List of top Chemistry Questions

Ionisation potential of hydrogen atom is 13.6 eV. Hydrogen atom in ground state is excited by monochromatic light of energy 12.1 eV. The spectral lines emitted by hydrogen according to Bohr?? theory will be

Consider the following set of reactions : $ {CH3COOH ->[SOCl_2] A}$$ { ->[Benzene][Anhyd. AlCl_3] B}$$ { ->[HCN] C}$$ { ->[HOH] D}$ The structure of D would be

Calculate the overall complex dissociation equilibrium constant for the $[Cu(NH_3)_4]^{2+}$ ions, given that stability constant ($\beta$) for this complex is $2.1 \times 10^{13}$.

trans-Pent-2-ene is polar but trans- but-2-ene is non-polar. The polarity of cis-isomer is more than trans-isomer, which are either non-polar or less polar.

The number of tetrahedral voids is double the number of octahedral voids. The size of the tetrahedral voids is half of that of the octahedral void.

Hydrides of group-16 elements show volatility in the order : $H_2O > H_2S > H_2Se > H_2Te$ Electronegativity of group-16 elements increases down the group from oxygen to tellurium.

$[Fe(CN)_6]^{3-}$ has $d^2sp^3$ type hybridisation. $[Fe(CN)_6]^{3-}$ ion shows magnetic moment corresponding to two unpaired electrons.

Aromatic aldehydes and formaldehyde undergo Cannizzaro reaction. Aromatic aldehydes are almost as reactive as formaldehyde.

Which of the following compounds is aromatic in nature?

$H_2O$ is polar, whereas $BeF_2$ is not because

On the basis of standard electrode potential of redox couples given below, find out which of the following is the strongest oxidising agent. (E$^{\circ}$ values : $Fe^{3+}\left| Fe^{2+}=+ 0.77 V ; I_{2\left(s\right)}\right|I^{- } =$ $+ 0.54 V; Cu^{2+}\left|Cu= + .34 V ; Ag^{+}\right| Ag = + 0.80 V$)

Among $Me_3N, C_5H_5N$ and $MeCN$ ($Me$ = methyl group) the electronegativity of $N$ is in the order

Which of the following is a monomer of Dacron:

Which of the following is a meso compound ?

Which of the following is Reimer - Tieman reaction?

Which one of the following will be reactive for Perkin condensation ?

Which of the following effects of $-NO_2$ group operates on $-NH_2$ group in this molecule ?

What is the name of the following reaction? $ HCHO + HCHO { ->[{NaOH}][{\Delta}] }CH_3OH + HCOONa$

For car battery which one is correct statement ?

Which of the following is a lyophobic colloid :

The enthalpy of the formation of $CO_2$ and $H_2O$ are - $395\, kJ$ and - $285\, kJ$ respectively and the enthalpy of combustion of acetic acid is $869\, kJ.$ The enthalpy of formation of acetic acid is:

Among the following compounds of Boron, the species which also forms $\pi $ - bond in addition to $\sigma$ - bonds is:

In terms of polar character which one of the following orders is correct?

Give the IUPAC name for the following structure :

Which of the following relation represents correct relation between standard electrode potential and equilibrium constant? ?. $\log K=\frac{n F E^{\circ}}{2.303 R T}$ II. $K=e^{\frac{n F E^{\circ}}{R T}}$ III. $\log K=\frac{-n F E^{\circ}}{2.303 R T}$ IV. $\log K=0.4342 \frac{n F E^{\circ}}{R T}$ Choose the correct statement(s).