List of top Chemistry Questions

The minimum energy required to remove an electron from sodium atom is $3.313 \times 10^{-19}J$. What is the maximum wavelength of radiation that will eject photoelectron from sodium metal? ($h = 6.626 \times 10^{-34}Js$)

Which of the following statements are correct about the postulates of quantum mechanical model of an atom? (i) The energy of electron in atom is quantized.
(ii) The existence of quantized electronic energy level is a result of the particle property of electrons.
(iii) The path of the electron can be determined accurately.
(iv) In a multi electron atom, the electrons are filled in various orbitals in the order of increasing energy.
(v) The probability of finding an electron at a point within an atom is proportional to the square of the orbital wave function.

What is the volume of methanol needed for making $2\,L$ of $0.4\,M$ solution? (Density of methanol $= 0.64\,kg\,L^{-1}$ and molar mass $= 32\,g\,mol^{-1}$)

If the threshold wavelengths of two metals are in the ratio $1:3$, then the work functions of these metals are in the ratio

The vitamin present in vegetable oils and its deficiency causes muscular weakness is

What is the IUPAC name for Glyceraldehyde?

Identify the most stable carbocation among primary, secondary, and tertiary.

Find the volume occupied by \(8\) g of a gas at STP if its vapour density is \(16\).

Calculate the number of carbon atoms present in \(0.35\) mole of glucose \((C_6H_{12}O_6)\).

What is the coordination number of an atom in a Face-Centered Cubic (FCC) crystal structure?

The conductivity of centimolar solution of KCl at 298 K is 0.021 $\Omega^{-1}$ cm$^{-1}$. The resistance of the cell containing the solution at 298 K is 60 $\Omega$. The value of cell constant is

$\Lambda^\circ_m (NH_4OH)$ is equal to ___________

During the electrolysis of acidified water, 16 g of O$_2$ gas is formed. The volume of H$_2$ gas liberated at cathode under STP conditions is

What product is formed when Phenol reacts with concentrated Nitric acid?

What is the approximate magnetic moment of \(Mn^{2+}\)?

How does the maximum kinetic energy of photoelectrons relate to wavelength (\(\lambda\))?

The activation energy for the reaction X \(\rightarrow\) Y is 150 kJ mol\(^{-1}\). The change in enthalpy for the above reaction is -135 kJ mol\(^{-1}\). Then the activation energy for Y \(\rightarrow\) X is _________.

For a reaction having three steps, the overall rate constant is \( K = \frac{k_1 k_2}{k_3} \). The values E\(_{a1}\), E\(_{a2}\) and E\(_{a3}\) (activation energies stepwise) are 40, 50 and 60 kJ mol\(^{-1}\) respectively. Then the overall E\(a\) (activation energy) of the reaction is ______

Which one of the following graph is not applicable for a 1st order reaction (R \(\rightarrow\) P)?

Given below are the half-cell reactions:
$Mn^{2+} + 2e^- \rightarrow Mn$ (E$^\circ$ = -1.18 V)
$Mn^{3+} + e^- \rightarrow Mn^{2+}$ (E$^\circ$ = +1.51 V)
The E$^\circ_{cell}$ for $3Mn^{2+} \rightarrow Mn + 2Mn^{3+}$ will be \textunderscore\textunderscore\textunderscore\textunderscore

What is the Effective Atomic Number (EAN) of $[Fe(CN)_6]^{4-}$?

What are the repeating monomer units of Nylon-6,6?

What is the oxidation state of Phosphorus in \( H_3PO_4 \)?

Which catalyst is used in the Rosenmund Reduction?