List of top Chemistry Questions asked in AIIMS

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.

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

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

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.

$HClO_4$ is a stronger acid than $HClO_3$. Oxidation state of chlorine in $HClO_4$ is $+7$ and in $HClO_3$ is $+5$.