List of top Chemistry Questions

In a buffer solution containing equal concentration of $ B^- $ and HB, the $ K_b $ for $ B^- $ is $ 10^{-10} $ . The pH of buffer solution is

What is $ [H^+] $ in mol/L of a solution that is $0.20 \,M$ in $ CH_3COONa $ and $0.10 \,M$ in $ CH_3COOH $ ? $ (K_a\, \, for\, \, CH_3COOH = 1.8 \times 10^{-5}) $

A mixture of $CaCl_2$ and $NaCl$ weighing $4.44\, g$ is treated with sodium carbonate solution to precipitate all the calcium ions as calcium carbonate. The calcium carbonate so obtained is heated strongly to get $0.56\, g$ of $CaO$. The percentage of $NaCl$ in the mixture is (Atomic mass of $Ca = 40)$

In Kjeldahl's method, ammonia from $5\, g$ of food neutralizes $30 \,cm^3$ of $0.1\, N$ acid. The percentage of nitrogen in the food is

In the electrolytic refining of Zinc ,.................

: One molar aqueous solution has always higher concentration than one molal. : The molality of a solution depends upon the density of the solution whereas molarity does not.

The species which by definition has zero standard molar enthalpy of formation at $298 \,K$ is

Among the following, intensive property is (properties are)

Which one of the following species does not exist under normal conditions?

The packing efficiency of the two-dimensional square unit cell shown below is

In alkaline medium, glycine exists predominantly as

Reaction of chloroform with $KOH$ in the presence of a primary aromatic amine is called

Which one of the following conversions involve change in both hybridization and shape?

The sugar present in milk is__________

For the reversible reaction $A_{(s)}+B_{(g)} \rightleftharpoons C_{(g)}+D_{(g)}: \Delta G^{0}=-350 kJ .$ Which one of the following statements is true?

In $ HCO{{O}^{-}} $ , the two carbon-oxygen bonds are found to be of equal length. What is the reason for this?

For the reaction, $2 A(g)+B_{2}(g) \rightleftharpoons 2 A B_{2}(g)$ the equilibrium constant, $K_{p}$ at $300\, K$ is $16.0$. The value of $K_{p}$ for $A B_{2}(g) \rightleftharpoons A(g)+1 / 2 B_{2}(g)$ is

For which one of the following reactions will there be a positive $\Delta S$ ?

Reaction of methyl bromide with aqueous sodium hydroxide involves

The correct IUPAC name of $K_2[Ni(CN)_4]$ is _______

The amount of heat evolved when $500 \,cm^3$ of $0.1 \,M \,HCl$ is mixed with $200\, cm^3$ of $0.2\,M \,NaOH$ is _______

The empirical formula of a non-electrolyte is $CH_2O$. A solution containing $6 \,g$ of the compound exerts the same osmotic pressure as that of $0.05\, M$ glucose solution at the same temperature. The molecular formula of the compound is

The spin only magnetic moment of $Mn^{+4}$ ion is nearly____

The set of quantum numbers for the outermost electron for copper in its ground state is ___________

$P_4O_{10}$ is the anhydride of