List of top Chemistry Questions asked in AIIMS

The size of colloidal particle is
The empirical formula of a compound is $CH_2O$. Its molecular weight is $180$. The molecular formula of the compound is
Beilstein test is used for the detection of

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R

Assertion (A) : Reaction of conc. \(H_2SO_4\) on \(NaBr\) and \(NaI\) does not give \(HBr\) and \(HI\).

Reason (R) : \(HBr\) and \(HI\) are oxidised by conc. HSO to Br and I.

In the light of the above statements, choose the correct answer from the options given below

Toluene can be oxidised to benzoic acid by
The specific conductivity of $N / 10 KCl$ solution at $20^{\circ} C$ is $0.0212 \,ohm ^{-1} cm ^{-1}$ and the resistance of cell containing this solution at $20^{\circ} C$ is $55 ohm$. The cell constant is
Xenon forms fluorides. Because 5d-orbitals are available for valence shell expansion.
Which oxide of nitrogen is obtained on heating ammonium nitrate at $250^{\circ} C$ ?
Which of the following exhibits the weakest intermolecular forces?
Which is the strongest acid in the following ?
Which among the following has the largest dipole moment?
The propene reacts with $HBr$ to form
The meta-directing group in the following is
The correct order of the increasing ionic character is
Internal energy does not include
In the reaction: Phenol $ { ->[{NaOH}][{CHCl_3}] }$ $A$ $ { ->[{H^+}][{}] }$ $B, B$ is identified as
If magnesium atom having atomic number $12$ has an isotope with mass number $26$, then the number of protons, neutrons and electrons respectively of the atom are
If $300\,mL$ of a gas at $27^{\circ} C$ is cooled to $7^{\circ} C$ at constant pressure, its final volume will be
$CuSO_4$ reacts with $KCN$ solution and forms
Zinc displaces copper from copper sulphate solution. The $E^{\circ}_{298\, K}$ of $Zn$ is $-0.76 \,V$ and that of $Cu$ is $+0.34 \,V$.
Tailing of mercury occurs on passing ozone through it. Due to oxidation of mercury.
Lower aldehydes and ketones are soluble in water but the solubility decreases as the molecular masses increase. Distinction between aldehydes and ketones can be made by Tollens??test.
Pressure in a mixture of $4 \,g$ of $O _{2}$ and $2\, g$ of $H _{2}$ confined in a bulb of 1 litre at $0^{\circ} C$ is
Which of the following are ${ }_{16} S ^{32}$ and ${ }_{15} Pb ^{31}$ ?
Which of the following transition elements shows the highest oxidation state?