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Chemistry
List of top Chemistry Questions
A weather balloon filled with hydrogen at 1 atm and 27
$^\circ$
C has volume equal to 1200 litres. On ascending, it reaches a place where temperature is -23
$^\circ$
C and pressure is 0.5 atm. The volume of the balloon is
Chemistry
States of matter
Which of the following contribute towards photochemical smog formation?
Chemistry
Environmental Chemistry
Saline soil contains
Chemistry
Environmental Chemistry
Ultraviolet radiation from sun causes a reaction that produces
Chemistry
Environmental Chemistry
Most hazardous metal pollutant of automobile exhausts is
Chemistry
Environmental Chemistry
Taj may be destroyed by
Chemistry
Environmental Chemistry
Which of the following is/are the main agents of soil erosion?
Chemistry
Environmental Chemistry
Classical Smog is also known as
Chemistry
Environmental Chemistry
Ozone layer of upper atmosphere is being destroyed by
Chemistry
Environmental Chemistry
Increased asthmatic attacks in certain seasons are related to
Chemistry
Environmental Chemistry
Which one of the following dissolves more rapidly in blood haemoglobin than oxygen ?
Chemistry
Environmental Chemistry
A type of zeolite used to convert alcohols directly into gasoline is
Chemistry
p -Block Elements
A translucent white waxy solid
$(A)$
reacts with excess of chlorine to give a yellowish white powder
$(B)$
.
$(B)$
reacts with organic compounds containing
$-OH$
group converting them into chloro derivatives.
$(B)$
on hydrolysis gives
$(C)$
and is finally converted to phosphoric acid.
$(A)$
,
$(B)$
and
$(C)$
are
Chemistry
p -Block Elements
A system has internal energy equal to
$E_1$
, 450 J of heat is taken out of it and 600 J of work is done on it. The final energy of the system will be
Chemistry
Thermodynamics
$A$
system absorbs
$50 \,kj$
heat and does
$20\, kj$
of work. What is the net change in the internal energy of the system?
Chemistry
Thermodynamics
A suspension of
$Ca(OH)_2$
in water is called
Chemistry
GROUP 1 ELEMENTS
A standard hydrogen electrode has a zero potential because
Chemistry
Electrochemistry
A solution of a compound
$X$
in dilute
$HCl$
on treatment with a solution of
$BaCl_2$
gives a white precipitate of a compound
$Y$
which is insoluble in cone.
$HNO_3$
and conc.
$HCl$
. Compound
$X$
imparts golden yellow colour to the flame. $\underset{\text{(imparts golden yellow colour)}}{ {X (Solution \,in \,dilute HCl) }}
$ $
+\, {BaCl2 -> }
$$
\underset{\text{Whit ppt}}{ {Y}}
$ $
{->[\text{Conc}. HNO_3][\text{Conc}.HCl] Insoluble}$ What are compounds
$X$
and
$Y$
?
Chemistry
GROUP 1 ELEMENTS
A solution of 10 ml
$\frac{M}{10} {FeSO_4}$
was titrated with
$ {KMnO_4}$
solution in acidic medium. The amount of
$ {KMnO_4}$
used will be :
Chemistry
Redox reactions
A solid
$X^{+} Y^{-}$
has a bee structure. If the distance of closest approach between the two atoms is 173 pm, the edge length of the cell is
Chemistry
The solid state
A solution containing 0.319 g of
$CrCl_3?6H_2O$
was passed through a certain exchange resin and acid coming of cation exchange resin required 28.5 mL of 0.125 M NaOH. The correct formula of complex is (mol. wt. of complex = 266.7)
Chemistry
coordination compounds
A solid is made of two elements
$X$
and
$Z$
. The atoms
$Z$
are in
$ccp$
arrangement while atoms
$X$
occupy all the tetrahedral sites. What is the formula of the compound ?
Chemistry
The solid state
A sample of
$O_2$
gas is collected over water at
$23 ^{\circ}C$
at a barometric pressure of
$751\, mm\, Hg$
(vapour pressure of water at
$23^{\circ}C$
is
$21\, mm\, Hg$
).The partial pressure of
$O_2$
gas in the sample collected is
Chemistry
States of matter
A real gas obeying van der Waal equation will resemble ideal gas if the
Chemistry
States of matter
A primary alkyl halide would prefer to undergo
Chemistry
Haloalkanes and Haloarenes
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