List of top Chemistry Questions

A crystalline solid $XY_3$ has $ccp$ arrangement for its element $Y. X $ occupies

$1.78\, g$ of an optically active L-amino acid $(A)$ is treated with $NaNO_2/HCl$ at $0\,^\circ\,C$. $448\, cm^3$ of nitrogen was at $STP$ is evolved. A sample of protein has $0.25\%$ of this amino acid by mass. The molar mass of the protein is

For a spontaneous process, the correct statement(s) is (are)

The compound that reacts the fastest with sodium methoxide is

$50\,cm^3$ of $0.04 \,M \,K_2 Cr_2 O_7$ in acidic medium oxidizes a sample of $H_2S$ gas to sulphur. Volume of $0.03\, M$ $KMnO_4$ required to oxidize the same amount of $H_2S$ gas to sulphur, in acidic medium is

The IUPAC name of the complex ion formed when gold dissolves in aquaregia is

Dettol contains

Negatively charged particles are called

$45\, g$ of ethylene glycol $\left(C_{2} H_{6} O_{2}\right)$ is mixed with $600\, g$ of water, what is the depression of freezing point?

Hydrogen peroxide in its reaction with $ KIO_4 $ and $ NH_2OH $ respectively, is acting as a

$10\, g$ of a mixture of $BaO$ and $ CaO$ requires $100 \, cm^3$ of $2.5\, M\, HCl$ to react completely. The percentage of calcium oxide in the mixture is approximately (Given : molar mass of $BaO \,= \,153$)

According to Raoult?s law, the relative lowering of vapour pressure for a solution is equal to

Which among the following is a non-colligative property?

An ideal solution obeys Raoult?? law. In an ideal solution, solute-solute as well as solvent-solvent interactions are similar to solute-solvent interactions.

van't Hoff factor for $Ca(NO_3)_2$ is

Which one of the following has minimum freezing point ?

The value of Henry�s constant K is

The weight of $AgCl$ precipitated when a solution containing 5.85 g of $NaCl$ is added to a solution containing 3.4 g of $ {AgNO_3}$ is

An exothermic chemical reaction proceeds by two stages. Reactants ${ ->[Stage\, 1] }$ Intermediate ${ ->[Stage\, 2] }$ Products The activation energy of state $I$ is $50 \,kJ$ $mol^{-1}$. The overall enthalpy change for the reaction is $-100 \,kJ$ $mol^{-1}$. Which diagram could represent the energy level diagram for the reaction?

For the elementary reaction, $M\rightarrow N$, the rate of disappearance of $M$ increases by a factor of $8$ upon doubling the concentration of $M$. The order of the reaction with respect to $M$ is

If a first order reaction takes $40$ minutes for $75\%$ completion, then time required for $50\%$ completion is

For the reaction $ {$A_{\left(g\right)}$ ->$ B_{\left(g\right)}$ + $C_{\left(g\right)}$, }$ the rate constant is given as (P is initial pressure and P is pressure at time t)

The rate of a chemical reaction doubles for every 10� rise in temperature. If the temperature increases by 60�, the rate of reaction increases

Which one of the following data has only four significant figures?