List of top Chemistry Questions

Aldehydes or ketones when treated with $\ce{C_6H_5 - NH - NH_2}$, the product formed is

The colour and magnetic nature of manganate ion $(MnO^{2-}_4)$ is

What is the actual volume occupied by water molecules present in $20 \, cm^3$ of water ?

The molality of solution containing $15.20\, g$ of urea, (molar mass = $60$) dissolved in $150 \,g$ of water is

$XeF_6$ on partial hydrolysis with water produces a compound $'X'$. The same compound $'X'$ is formed when $XeF_6$ reacts with silica. The compound $'X'$ is :

How many faradays are required to reduce $1\, mol$ of $Cr_{2} O_{7}^{2-}$ to $Cr^{3+}$ in acid medium?

By passing electric current, \(NaClO_3\) is converted into \(NaClO_4\) according to the following equation \(Na ClO_3 + H_2 O \rightarrow NaClO_4 + H_2\) How many moles of \(NaClO_4\) will be formed when three Faradays of charge is passed through \(NaClO_3\) ?

Square planar complexes of the type $M_{ABXL}$ (where $A, B, X$ and $L$ are unidentate ligands) shows following set of isomers

Which of the following compounds will exhibit geometrical isomerism?

For a solution formed by mixing liquids $L$ and $M$, the vapour pressure of $L$ plotted against the mole fraction of $M$ in solution is shown in the following figure. Here $x _{ L }$ and $x _{ M }$ represent mole fractions of $L$ and $M$, respectively, in the solution. The correct statement $(s)$ applicable to this system is (are)

$A\, 6\%$ solution of sucrose $C_{22}H_{22} O_{11}$ is isotonic with $3\%$ solution of an unknown organic substance. The molecular weight of unknown organic substance will be:

The depression in freezing point of $0.1\, M$ aqueous solutions of $HCl$, $CuSO_4$ and $K_2SO_4$ are in the ratio

Azeotropic mixtures are formed only by non-ideal solutions and they may have boiling points either greater than both the components or lesser than both the components. The composition of the vapour phase is same as that of the liquid phase of an azeotropic mixture.

For a reaction $\frac{1}{2} A \to 2B$ rate of disappearance of $A$ is related to rate of appearance of $B$ by the expression

In a flask, the weight ratio of $CH _{4}( g )$ and $SO _{2}(g)$ at $298 \,K$ and 1 bar is $1: 2$. The ratio of the number of molecules of $SO _{2}(g)$ and $CH _{4}(g)$ is

Equivalent weight of NH in the reaction, N $?$ NH is 17/3 while that of N is 28/6. Equivalent weight $\quad\quad \quad \quad \quad= \frac{Molecular\, weight}{Number\, of\, e^{-} lost or gained per mole}$

The colour of the $X_2$ molecules of group $17$ elements changes gradually from yellow to violet down the group. This is due to

Which of the following is an electrophile ?

Which of the following is an electrophile?

For the reaction, $H_{2} + I_{2} {\rightleftharpoons} 2HI, K= 47.6.$ If the initial number of moles of each reactant and product is 1 mole then at equilibrium

The second dissociation constant of fumaric acid is greater than maleic acid. Higher the dissociation constant of acid, more is the acidic character.

$K_a$ for $HCN$ is $5 \times 10^{-10}$ at $25^{\circ}C$. For maintaining a constant $pH\, = \,9$, the volume of $5\, M \,KCN$ solution required to be added to $10 \,mL$ of $2\, M HCN$ solution is

Dissolving $NaCN$ in de-ionized water will result in a solution having

Identify the Br??sted acid in the following equation: $PO _{4}^{3-}+ H _{2} O (l) \longrightarrow HPO _{4}^{2-}(a q)+ OH ^{-}(a q)$

The number of grams/weight of $NH_4Cl$ required to be added to 3 liters of $0.01\, M\, NH_3$ to prepare the buffer of $pH=9.45$ at temperature $298\, K$ ($K_b$ for $NH_3$ is $1.85 \times 10^{-5}$)