List of top Chemistry Questions

The de Broglie wavelength of a particle with mass 1 kg and velocity 100 m/s is

: Higher the molal depression constant of the solvent used, higher the freezing point of the solution. : Depression in freezing point does not depend on the nature of the solvent.

The standard reduction potential $E^o$ for half reations are $Zn = Zn^{2+} + 2e^- ;\,\,E^o = +0.76 V$ $Fe = Fe^{2+} + 2e^-;\,\, E^o = + 0.41 V$ The EMF of hte cell reaction $Fe^{2+} + Zn = Zn^{2+} + Fe$ is

$2\,gm$ of metal carbonate is neutralized completely by $100 \,mL$ of $0.1 \,(N) \,HCl$. The equivalent weight of metal carbonate is

The pH of an aqueous solution of $CH_3COONa$ of concentrated $C(M)$ is given by

$20\, mL$ of $0.2\, M \,NaOH$ is added to $50\, mL$ of $0.2\, M$ acetic acid. The pH of this solution after mixing is $(Ka = 1.8 \times 10^{-5})$

The normality of $30$ volume $H_2O_2$ is

The density of a material in $CGS$ system of units is $4\,g\,cm^3$. In a system of units in which unit of length is $10\,cm$ and unit of mass is $100\,g$. the value of density of material will be

A 0.1 molal aqueous solution of a weak acid is 30% ionized. If $K_f$ for water is $ 1.86^{\circ} C/m$, the freezing point of the solution will be -

The complexes $[Co(NH_3)_6][Cr(CN)_6]$ and $[Cr(NH_3)_6][Co(CN)_6]$ are the examples of which type of isomerism?

Two soap bubbles of radii $x$ and $y$ coalesce to constitute a bubble of radius $z$. Then $z$ is equal to

If the equilibrium constants of the following equilibria ${SO_{2(g)} +\frac{1}{2}O2 <=> SO3$ $ and\, 2SO_{3(g)} <=> 2SO_{2(g)} +O_{2(g)}}$ are given by $K_1$ and $K_2$ respectively, which of the following relations is correct

The Lassaigne's extract is boiled with conc. $HNO_3$ while testing for halogens. By doing so it

$CH_{3} - \overset{\underset{||}{O}}{C} - CH_{3} \ce{->[{SeO_{2}}]} X +Se +H_{2}O : X$ is

$"925$ fine silver" means an alloy of

$CH_3CH_2Br$ undergoes Wurtz reaction. We may expect some of the following product $A : CH_3CH_2CH_2CH_3$ $B : CH_2 = CH_2$ $C : CH_3 ? CH_3$ Select correct product.

$200 \,mL$ of an aqueous solution of a protein contains its $1.26\, g$. The Osmotic pressure of this solution at $300\, K$ is found to be $2.57 \times 10^{-3}$ bar. The molar mass of protein will be ($R = 0.083 \, L\, bar\, mol^{-1} \, K^{-1}$):

A bubble of air is underwater at temperature $15^{\circ}C$ and the pressure $1.5 \,bar$. If the bubble rises to the surface where the temperature is $25^{\circ}C$ and the pressure is $1.0\, bar$, what will happen to the volume of the bubble?

Of the following which one is classified as polyester polymer?

The unit of rate constant for a zero order reaction is -

For the four successive transition elements $(Cr, Mn, Fe$ and $Co)$ , the stability of $+ 2$ oxidation state will be there in which of the following order? (At. no. $Cr = 24, Mn = 25, Fe = 26,Co = 27$ )

The Van't Hoff factor $I$ for a compound which undergoes dissociation in one solvent and association in other solvent is respectively :

The ultimate source of energy in biosphere is

Standard electrode potential of three metals $X, Y $ and $Z$ are $-1.2\,V, + 0.5\,V$ and $-3.0\,V $respectively. The reducing power of these metals will be

A chemical reaction proceeds into the following steps Step I,$\hspace15mm 2A \rightleftharpoons X$ fast Step II,$\hspace10mm X + B \rightleftharpoons Y$ slow Step III,$\hspace10mm Y + B \rightleftharpoons $ Product fast The law for the overall reaction is