List of top Chemistry Questions

If the ionisation energy and electron affinity of an element are $275$ and $86 \,kcal\, mol^{-1}$ respectively, then the electronegativity of the element on the Mulliken scale is

Caffeine has a molecular weight of $194\, u$. If it contains $28.9\%$ by mass of nitrogen, number of atom of nitrogen in one molecule of caffeine is

Which of the following reactions is used to prepare isobutane ?

With excess of water, both $P_{2}O_{5}$ and $PCl_{5}$ give

Which one of the following is a case of negative adsorption?

$X Cl _{2}( excess )+Y Cl _{2} X Cl _{4}+Y \downarrow$ $Y O {->[{\Delta}][{>400^{\circ} C }]} \frac{1}{2} O _{2}+Y$ Ore of Y would be ,

Which one of the following monomers form biodegradable polymer?

$0.06\%\, (w/v)$ aqueous solution of urea is isotonic with

Cobalt (III) chloride forms several octahedral complexes with ammonia. Which of the following will not give test for chloride ions with silver nitrate at $25^{\circ } C$?

The hybridization involved in complex $ {[Ni(CN)4]^{2-}}$ is (At.No. Ni = 28)

The sum of coordination number and oxidation number of the metal M in the complex \([M(en)_2(C_2O_4)]Cl\) (where en is ethylenediamine) is :-

Nitrogen dioxide and sulphur have some properties in common. Which property is shown by one of these compounds, but not by the other?

The rate constant of the reaction $ A \to B$ is $0.6 \times 10^{-3}$ mole per second. If the concentration of A is 5 M, then concentration of $B$ after 20 minutes is :

Point out incorrect stability order

The molarity of $NO_3^-$ in the solution after $2L$ of $3M \, AgNO_3$ is mixed with $3L$ of $1M \, BaCl_2$ is

The chemical composition of slag formed during the smelting process in the extraction of copper is

If the equilibrium constant for ${ N2(g) + O2(g) <=> 2NO(g)}$ is K, the equilibrium constant for ${ \frac{1}{2} N_2 (g) + \frac{1}{2} O_2 (g) <=> NO(g) }$ will be :

What is the pH of the resulting solution when equal volumes of $0.1\, M \,NaOH$ and $0.01\, M$ $HCl$ are mixed ?

The two electrons have the following set of quantum numbers: $P = 3 , 2 , - 2 , + \frac {1}{2}$ $Q = 3,0,0,+\frac {1}{2}$ Which of the following statement is true ?

The electrolyte having maximum flocculation value for $AgI/Ag^+$ sol is

On heating with concentrated $NaOH$ solution in an inert atmosphere of $CO_2$ white phosphorous gives a gas. Which of the following statement is incorrect about the gas ?

In $H_2 - O_2$ fuel cell the reaction occurring at cathode is

How many ions per molecule are produced in the solution when Mohr salt is dissolved in excess of water ?

Which one of the following electrolytes has the same value of van't Hoff's factor (i) as that of $ {Al_2(SO_4)_3}$ (if all are 100% ionised) ?

$ : CCl_2 $ is