic process. Enthalpy of formation of AgBr is −99.54 kJ/mol. The enthalpy of formation of Ag⁺ (aq) is ______ kJ/mol.

Two pi and half sigma bonds are present in ______.

Aniline dissolved in dilute HCl is reacted with sodium nitrate at 0 °C. This solution was added dropwise to a solution containing equimolar mixture of aniline and phenol in dil. HCl. The structure of the major product is:

Hydrogen peroxide, in its pure state, is ______.

Which one of the following class of compounds is obtained by polymerization of acetylene?

A box contains 0.90 g of liquid water in equilibrium with water vapour at 27°C. The equilibrium vapour pressure of water at 27°C is 32.0 Torr. When the volume of the box is increased, some of the liquid water evaporates to maintain the equilibrium pressure. If the liquid water evaporates, then the volume of the box must be - litre (nearest integer) R = 0.0821 L atm K^-1 mol^-1.
(Ignore the volume of the liquid water and assume water vapours behave as an ideal gas)

For the reaction given below:

\[\ce{COCl3 x NH3 + AgNO3(ag) ->}\]

If two equivalents of AgCl precipitate out, then the value of x will be ______.

The Azimuthal quantum number for the valence electrons of Ga⁺ ion is ______. (Atomic number of Ga = 31)

AB₂ is 10% dissociated in water to A²⁺ and B⁻. The boiling point of a 10.0 molal aqueous solution of AB₂ is ______°C. (Round off to the Nearest Integer).

[Given: Molal elevation constant of water K_b = 0.5 K kg mol⁻¹ boiling point of pure water = 100°C]

Which of the following graphs is not correct for ideal gas?

The order of stability of the following resonating structures is:

\[\begin{array}{cc}
\phantom{.........}\ce{O}\\
\phantom{.........}||\\
\ce{\underset{(I)}{CH2 = CH - C - H}}
\end{array}\]

\[\begin{array}{cc}
\phantom{.........}\ce{\overset{⊕}{O}}\\
\phantom{.........}|\\
\ce{\underset{(II)}{\overset{⊕}{C}H2 - CH = C - H}}
\end{array}\]

\[\begin{array}{cc}
\phantom{.........}\ce{\overset{⊕}{O}}\\
\phantom{.........}|\\
\ce{\underset{(III)}{\overset{Θ}{C}H2 - CH = C - H}}
\end{array}\]

H₂O₂ can be obtained when the following reacts with H₂SO₄ except with:

A jar contains a gas and a few drops of water at T K. The pressure in the jar is 830 mm of Hg. The temperature of the jar is reduced by 1%. The vapour pressure of water at two temperatures are 30 and 25 mm of Hg. The new pressure in the jar is ______ mm of Hg.

The molar heat of formation of NH₄NO₃ (s) is −367.54 kJ and those of N₂O (g), H₂O (l) are 81.46 and −285.8 kJ respectively at 25°C and atmosphere pressure. The difference of ΔH and ΔE of the reaction \[\ce{NH4NO3(s) -> N2O (g) + 2H2O (l)}\] is ______ kJ.

The quantum number of four electrons are given below:

1. n = 4, l = 2, m₁ = - 2, m_s = `- 1/2`
2. n = 3, l = 2, m₁ = 1, m_s = `+ 1/2`
3. n = 4, l = 1, m₁ = 0, m_s = `+ 1/2`
4. n = 3, l = 1, m₁ = 1, m_s = `- 1/2`

The correct order of their increasing energies will be:

The IUPAC name of the following compound is:

\[\begin{array}{cc}
\ce{CH3}\phantom{..}\ce{OH}\phantom{.........}\\
|\phantom{......}|\phantom{...........}\\
\ce{CH3 - CH - CH - CH2 - COOH}\\
\end{array}\]

Which of the following is not correct?

The volume of '10 Vol' of H₂O₂ required to liberate 500 mL O₂ at NTP is ______.

A cylinder of gas supplied by Bharat Petroleum is assumed to contain 14 kg of butane. If a normal family requires 20,000 kJ of energy per day for cooking, butane gas in the cylinder last for ______ Days. (Δ H_c of C₄ H₁₀ = - 2658 JK per mole)

Boiling point of a 2% aqueous solution of a non-volatile solute A is equal to the boiling point of 8% aqueous solution of a non-volatile solute B. The relation between molecular weights of A and B is ______.