List of top Chemistry Questions

What is the major product formed when phenol is treated with sodium dichromate ($ \text{Na}_2\text{Cr}_2\text{O}_7 $) and sulfuric acid ($ \text{H}_2\text{SO}_4 $)?

What is the major product of the reaction?

The number of ions formed on dissolving one mole of $ \text{K_3[\text{Fe}(\text{CN})_6] $ in water is:}

Which compound is formed as the final product $ B $?

The alloy formed by beryllium with 'X' is used in the preparation of high-strength springs. 'X' is:

In which of the following Galvanic cells, emf is maximum? (Given: $ E^\circ_{\text{Mg}} = -2.36 \, V $ and $ E^\circ_{\text{Cl}_2/\text{Cl}^-} = +1.36 \, V $)

Which non-metallic solid is known for its electrical conductivity?

Which transition metal does not form ‘MO’ type oxide? (M = transition metal)

Among $[Co(CN)_4]^{4-}$, $[Co(CO)_3(NO)]$, $XeF_4$, $[PCl_4]^+$, $[PdCl_4]^{2-}$, $[ICl_4]^-$, $[Cu(CN)_4]^{3-}$, and $P_4$, the total number of species with tetrahedral geometry is:

If the longest wavelength of the spectral line of the Paschen series of $ \text{Li}^{2+} $ ion spectrum is $ x $ Å, then the longest wavelength (in Å) of the Lyman series of the hydrogen spectrum is:

Arrange the following compounds in increasing order of their boiling points:

$\mathrm{C_2H_5OH}$ (Ethanol)
$\mathrm{CH_3CHO}$ (Acetaldehyde)
$\mathrm{CH_3CH_2CH_3}$ (Propane)
$\mathrm{CH_3OCH_3}$ (Dimethyl ether)

14g of cyclopropane burnt completely in excess oxygen. The number of moles of water formed is:

A → P is a first order reaction. The following graph is obtained for this reaction. (x-axis = time; y-axis = conc. of A). The instantaneous rate of the reaction at point C is

Which of the following has the least electron gain enthalpy?

In the ground state of hydrogen atom, electron absorbs 1.5 times energy than the minimum energy $ (2.18 \times 10^{-18} J)$ to escape from the atom. The wavelength of the emitted electron (in m) is $(m_e = 9 \times 10^{-31} kg)$

The gas which makes lime water milky is

Bond between two nitrogen atoms in Nitrogen molecule is

Aniline on direct nitration at 288 K gives 51% (A), 47% (B) and 2% (C). ‘B’ on diazotisation, followed by reaction with CuCN | KCN gives a compound X. The percentage of nitrogen in X is:

Ammonia is synthesized in the Haber process in the following reaction.
$𝑁_2 (𝑔) + 3𝐻_2 (𝑔) → 2𝑁𝐻_3(𝑔)$
The temperature above which the reaction becomes spontaneous is __________ 𝐾 (rounded off to one decimal place).
($\bigtriangleup 𝐻^0 = −92.2 𝑘𝐽, \bigtriangleup 𝑆^0 = −199 𝐽𝐾^{ −1}$ )

A cylinder contains 50 𝐿 of an ideal gas at a pressure of 50 𝑎𝑡𝑚. Assuming that the temperature remains unchanged, the volume of the gas at 1 𝑎𝑡𝑚 is __________ 𝐿 (rounded off to the nearest integer).

Thermite welding is caused by the formation of which compound?

The de Broglie wavelength of an electron with kinetic energy of $ 2.5 $ eV is (in m): \[ (1 \text{ eV} = 1.6 \times 10^{-19} \text{ J}, \quad m_e = 9 \times 10^{-31} \text{ kg}) \]

Ionic character of the covalent bonds in the compounds Cl2, HCl, NaCl, NaF follows the order

Which of the following is adsorbent?

Which of the following has a higher dipole moment?