List of top Chemistry Questions asked in AIIMS

Of the following, the oxime of which shows geometrical isomerism is

Freon used as refrigerant is

The reduction potential at $pH = 14$ for the $Cu^{2+} /Cu$ couples is [ Given , $E^{\circ}_{Cu^{2+}}/Cu = 0.34 \,V; K_{sp} Cu(OH)_2 = 1\times 10^{-19}$

In a set of reactions, acetic acid yielded product $ D.C{{H}_{3}}COOH\xrightarrow{SOC{{l}_{2}}}A\xrightarrow[Anhy.\,\,AlC{{l}_{3}}]{Benzene} $ $ B\xrightarrow{HCN}C\xrightarrow{HOH}D $ . The structure of $ D $ would be

Freon used as refrigerant is

The weight of iron which will be converted into its oxide $\left( Fe _{3} O _{4}\right)$ by the action of $18\, g$ of steam on it will be (At. wt. of $Fe =56$ )

: Equal moles of different substances contain same number of constituent particles. : Equal weights of different substances contain the same number of constituent particles.

: Higher the molal depression constant of the solvent used, higher the freezing point of the solution. : Depression in freezing point does not depend on the nature of the solvent.

The oxidation state of chromium in the final product formed by the reaction between $KI$ and acidified potassium dichromate solution is

Find the number of stereoisomers of 1,2-dihydroxy cyclopentane.

: Both Grignard reagent and dialkyl cadmium react with acid chlorides to form tert-alcohols. : Grignard reagents are as reactive as dialkyl cadmium.

: A catalyst increases the rate of a reaction. : In presence of a catalyst, the activation energy of the reaction decreases.

For a first order gas phase reaction- $A_{\left(g\right)} \to 2B_{\left(g\right)} + C_{\left(g\right)}$ P be initial pressure of A and P the total pressure at time 't'. Integrated rate equation is

Which one of the following species is diamagnetic in nature?

: Methyl cyanide has higher boiling point than methyl isocyanide. : Dipole moment of methyl cyanide is higher than that of methyl isocyanide.

$K_{sp}$ of $CaSO_4\cdot5H_2O$ is 9 x $10^{-6}$, find the volume for 1 g of $CaSO_4$ (M.wt. = 136).

$bcc$ and $hcp$ has same packing efficiency. Both have same number of atoms per unit cell and same arrangement.

The correct decreasing order of $pK_b$ is

For adiabatic process, which is correct?

The freezer in a refrigerator is located at the top section so that

The enthalpy of formation of $CO_{\left(g\right),} CO_{2\left(g\right)}, N_{2}O_{\left(g\right)}$ and $N_{2}O_{4\left(g\right)}$ is -110, -393, +811 and 10 kj/mol respectively. For the reaction, $N_{2}O_{4\left(g\right)}+3CO_{\left(g\right)}\to N_{2}O_{\left(g\right)}+3CO_{2\left(g\right)}.\Delta H_{r} \left(kJ/mol\right)$ is

$PCl_3$ on hydrolysis gives fumes of

Which of the following is not a thermodynamic function?

Which of the following is wrong for Bohr model?

When alkyl halide is heated with dry $Ag _{2} O$, it produces