List of top Chemistry Questions asked in AIIMS

In diborane, the two $H-B-H$ angles are nearly :

Among the following molecules (i)$\overset{\bullet \bullet}{Xe}O_{3}$ (ii)$\overset{\bullet \bullet}{Xe}OF_4$ (iii)$\overset{\bullet \bullet}{Xe}F_6$ those having same number of lone pairs on $Xe$ are

: $SeCl_4$ does not have a tetrahedral structure. :$Se$ in $SeCl_4$ has two lone pairs.

Which one of the following statements is true for protein synthesis (translation)?

$CH_3CO_2C_2H_5$ on reaction with sodium ethoxide in ethanol gives $A$, which on heating in the presence of acid gives $B$. Compound $B$ is

Compressibility factor for hydrogen varies with pressure with positive slope at all pressure. Even at low pressure, repulsive forces dominate for hydrogen gas.

$3$-Phenylpropene on reaction with $HBr$ gives (as a major product)

The nucleic acid base having two possible binding sites is

Dimethyl glyoxime gives a red precipitate with $Ni ^{2+}$, which is used for its detection. To get this precipitate readily the best $pH$ range is

Among the following the dissociation constant is highest for

Which of the following is not considered as an organometallic compound?

$o- $Toluic acid on reaction with $Br _{2}+ Fe$ gives

The statement true for $N_3^-$ is

The reagent used for the separation of acetaldehyde from acetophenone is

Of the following which change will shift the reaction towards the product? $I_2(g) \rightleftharpoons 2I(g) $ $\Delta H^{\circ} (298\, K) = +150\, kJ$

Which of the following is a biodegradable polymer?

The liquefied metal expanding on solidification is :

The geometrical isomerism is shown by

The element which forms oxides in all oxidation states $+1$ to $+5$ is

The dipole moment is the highest for

The crystal system of a compound with unit cell dimensions $a = 0.387\, nm$, $b = 0.387\, nm$ and $c = 0.504 \,nm$ and $\alpha = \beta = 90^{\circ}$ and $\gamma$ = $120^{\circ}$ is

The compound having only primary hydrogen atoms is

The average osmotic pressure of human blood is $7.8$ bar at $37^{\circ}\, C$. What is the concentration of an aqueous $NaCl$ solution that could be used in the blood stream?

How much energy is released when 6 moles of octane is burnt in air ? Given $\Delta H_{f}{ }^{\circ}$ for $CO _{2}(g), H _{2} O (g)$ and $C _{8} H _{18}(l)$ respectively are $-490,-240$ and $+160\, J / mol :$

The $pK_a$ of acetic acid is lower than that of phenol. Phenoxide ion is more resonance stabilised.