List of top Chemistry Questions asked in AIIMS

Which one of the following is the true covalent oxide of iodine?

The temperature dependence of rate constant $(k)$ of a chemical reaction is written in terms of Arrhenius equation $k=A e^{-E_{\alpha} / R T}$. Activation energy $\left(E_{a}\right)$ of the reaction can be calculated by ploting

When $H _{2} S$ gas is passed through the $HCl$ containing aqueous solution of $CuCl _{2}, HgCl _{2}$, $BiCl _{3}$ and $CoCl _{2}$, it does not precipitate out

Among the following components of cement which is present in highest amount?

Among the following, the species having square planar geometry for central atom are: (i) $XeF _{4}$ (ii) $SF _{4}$ (iii) $\left[ NiCl _{4}\right]^{2-}$ (iv) $\left[ PtCl _{4}\right]^{2-}$

Anilinium chloride is more acidic than ammonium chloride. Anilinium chloride is resonance stabilised.

The pair in which both species have same magnetic moment (spin only value) is

A $5 \%$ solution (by mass) of cane sugar in water has freezing point of $271 \,K$ and freezing point of pure water is $273.15 \,K$. The freezing point of a $5 \%$ solution (by mass) of glucose in water is

The water pouch of instant cold pack for treating athletic injuries breaks when squeezed and $NH_4NO_3$ dissolves lowering the temperature. Addition of nonvolatile solute into solvent results into depression of freezing point of solvent.

According to transition state theory, for the formation of an activated complex, one of the vibrational degrees of freedom is converted into a translational degree of freedom. Energy of the activated complex is higher than the energy of reactant molecules.

Among the following which one can have a meso form?

$40\, ml$ of $0.1\, M$ ammonia solution is mixed with $20 \,ml$ of $0.1\, M\, HCl$. What is the $pH$ of the mixture? $\left( p K_{b}\right.$ of ammonia solution is $\left.4.74\right)$

Nitrobenzene on treatment with zinc dust and aqueous ammonium chloride gives

Methyl- $\alpha-D$-glucoside and methyl $-\beta-D$-glucoside are

Which of the following compounds has the highest boiling point?

The incorrect statement among the following is

In $[Ag(CN)_2]^-$ , the number of $\pi$ bonds is

For a spontaneous process the correct statement is

Water in liquid state is more stable than ice at room temperature. Water in liquid form has higher entropy than ice.

In the iodometric titration starch is used as an indicator. Starch is a polysaccharide.

Graphite is an example of tetragonal crystal system. For a tetragonal system, $a=b \neq c, \alpha=\beta$ $=90^{\circ}, \gamma=120^{\circ}$

Among the following L-serine is

Thymine is

Isopropyl benzene on air oxidation in the presence of dilute acid gives

Lysine is least soluble in water in the $pH$ range