List of top Chemistry Questions asked in AIIMS

$K_2Cr_2O_7$ is used as primary standard in volumetric analysis. It has a good solubility in water.
Molecular nitrogen is less reactive than molecular oxygen. The bond length of $N_2$ is shorter than that of oxygen.
$Fe^{3+}$ can be used for coagulation of $As_2S_3$ sol. $Fe^{3+}$ reacts with $As_2S_3$ to give $Fe_2S_3$.
For the Daniel cell, $Zn\left| Zn^{2+}\right|\left| Cu^{2+}\right| Cu$ with $E_{\text{cell}} = 1 . 1\, V$, the application of opposite potential greater than $1 . 1\, V$ results into flow of electron from cathode to anode. $Zn$ is deposited at anode and $Cu$ is dissolved at cathode.
Change in colour of acidic solution of potassium dichromate by breath is used to test drunken drivers. Change in colour is due to complexation of alcohol with potassium dichromate.
The number of $P - O - P$ bridges in the structure of phosphorus pentoxide and phosphorus trioxide are respectively
Which of the following gives propyne on hydrolysis?
The isoelectronic pair is
Among the following the strongest nucleophile is
When $10\, mL$ of $0.1\, M$ acetic acid $(pK_{a} = 5.0)$ is titrated against $10\, mL$ of $0.1\, M$ ammonia solution $(pK_{b} = 5.0)$, the equivalence point occurs at $pH$
Pyridine is less basic than triethylamine because
Which of the following is a carbonate ore?
Which one of the following biomolecules is insoluble in water?
The major product obtained on treatment of $CH_3 CH_2 CH(F)CH_3$ with $CH_3 O^- /CH_3 OH$ is
The magnetic moment $(\mu ) $ of a revolving electron around the nucleus varies with principal quantum number $n$ as
The ground state energy of hydrogen atom is $-13.6\, eV$. What is the potential energy of the electron in this state?
$SiF_6^{2-}$ is known but $SiCl_6^{2-}$ is not. Size of fluorine is small and its lone pair of electrons interacts with d-orbitals of $Si$ strongly.
Reaction of $SO_2$ and $H_2S$ in the presence of $Fe_2O_3$ catalyst gives elemental sulphur. $SO_2$ is a reducing agent.
Rates of nitration of benzene and hexadeuterobenzene are different. $C - H$ bond is stronger than $C - D$ bond.
Ozone is a powerful oxidising agent in comparison to $O_2$ . Ozone is diamagnetic but $O_2$ is paramagnetic.
First ionisation energy for nitrogen is lower than oxygen. Across a period effective nuclear charge decreases.
Cyclopentadienyl anion is much more stable than allyl anion. Cyclopentadienyl anion is aromatic in character.
Among the following pairs of ions, the lower oxidation state in aqueous solution is more stable than the other, in
In which of the following pairs both the complexes show optical isomerism?
An aqueous solution of $CoCl_2$ on addition of excess of concentrated $HCl$ turns blue due to formation of