List of top Chemistry Questions

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

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 ?

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 ?

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

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

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

An alkali metal hydride $(NaH)$ reacts with diborane in $A$ to give a tetrahedral compound $B$ which is extensively used as reducing agent in organic synthesis. The compounds $A$ and $B$ respectively are

Which of the following will be able to show geometrical isomerism ?

How many Coulombs of electricity are required for the oxidation of one mol of water to dioxygen ?

In presence of $HCl, H_2S$ results the precipitation of Group-2 elements but not Gp-4 elements during qualitative analysis. It is due to

Which of the following compound possesses the "C - H" bond with the lowest bond dissociation energy ?

While charging the lead storage battery

The formation of cyanohydrin from a ketone is an example of

Which one of the following is an allylic halide ?

The salt which responds to dilute and concentrated $H_2SO_4$ is

Copper is extracted from Copper pyrites by heating in a Bessemer converter. The method is based on the principle that

Using MOT, compare $O_2^+$ and $O_2^-$ species and choose the incorrect option.

One of the following amide will not undergo Hoffmann bromamide reaction :

In a first order reaction, the concentration of the reactant is reduced to $12.5\%$ in one hour. When was it half completed ?

The RMS velocity of $CO$ gas molecules at $27^{\circ}$C is approximately $1000\, m/s$. For $N_2$ molecules at $600 \,K$ the RMS velocity is approximately

For the reaction $A+2 B \longrightarrow C$, the reaction rate is doubled, if the concentration of $A$ is doubled. The rate is increased by four times when concentrations of both $A$ and $B$ are increased by four times. The order of the reaction is

Addition of sodium thiosulphate solution to a solution of silver nitrate gives $X$ as white precipitate, insoluble in water but soluble in excess thiosulphate solution to give $Y$. On boiling in water, $Y$ gives $Z . X, Y$ and $Z$ respectively are

For the given reaction, $H _{2}( g )+ Cl _{2}( g )->2 H ^{+}( aq )+2 Cl ^{-}( aq ) ; \Delta G ^{\circ}=--262 \cdot 4 kJ$ The value of free energy of formation $\left(\Delta G_{f}^{\circ}\right)$ for the ion $C l^{-1}(a q)$, therefore will be

Metal carbonyls are stable due to