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Chemistry
List of top Chemistry Questions
The de Broglie wavelength of a particle with mass 1 kg and velocity 100 m/s is
JIPMER - 2011
JIPMER
Chemistry
Structure of atom
: 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.
AIIMS - 2011
AIIMS
Chemistry
Colligative Properties
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
WBJEE - 2011
WBJEE
Chemistry
Electrochemistry
$2\,gm$
of metal carbonate is neutralized completely by
$100 \,mL$
of
$0.1 \,(N) \,HCl$
. The equivalent weight of metal carbonate is
WBJEE - 2011
WBJEE
Chemistry
Some basic concepts of chemistry
The pH of an aqueous solution of
$CH_3COONa$
of concentrated
$C(M)$
is given by
WBJEE - 2011
WBJEE
Chemistry
Equilibrium
$20\, mL$
of
$0.2\, M \,NaOH$
is added to
$50\, mL$
of
$0.2\, M$
acetic acid. The pH of this solution after mixing is
$(Ka = 1.8 \times 10^{-5})$
WBJEE - 2011
WBJEE
Chemistry
Acids and Bases
The normality of $30$ volume $H_2O_2$ is
WBJEE - 2011
WBJEE
Chemistry
Mole concept and Molar Masses
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
NEET (UG) - 2011
NEET (UG)
Chemistry
Uncertainty in Measurement
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 -
NEET (UG) - 2011
NEET (UG)
Chemistry
Solutions
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?
NEET (UG) - 2011
NEET (UG)
Chemistry
coordination compounds
Two soap bubbles of radii $x$ and $y$ coalesce to constitute a bubble of radius $z$. Then $z$ is equal to
WBJEE - 2011
WBJEE
Chemistry
Gas laws
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
WBJEE - 2011
WBJEE
Chemistry
Equilibrium
The Lassaigne's extract is boiled with conc.
$HNO_3$
while testing for halogens. By doing so it
NEET (UG) - 2011
NEET (UG)
Chemistry
Methods Of Purification Of Organic Compounds
$CH_{3} - \overset{\underset{||}{O}}{C} - CH_{3} \ce{->[{SeO_{2}}]} X +Se +H_{2}O : X$ is
VITEEE - 2011
VITEEE
Chemistry
Chemical Reactions
$"925$
fine silver" means an alloy of
VITEEE - 2011
VITEEE
Chemistry
General Principles and Processes of Isolation of Elements
$CH_3CH_2Br$
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.
VITEEE - 2011
VITEEE
Chemistry
Alkanes
$200 \,mL$
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 (
$R = 0.083 \, L\, bar\, mol^{-1} \, K^{-1}$
):
NEET (UG) - 2011
NEET (UG)
Chemistry
Solutions
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?
NEET (UG) - 2011
NEET (UG)
Chemistry
States of matter
Of the following which one is classified as polyester polymer?
NEET (UG) - 2011
NEET (UG)
Chemistry
Polymers of Commercial Importance
The unit of rate constant for a zero order reaction is -
NEET (UG) - 2011
NEET (UG)
Chemistry
Order of Reaction
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.
$Cr = 24, Mn = 25, Fe = 26,Co = 27$
)
NEET (UG) - 2011
NEET (UG)
Chemistry
d -and f -Block Elements
The Van't Hoff factor
$I$
for a compound which undergoes dissociation in one solvent and association in other solvent is respectively :
NEET (UG) - 2011
NEET (UG)
Chemistry
Colligative Properties
The ultimate source of energy in biosphere is
OJEE - 2011
OJEE
Chemistry
Environmental Chemistry
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
NEET (UG) - 2011
NEET (UG)
Chemistry
Electrochemistry
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
Delhi UMET/DPMT - 2011
Delhi UMET/DPMT
Chemistry
Chemical Kinetics
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