List of top Chemistry Questions

For standardizing NaOH solution, which of the following is used as a primary standard ?
The $IUPAC$ name of the following compound is
When an electric current is passed through acidified water, $112\, mL$ of hydrogen gas at N.T.P. was collected at the cathode in $965$ seconds. The current passed, in ampere, is :
In $KO_2$, the nature of oxygen species and the oxidation state of oxygen atom are, respectively :
In the molecular orbital diagram for the molecular ion, $N_2{^{+}}$, the number of electrons in the $\sigma_{2p}$ molecular orbital is :
At $518^{\circ} C$ , the rate of decomposition of sample of gaseous acetaldehyde, initially at a pressure of $363$ Torr, was $1. 00$ Torr $s^{-1}$ when $5\%$ had reacted and $0.5$ Torr $s^{-1}$ when $33\%$ had reacted. The order of the reaction is -
A $100.0\, mL$ dilute solution of $Ag ^{+}$is electrolysed for $15.0$ minutes with a current of $1.25 \,mA$ and the silver is removed completely. What was the initial $\left[ Ag ^{+}\right]$?
Hydrogen peroxide oxidises $[Fe(CN)6]^{4-}$ to $[Fe(CN)6]^{3-}$ in acidic medium but reduces $[Fe(CN)6]^{3-}$ to$[Fe(CN)6]^{4-}$ in alkaline medium. The other products formed are, respectively
The oxidation states of $Cr$ in $ [Cr(H_2O)_6]Cl_3, [Cr(C_6H_6)_2]$, and $K_2[Cr(CN)_2(O)_2(O_2)(NH_3)]$ respectively are :
When $9.65\,A$ current was passed for $1.0\, hour$ into nitrobenzene in acidic medium, the amount of p-aminophenol produced is_____.
How long (approximate) should water be electrolysed by passing through $100$ amperes current so that the oxygen released can completely burn $27.66 \,g$ of diborane ? (Atomic weight of $B = 10.8\, u$ )
Why is the heat evolved in neutralization of HF is highest
The species, which has the bond order same as that of $F_2$, molecule is
Dead burnt plaster is
Identify the major product that is obtained on treatment of \(CH_3CH_2CH(F)CH_3\) with \(CH_3O^-/CH^3OH\) is
A 100 mL flask contained \(H_2\) at 200 torr, and a 200 mL flask contained \(He\) at 100 torr. The two flask were then connected so that each gas filled their combined volume. Assume, no change in temperature, total pressure is
The value of magnetic quantum number of the last electron of " $ Na $ " is
The ratio of the half-life time $ (t_{1/2}) $ , to the three quarter life-time, $ (t_{3/4}) $ , for a reaction that is second order
The ratio of lowest energy in terms of wave numbers of Balmer and Lyman series of lines of atomic spectrum of hydrogen is
The environmental friendly chemical now-a-days used for bleaching the paper in the presence of a suitable catalyst is
In Wilkinson?s catalyst, the hybridization of central metal ion and its shape are respectively :
The number of $P - O$ bonds in $P_4O_6$ is :
Two moles of an ideal monoatomic gas occupies a volume $V$ at $27^{\circ}C$. The gas expands adiabatically to a volume $2V$. Calculate $(a)$ the final temperature of the gas and $(b) $ change in its internal energy -
Which of the following statements is false?
The most polar compound among the following is :