List of top Chemistry Questions

Which is the reagent used for the following conversion?
Which of the following is used in the production of freon refrigerant R-22?
The compound which gives the most stable carbocation in elimination reaction is
The highest possible oxidation states of uranium and plutonium, respectively, are
Which of the following compound is aromatic?
The ligand which is used in the treatment of lead poisoning is
The type of isomerism exhibited by the complexes [Co(NH$_3$)$_5$(SO$_4$)]Br and [Co(NH$_3$)$_5$Br]SO$_4$ is
The compound which has the highest freezing point (in K) is
The rate constants of a reaction at $300,K$ and $400,K$ are $1.5,s^{-1}$ and $3,s^{-1}$ respectively. The $E_a$ value is [$\log 2 = 0.3010,\ 2.303R=19,J,K^{-1}mol^{-1}$]
The acid which has the highest ionization constant ($K_a$) at $298,K$ is
Which of the following statement is incorrect?
Which of the following statement is incorrect about the standard electrode potential?
Chlorine has oxidation number $+7$ in
The correct increasing order of average bond length for C=C, N=O, C-C, N-O is
The reaction between N$_2$ and O$_2$ is carried out in a sealed vessel at $300,K$. At equilibrium, $[N_2]=2\times10^{-3}M$, $[O_2]=4\times10^{-3}M$ and $[NO]=2\times10^{-3}M$. What is the value of $K_p$ for the reaction $N_2(g)+O_2(g)\rightleftharpoons2NO(g)$ at $300,K$? $(R=0.08,bar,lit,mol^{-1}K^{-1})$
5 moles of an ideal gas at $100,K$ are allowed to undergo reversible adiabatic compression till its temperature becomes $200,K$. If $C_v=30,J,K^{-1}mol^{-1}$, calculate $\Delta U$ and $\Delta (pV)$ for this process. $(R=8.0,J,K^{-1}mol^{-1})$
Which of the following set of molecules are having zero dipole moment?
Which of the following statement is incorrect about the periodic trend?
Which of the following reaction has the positive value of standard enthalpy of reaction?
$3.0,g$ of a salt of molecular weight $30$ is dissolved in $250,mL$ of water. The molarity of the solution is
Which of the following represents the correct increasing order of first ionization enthalpy for Ca, Ba, S, Se and Ar?
The transition energy of the electron from higher to lower level is $3.0\times10^{-19},J$. The wavelength of the emitted light is about ($h=6.625\times10^{-34},Js,\ c=3\times10^8,ms^{-1}$)
The quantum number symbols are given in List-I and the informations about them are given in List-II. The correct match is}
The work function of a material that has the threshold frequency of \(5 \times 10^{14} \, Hz\) is (\(h = 6.626 \times 10^{-34}\) Js).
The energy of the electron in third excited state of the hydrogen atom is