List of top Chemistry Questions

What is the conjugate base of \(H_2CO_3\) according to the Bronsted-Lowry theory?

Which of the following choices represents \(^{239}_{94}Pu\) producing a positron?

Stomach acid has a pH of approximately 2. Sour milk has a pH of 6. Stomach acid is

For the isoelectronic series \(S^{2-}, Cl^{-}, Ar, K^{+}\) and \(v\), which species requires the least energy to remove an outer electron?

Beyond the critical point of H2O

The energy required to excite the electron in the atom from n=1 to n=2, when the ionisation enthalpy of hydrogen atom is \(1.312 \times 10^6\) J/mol will be (in the unit of \(10^5\))

Which of the following molecules can be described as having sp hybridisation?

Which of the following best explains, why a hot air balloon rises?

Which of the following molecules represents the order of hybridisation sp² , sp² , sp, sp from left to right atoms ?

If molar conductivity of \(Ca^{2+}\) and \(Cl^-\) ions are 119 and 71 Scm² mol^-1 respectivily, then the molar conductivity of \(CaCl_2\) at infinite dilution is

\Mien borax is heated dining borax bead test along with CoO (Cobalt Oxide) on a loop of platinum (Pt) wire, it swells up and produces a blue colored bead. Which of the following compounds is responsible for the blue color?

The volume of $O_2$ (in L) that can be produced at STP by heating 112 g of $ {KClO_3}$ is approximately (Molar mass of $ {KCIO_3 = 122.6 \, g \, mol^{-1}}$)

If 10 L of an ideal gas at a pressure of 5 atm expands isothermally and reversibly to a final volume of 100 L. the work done and heat absorbed in this process (in Lit-atm), respectively are

Hydrogen peroxide reacts with lead sulphide to produce lead sulphate. Identify the other product formed

Nylon 6 is prepared from

The number of resonance structures possible for anisole is

Producer gas is a mixture of

$100\, mL \,O _{2}$ and $H _{2}$ kept at same temperature and pressure. What is true about their number of molecules

Which of the following is strongest nucleophile

Which of the following element do not form complex with EDTA?

Which of the following will have a meso-isomer also?

If $V$ is the volume of one molecule of gas under given conditions, the van der Waal?s constant $b$ is

If the Planck?s constant $h = 6.6 \times 10^{-34} \, Js$, the de Broglie wavelength of a particle having momentum of $3.3 \times 10^{-24} \, kg \, ms^{-1}$ will be

Arrange the following alcohols in increasing order of their reactivity towards the reaction with $HCl$. $\left( CH _{3}\right)_{2} CH - OH (1),\left( CH _{3}\right)_{3} C - OH (2),\left( C _{6} H _{5}\right)_{3} COH (3)$