List of top Chemistry Questions

A solution of $MgCl_2$ in water has pH
What is equilibrium expression for the reaction, $ {2NO_{(g)} + Cl_{2(g)} <=> 2NOCl_{(g)} }$ ?
Given that, the solubility product $K_{sp}$ of $AgCl$ is $1.8 \times 10^{-10}$, the concentration of $Cl^-$ ions that must be exceeded before $AgCl$ will precipitate from a solution containing $4 \times 10^{-3}\, M \,Ag^+$ ions is
A solution of $Cu(NO_3)_2$ in water is acidic due to
Degree of dissociation of $0.1 \,N \,CH_{3}COOH$ is $(K_{\text{acid}}=1\times10^{-5})$
0.01 M solution of $H_2A$ has pH equal to 4. If $K_{a1}$ for the acid is $4.45 \times 10^{-7}$, the concentration of $HA^-$ ion in solution would be
Phosphorus pentachloride dissociates as follows in a closed reaction vessel, $PCl_{5\left(g\right)} {\rightleftharpoons} PCl_{3\left(g\right)}+Cl_{2\left(g\right)}$ If total pressure at equilibrium of the reaction mixture is $p$ and degree of dissociation of $PCl_{5}$ is $x$, the partial pressure of $PCl_{3}$ will be
$2NO_{2} {\rightleftharpoons} N_{2}O_{4}+34\, kcal$ ; reaction moves forward at
$4.5 \,moles$ each of hydrogen and iodine were heated in a sealed ten litre vessel. At equilibrium 3 moles of HI were found. The equilibrium constant for $ {H_{2(g)} +I_{2(g)}}$ is
A buffer solution is prepared by mixing 10 mL of 1.0 M acetic acid and 20 mL of 0.5 M sodium acetate acid and then diluted to 100 mL with distilled water. If the $pK_a$ of $CH_3COOH$ is 4.76, what is the pH of the buffer solution prepared ?
Calculate $K_c$ for the reversible process given below if $K_p = 167$ and $T = 800^?C$. $ {CaCO_{3(s)} <=> CaO_{(s)} + CO_{2(g)}}$
A mixture of $1.57\,mol$ of $N_2$, $1.92\, mol$ of $H_2$ and $8.13\,mol$ of $NH_3$ is introduced into a $20\,L$ reaction vessel at $500\, K$. At this temperature, the equilibrium constant, $K_c$ for the reaction, $ {N_{2(g)} + 3H_{2(g)} <=> 2NH_{3(g)}}$ is $1.7 \times 10^2$. What is the direction of the net reaction?
A monoprotic acid in a 0.1 M solution ionizes to 0.001%. Its ionisation constant is
A salt X is dissolved in water having pH =7. The resulting solution has a pH more than 7. The salt is made by neutralisation of
A solution which resists the change in its pH value on addition of some amount of acid or base is called
A universal indicator
An acid solution has a $pH = 6$. It is diluted 100 times, the $pH$ of the resultant solution would be
An amount of solid $NH_4HS$ is placed in a flask already containing ammonia gas at a certain temperature and 0.50 atm. pressure. Ammonium hydrogen sulphide decomposes to yield $NH_3$ and $H_2S$ gases in the flask. When the decomposition reaction reaches equilibrium, the total pressure in the flask rises to 0.84 atm. The equilibrium constant for $NH_4HS$ decomposition at this temperature is
An aqueous solution in which the $H^+$ ion concentration is greater than $10^{-7}$ M is said to be
Benzoic acid is stronger acid than acetic acid. $K_a$ for benzoic acid is $6.5 \times 10^{-5}$ and for acetic acid is $1.74 \times 10^{-5}$.
If reaction quotient, $Q_c$ for a particular reaction is greater than $K_c$, the reaction will proceed in the direction of reactants. Reaction quotient is defined in the same way as the equilibrium constant $K_c$ except that the concentrations in $Q_c$ are not necessarily equilibrium values.
Assuming complete ionization, the pH of 0.1 M, HCl is 1. The molarity of $H_2SO_4$ with the same pH is
Assuming $H_2SO_4$ to be completely ionised the pH of a 0.05 molar.aqueous solution of sulphuric acid is approximately
At $1127\,K$ and $1 \,atm$ pressure, a gaseous mixture of $CO$ and $CO_2$ in equilibrium with solid carbon has $90.55\%\, CO$ by mass, $ {C_{(s)} +CO2_{(g)} <=> 2CO_{(g)}}$ $K_c$ for this reaction at the above temperature is
At $473\,K$, $K_c$ for the reaction $ {PCl_{5(g)}<=>PCl_{3(g)} +Cl_{2(g)}}$. What will be the value of $K_c$ for the formation of $PCl_5$ at the same temperature?