List of top Chemistry Questions

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 of $Cu(NO_3)_2$ in water is acidic due to

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?

Conjugate base of $OH^-$ is

Consider the equilibrium set up: $ {2H2_{(g)} +CO_{(g)} <=> CH3OH_{(g)}}$ What will be the effect of the following on the equilibrium of the reaction? (i) Addition of $H_2$ (ii) Addition of $CH_3OH$ (iii) Removal of $CO$ (iv) Removal of $CH_3OH$

The amount of phosphorus present in $1.375\, g$ of $PCl_3$ is (atomic weight of $P = 31$, $Cl = 35.5$)

The formula for calcium chlorite is

${AgNO_3}$ does not decompose where :

Find the angular momentum of 4S? 

The lanthanide contraction relates to

Aluminium is used in thermite welding because-

Aluminium is obtained by