List of top Chemistry Questions

One mole of an ideal gas passes through a process where pressure and volume obey the relation $P =P_{o} \left[1- \frac{1}{2} \left(\frac{V_{0}}{V}\right)^{2}\right] $ .Here $P_o$ and $V_o$ are constants. Calculate the change in the temperature of the gas if its volume changes from $V_o$ to $2 V_o$ .
The increasing order of nucleophilicity of the following nucleophiles is : (a) ${CH_3CO^{\ominus}_2}$ (b) ${H_2O} $ (c) ${CH_3SO^{\ominus}_3}$ (d) ${O^{\ominus}H}$
The artificial sweetner stable at cooking temperature and does not provide calories is :
Among the following molecules / ions, $C^{2-}_{2}, N^{2-}_{2}, O^{2-}_{2}, O_{2}$ which one is diamagnetic and has the shortest bond length?
The amphoteric hydroxide is :
The percentage composition of carbon by mole in methane is :
If the kinetic energy of $O_2$ gas is $4.0 \,kJ \; mol^{-1}$ . its RMS speed in $cm \; s^{-1}$ is
The structure of Nylon-6 is :
Polyblend, a fine powder of recycled modified plastic, has proved to be a good material for:
The alkane that gives only one mono-chloro product on chlorination with $Cl_2$ in presence of diffused sunlight is :
Consider the $bcc$ unit cells of the solids $1$ and $2$ with the position of atoms as shown below. The radius of atom $B$ is twice that of atom $A$. The unit cell edge length is $50\%$ more in solid $2$ than in $1$. What is the approximate packing efficiency in solid $2$ ?
${K_2HgI_4}$ is $40\%$ ionised in aqueous solution. The value of its van't Hoff factor (i) is :
If dichloromethane (DCM) and water ${(H_2O)}$ are used for differential extraction, which one of the following statements is correct ?
With respect to an ore, Ellingham diagram helps to predict the feasibility of its -
For a reaction, activation energy E$_a$=0 and the rate constant at 200K is 1.6×10$^6$s$^{-1}$. The rate constant at 400K will be- [Given that gas constant] R= 8.314 J K$^{-1}$ mol$^{-1}$
The pair that has similar atomic radii is :
Under isothermal condition, a gas at 300 K expands from 0.1 L to 0.25 L against a constant externalpressureof2bar Theworkdonebythe gas i s : [Given that 1Lbar= 100J)
If the rate constant for a first order reaction is k, the time(t) required for the completion of 99% of the reaction is given by :
In which case change in entropy is negative ?
Sodium metal on dissolution in liquid ammonia gives a deep blue solution due to the formation of:
For the following reactions, equilibrium constants are given : $S\left(s\right)+O_{2}\left(g\right) $${\rightleftharpoons}$$SO_{2}\left(g\right); K_{1} =10^{52}$ $2S\left(s\right)+3O_{2}\left(g\right) $${\rightleftharpoons}$$2SO_{3}\left(g\right); K_{2} = 10^{129}$ The eqilibrium constant for the reaction, $2SO_{2}\left(g\right)+O_{2}\left(g\right)$${\rightleftharpoons}$$2SO_{3}\left(g\right)$ is :
$ {Mn_2(CO)_{10}}$ is an organometallic compound due to the presence of :
During nitration of benzene, the attacking electrophile is
Saccharin an artificial sweetener is manufactured from
What is hybridization of O in H2O?