List of top Chemistry Questions

At $25^{\circ} C$, the dissociation constant of a base, $BOH$, is $1.0 \times 10^{-12}$. The concentration of hydroxyl ions in $0.01\, M$ aqueous solution of the base would be

Equilibrium constants $ K_{1}$ and $ K_{2} $ for the following equilibria

$H_{2}S $ gas when passed through a solution of cations containing $ HCl $ precipitates the cations of second group of qualitative analysis but not those belonging to the fourth group. It is because:

The solubility product of $ BaC{{l}_{2}} $ is $ 4\times {{10}^{-9}}. $ Its solubility in mol/L is

For the reaction, $H _{2}+ I _{2} \rightleftharpoons 2 HI$, the equilibrium concentration of $H _{2}, I _{2}$ and $HI$ are $8.0, 3.0$ and $28.0 \,mol / L$ respectively. The equilibrium constant is

Reaction $BaO _{2}( s ) \rightleftharpoons BaO ( s )+ O _{2}(g)$ . In equilibrium condition, pressure of $O_{2}$ depends on

Solubility of $M X_{2}$-type electrolytes is $0.5 \times 10^{-4}$ $mol / L$ Then find out $K_{s p}$ of electrolytes

Which has highest pH?

Solution of $0.1\, N\, NH _{4} OH$ and $0.1\, N\, NH _{4} Cl$ has $pH 9.25$, then find out $pK _{ b }$ of $NH _{4} OH$.

The $pK_a$ of a weak acid (HA) is 4.5. The pOH of an aqueous buffered solution of HA in which $50\%$ of the acid is ionized is

Styrene can be purified by

Glauber salt is

Plexiglass is a commercial name of

Value of $x$ in potash alum, $K_2SO_4\cdot Al_x(SO_4)_3\cdot 24H_2O$ is

In the following reaction, The produce X is

The temperature of sink of a Carnot engine is 27?C. If the efficiency of engine be 25%, then the temperature of source must be

In producing chlorine through electrolysis 100 W power at 125 V is being consumed. How much chlorine per min is liberated? Electro chemical equivalent of chlorine is $ 0.367\,\times {{10}^{-6}}\,kg/C $ .

Regeneration in Hydra will be faster if it is cut off from

Rayon is

Propene on hydroboration and oxidation produces

Sodium formate on heating gives

Hydrolysis ofphenyl isocyanide forms

Lucas reagent is

When dihydroxy acetone reacts with $HI0_4$, the product is/are

Freon used as refrigerant is