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Chemistry
List of top Chemistry Questions
The best coagulant for the precipitation of
$Fe ( OH )_{3}$
is
JKCET - 2011
JKCET
Chemistry
Colloids
Zeigler-Natta catalyst is used to prepare
KEAM - 2011
KEAM
Chemistry
Polymers
Two oxides of a metal contain
$36.4 \%$
and
$53.4 \%$
of oxygen by mass respectively. If the formula of the first oxide is
$M _{2} O$
, then that of the second is
JKCET - 2011
JKCET
Chemistry
Laws of Chemical Combinations
The standard enthalpy of formation of $C_2H_{4(g)}, CO_{2(g)}$ and $H_2O_{(l)}$ are $52, -394$ and $-286\, kJ\, mol^{-1}$ respectively. Then the amount of heat evolved by burning $7\, g$ of $C_2H_{4(g)}$ is
JKCET - 2011
JKCET
Chemistry
Thermodynamics
Chemically unreactive three different gases
$A, B$
and
$C$
of molecular masses
$16, 32$
and
$64$
are enclosed in a vessel at constant temperature till equilibrium is reached. Which of the following statements is true?
JKCET - 2011
JKCET
Chemistry
States of matter
When
$6.3\, g$
of sodium bicarbonate are added to
$30.0\, g$
of acetic acid solution, the residual solution is found to weigh
$33.0\, g$
. The mass of carbon dioxide released in the reaction is
JKCET - 2011
JKCET
Chemistry
Some basic concepts of chemistry
According to kinetic theory of gases
JEE Advanced - 2011
JEE Advanced
Chemistry
States of matter
According to the Bohr Theory, which of the following transitions in the hydrogen atom will give rise to the least energetic photon?
NEET (UG) - 2011
NEET (UG)
Chemistry
Structure of atom
A solid compound
$XY$
has
$NaCl$
structure. If the radius of the cation is
$100\, pm$
, the radius of the anion
$(Y^-)$
will be -
NEET (UG) - 2011
NEET (UG)
Chemistry
The solid state
Which one of the following is present as an active ingredient in bleaching powder for bleaching action?
NEET (UG) - 2011
NEET (UG)
Chemistry
GROUP 1 ELEMENTS
The complex,
$[Pt(Py)(NH_3)Br\,Cl]$
will have how many geometrical isomers?
NEET (UG) - 2011
NEET (UG)
Chemistry
coordination compounds
The rms velocity of hydrogen is
$\sqrt {7}$
times the rms velocity of nitrogen. If
$T$
is the temperature of the gas, which of the following is true?
KCET - 2011
KCET
Chemistry
States of matter
Oxidative rancidity of oils can be prevented by adding
COMEDK UGET - 2011
COMEDK UGET
Chemistry
Chemistry in Everyday Life
The dissociation constant of a weak base is
$ {1 \times 10^{-5}}$
at 25?C. The pH of its 0.1 M solution at the same temperature.will be .
COMEDK UGET - 2011
COMEDK UGET
Chemistry
Acids and Bases
ln cuprarnmonium sulphate, copper is
COMEDK UGET - 2011
COMEDK UGET
Chemistry
coordination compounds
Isopropyl chloride and isobutyl chloride reacts with sodium in ether to give?
COMEDK UGET - 2011
COMEDK UGET
Chemistry
Hydrocarbons
The conjugate acid of
$ {HCO_3^-}$
is
COMEDK UGET - 2011
COMEDK UGET
Chemistry
Acids and Bases
Methoxymethane and ethanol exhibit
COMEDK UGET - 2011
COMEDK UGET
Chemistry
Alcohols, Phenols and Ethers
The decarboxylating agent is
COMEDK UGET - 2011
COMEDK UGET
Chemistry
GROUP 1 ELEMENTS
According to Lewis concept, an acid is a/an
COMEDK UGET - 2011
COMEDK UGET
Chemistry
Equilibrium
Aldol condensation is given by
COMEDK UGET - 2011
COMEDK UGET
Chemistry
Aldehydes, Ketones and Carboxylic Acids
The compound which gives hydrocarbon on distillation with zinc dust is
COMEDK UGET - 2011
COMEDK UGET
Chemistry
Chemical Reactions
As we move from left to right in the 3d-series elements
COMEDK UGET - 2011
COMEDK UGET
Chemistry
Classification of elements and periodicity in properties
Following is the substitution reaction in which
\(-CN\)
replaces
\(-Cl\)
\(R - CI + KCN \overset{\Delta}{\rightarrow} R - CN + KCI\)
To obtain propane nitrile,
\(R-Cl\)
should be:
KCET - 2011
KCET
Chemistry
Haloalkanes and Haloarenes
Which of the two ions from the list given below, have the geometry that is explained by the same hybridisation of orbitals
$NO^- _ 2 ,NO_3^- , NH_2^- , NH_4^+,SCN ^- ?$
AIPMT - 2011
AIPMT
Chemistry
Chemical bonding and molecular structure
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