List of top Chemistry Questions

The conductivity of a 0.2 M solution of KCl is \( 2.48 \times 10^{-2} \) S cm\(^{-1}\). Calculate its molar conductivity and degree of dissociation (\( \alpha \)).
Given: \( \lambda^0_{\text{K}^+} = 73.5 \, \text{S cm}^2 \text{mol}^{-1} \), \( \lambda^0_{\text{Cl}^-} = 76.5 \, \text{S cm}^2 \text{mol}^{-1} \)

Identify the correct order of organic compounds in the following chemical reaction:

(A) CH₃MgBr
(B) CH₃Br
(C) CH₃Cl
(D) CH₄
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Match List-I with List-II:

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Which metal is the most powerful reducing agent in aqueous solution?

Which of the following ions will be coloured in the aqueous solution?
(A) Ti³⁺
(B) Nb³⁺
(C) Cu⁺
(D) Y³⁺
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Although chlorine is electron-withdrawing, it is ortho- and para-directing in electrophilic substitution because • (A) Chlorine withdraws electrons through inductive effect.
(B) Chlorine destabilizes the intermediate carbocation formed during electrophilic sub-stitution.
(C) Chlorine accepts electrons through resonance
(D) Chlorine releases electrons through resonance.
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Vapour pressures of pure liquids 'A' and 'D' are 500 mm Hg and 800 mm Hg, respectively.The binary solution of ’A’ and ’D’ boils at 50◦C and 700 mm Hg pressure.The mole percentage of D in the solution is:

What will be the change in acidity if:
(i) CuSO₄ is added to saturated (NH₄)₂SO₄ solution,
(ii) SbF₅ is added to anhydrous HF?

If 75$\%$ of a first-order reaction gets completed in 32 minutes, the time taken for 50$\%$ completion of this reaction is:

The spin-only magnetic moment of Hexacyanomanganate(II) ion is.........BM

A photon of wavelength \( 3000 \) Å strikes a metal surface. The work function of the metal is \( 2.13 \) eV. What is the kinetic energy of the emitted photoelectron? (\( h = 6.626 \times 10^{-34} \) Js)

In the following sequence of reactions, \[ CH_3Br \xrightarrow{KCN} X \xrightarrow{H_3O^+} Y \xrightarrow{LiAlH_4 / \text{ether}} Z \] The final product \(Z\) is:

The ratio of solubility of AgCl in 0.1 M KCl solution to the solubility of AgCl in water is:
(Given: Solubility product of AgCl = 10⁻¹⁰)

What is the numerical value of one Faraday in Coulombs?

What are the possible values of magnetic quantum number for $p$ orbital?

Identify 'A' in the following reaction.

Identify the reagent 'R' necessary to bring the following conversion.

Which amino acid from following contains highest number of N atoms in it?

What is the IUPAC name of following compound?

If osmotic pressure of $0.2 \text{ M}$ aqueous glucose solution is $5 \text{ atm}$ at $300 \text{ K}$. Calculate the concentration of glucose solution having osmotic pressure $2.5 \text{ atm}$ at same temperature.

Calculate the final pressure required to reduce the volume of a gas to one third, if initial pressure is $1.6 \times 10^5 \text{ Nm}^{-2}$.

What is the change in internal energy for $2\text{CO}_{(g)} + \text{O}_{2(g)} \rightarrow 2\text{CO}_{2(g)}$ at $25^\circ\text{C}$ ?
( $\text{R} = 8.314 \text{ J K}^{-1} \text{ mol}^{-1}$, $\Delta H = -560 \text{ kJ}$ )}

If A, B, C, D are four different elements with outer electronic configuration as
A = $4s^2 4p^4$, B = $4s^2 4p^5$, C = $5s^2 5p^4$, D = $5s^2 5p^5$.
Find the element having highest ionization enthalpy ($\Delta_i H_1$)

Which of the following isomeric amines has the highest boiling point?