List of top Chemistry Questions

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 $1.85 \times 10^{-5}$)

For the reaction $2 HI (g) \rightleftharpoons H _{2}(g)+ I _{2}(g)$ the degree of dissociation $(\alpha)$ of HI(g) is related to equilibrium constant $K_p$ by the expression:

The equilibrium constant for the reaction $N _{2( g )}+ O _{2( g )} \rightleftharpoons 2 NO _{( g )}$ is $4 \times 10^{-4}$ at $2000\,K$. In presence of a catalyst the equilibrium is attained ten times faster. Therefore the equilibrium constant in presence of catalyst of $2000\, K$ is

The reaction quotient '$Q$' is useful in predicting the direction of the reaction. Which of the following is incorrect ?

Pick the correct statement among the following:

An ideal gas is undergoing a cyclic thermodynamic process in different ways as shown in the corresponding $ Which one of the following options correctly represents a thermodynamic process that is used as a correction in the determination of the speed of sound in an ideal gas?

Which of the following oxoacids of phosphorus is a reducing agent and a monobasic acid as well?

Which of these compounds are directional?

$ZnO$ is white when cold and yellow when heated. It is due to the development of

What is the name of the following reaction? $ {PhCHO + (CH3CO)2O ->[Na(OAc)_2] PhCH=CHCO2H}$

What is the correct order of basicity among the following compounds ?

Thermodynamic properties are divided into two broad types : intensive properties and extensive properties. Which of the following is not an intensive property?

(R)-2-Iodobutane is treated with $NaI$ in acetone and allowed to stand for a long time. The product eventually formed is