List of top Chemistry Questions

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 :
Saccharin an artificial sweetener is manufactured from
During nitration of benzene, the attacking electrophile is
What is hybridization of O in H2O?
Which cannot behave as a nucleophile for SN2 reaction?
If half-life of a substance is 36 minutes. Find amount left after 2 hrs. Initial amount 10 gm?
Mole of N2=0.4 and moles of O2=0.1. Find PN2. (Partial pressure) N2 =? At atmospheric pressure
Which of the following will not be formed when calcium formate?
Which one of the following nitro compound does not react with nitrous acid?
\( E=^0_{cr^{3+}/cr}=-0.72 V, E^0_{fe^{2+}/fe}=-0.42\) The potential for the cell  Cr|Cr3+(0.1 M) || Fe2+(o.01 M) Fe is
How many ions obtain after dissociation of this complex [Co(NH3)6]Cl3?
The magnetic moment of Ni2+ ion (atomic number of Ni=28) in BM unit is
The main product obtained from phenol with PCl5 is
An element with mass number 81 contains 31.7% more neutrons as compared to
Which of the following statement is correct fro isotope of carbon?
2KHCO3→CO2 + H2O find amount of gases formed (in lit.). When amount of KHCO3 is 33 gm.
Final product C is Final product C is
Most common isotopes of hydrogen (non-radioactive) is