List of top Chemistry Questions

Identify the complex which exhibits all 3 characteristics: paramagnetic; high spin configuration; octahedral geometry.

Choose the incorrect statement.

Which one of the following complex-isomerism pair matches correctly?

Which of the following is an INCORRECT match?

An unsaturated organic compound ($\text{C}_3\text{H}_6$), undergoes the following series of reactions: $\text{C}_3\text{H}_6$ $\xrightarrow{\text{dil. H}_2\text{SO}_4}$ [B] $\xrightarrow{\text{+HCl/ZnCl}_2}$ [C] $\xrightarrow{\text{Na / dry ether}}$ [D] (Major Product)} Identify compound [D].

A first order reaction is 50% complete in 30 minutes at 300 K and in 10 minutes at 320 K. The activation energy of the reaction ($E_a$) is: [R = 314 J K$^{-1}$ mol$^{-1}$, log 2 = 3010; log 3 = 4771]

The quantity of $\text{Ca}$ that can be produced from molten $\text{CaCl}_2$, with the same quantity of electricity (in coulombs) required to produce $8\text{ g}$ of $\text{Mg}$ from molten $\text{MgCl}_2$ is: [Atomic mass of $\text{Mg} = 24\text{ u}$; Atomic mass of $\text{Ca} = 40\text{ u}$]}

Identify the INCORRECT statement.

x moles of $\text{K}_2\text{Cr}_2\text{O}_7$ oxidises 1 mole of ferrous oxalate, in acidic medium. Hence 'x' is:

What is the major product [P3] formed when n-Hexane undergoes the given series of reactions?

n-Hexane $\xrightarrow[\text{20 atm, 773 K}]{\text{V}_2\text{O}_5}$ [P] $\xrightarrow[\Delta]{\text{C}_2\text{H}_5\text{Cl, Anhyd. AlCl}_3}$ [P2] $\xrightarrow[\text{333 K}]{\text{Conc. HNO}_3 + \text{H}_2\text{SO}_4}$ [P3]}

The $\Delta G^\circ$ for the reaction, $\text{Cd}^{2+}(aq) + \text{Zn}(s) \rightarrow \text{Zn}^{2+}(aq) + \text{Cd}(s)$ is: (Given $E_{\text{Cd}^{2+}/\text{Cd}}^\circ = -403\text{ V}$, $E_{\text{Zn}^{2+}/\text{Zn}}^\circ = -763\text{ V}$)}

What is the major product [Z] formed when compound [C] undergoes the following reactions?

[C] (Cyclohexyl bromide) $\xrightarrow[\Delta]{\text{alc. KOH}$ [X] $\xrightarrow{\text{HCl}}$ [Y] $\xrightarrow{\text{(i) alc. KCN, (ii) dil. HCl}}$ [Z]}

Choose the incorrect statement.

Among the given resonating structures of molecules negative mesomeric effect is represented by:

In the synthesis of $\text{NH}_3$ from $\text{H}_2$ and $\text{N}_2$ if $6\times10^{-2}$ mole of hydrogen disappears in 10 minutes, the number of moles of $\text{NH}_3$ formed in 3 minutes is:

When a metal of work function $4\text{ eV}$ is exposed to radiation, the maximum kinetic energy of the emitted electrons is $4\text{ eV}$. The stopping potential required is:

The basic principle behind the working of an electron microscope is:

A hydrogen atom absorbs energy and rises to the $n = 3$ state from its ground state $n = 1$. If the potential energy of the atom at its ground state is $-22\text{ eV}$, find the wavelength emitted by it when it returns to its ground state: (Take Planck's constant $= 6 \times 10^{-34}\text{ J s}$, speed of light $= 3 \times 10^8\text{ m s}^{-1}$)}

The variation of the stopping potential ($V_0$) with the frequency of incident radiation ($\nu$) is plotted. If $\nu_0$ is the threshold frequency, $h$ is Planck's constant, and $e$ is the electronic charge, then the slope of the graph with the frequency axis is:

Calculate the vapour pressure that can help the formation of a spherical droplet of water of radius $25 \times 10^{-5}\text{ m}$ at $22^\circ\text{C}$. Given: The surface tension of water at the given temperature is $28 \times 10^{-2}\text{ N m}^{-1}$.

One mole of benzene is mixed with one mole of toluene. The vapours above the solution contain:

Which of the following is true for a spontaneous galvanic cell?

Arrange in increasing order of boiling points: (A) 2,2-dimethylpropane, (B) 2-methylbutane, (C) n-pentane, (D) n-butane.

Assertion (A): Highest oxidation state of Mn is +7 in most of the transition elements.
Reason (R): Transition metals exhibit variable oxidation states.

Which of the following is most basic?