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Chemistry
List of top Chemistry Questions asked in JEE Main
Sodium metal on dissolution in liquid ammonia gives a deep blue solution due to the formation of:
JEE Main - 2019
JEE Main
Chemistry
GROUP 1 ELEMENTS
For the following reactions, equilibrium constants are given :
$S\left(s\right)+O_{2}\left(g\right) $
${\rightleftharpoons}$
$SO_{2}\left(g\right); K_{1} =10^{52}$
$2S\left(s\right)+3O_{2}\left(g\right) $
${\rightleftharpoons}$
$2SO_{3}\left(g\right); K_{2} = 10^{129}$
The eqilibrium constant for the reaction,
$2SO_{2}\left(g\right)+O_{2}\left(g\right)$
${\rightleftharpoons}$
$2SO_{3}\left(g\right)$
is :
JEE Main - 2019
JEE Main
Chemistry
Equilibrium
$ {Mn_2(CO)_{10}}$ is an organometallic compound due to the presence of :
JEE Main - 2019
JEE Main
Chemistry
coordination compounds
A solution containing $62\, g$ ethylene glycol in $250 \,g$ water is cooled to $-10^{\circ}C$. If $K_f$ for water is $1.86\, K\, kg \,mol^{-1}$, the amount of water (in g) separated as ice is :
JEE Main - 2019
JEE Main
Chemistry
Solutions
What would be the molality of
$20\%$
(mass / mass) aqueous solution of
$KI$
? (molar mass of
$KI = 166\, g\, mol^{-1}$
)
JEE Main - 2019
JEE Main
Chemistry
Solutions
Haemoglobin and gold sol are examples of :
JEE Main - 2019
JEE Main
Chemistry
Surface Chemistry
The complex that has highest crystal feild splitting energy
$(\Delta )$
, is :
JEE Main - 2019
JEE Main
Chemistry
coordination compounds
The pair that does NOT require calcination is:
JEE Main - 2019
JEE Main
Chemistry
General Principles and Processes of Isolation of Elements
Hall-Heroult's process is given by :
JEE Main - 2019
JEE Main
Chemistry
General Principles and Processes of Isolation of Elements
$C_{60}$
, an allotrope of carbon contains :
JEE Main - 2019
JEE Main
Chemistry
p -Block Elements
Iodine reacts with concentrated
${HNO_3}$
to yield
$Y$
along with other products. The oxidation state of iodine in
$Y$
, is :
JEE Main - 2019
JEE Main
Chemistry
p -Block Elements
NaH is an example of :
JEE Main - 2019
JEE Main
Chemistry
hydrides
The compound that inhibits the growth of tumors is :
JEE Main - 2019
JEE Main
Chemistry
Importance and Applications of Coordination Compounds
Liquids
$A$
and
$B$
form an ideal solution in the entire composition range. At
$350\, K$
, the vapor pressures of pure
$A$
and pure
$B$
are
$7 \times 10^3$
Pa and
$12 \times 10^3\, Pa$
, respectively. The composition of the vapor in equilibrium with a solution containing
$40$
mole percent of
$A$
at this temperature is :
JEE Main - 2019
JEE Main
Chemistry
Solutions
The metal d-orbitals that are directly facing the ligands in $ {K_3[Co(CN)_6]}$ are :
JEE Main - 2019
JEE Main
Chemistry
coordination compounds
The mass of a non-volatile, non-electrolyte solute (molar mass
$= 50\, g\, mol^{-1}$
) needed to be dissolved in
$114\, g$
octane to reduce its vapour pressure to
$75\%,$
is :
JEE Main - 2018
JEE Main
Chemistry
Solutions
For
$1$
molal aqueous solution of the following compounds, which one will show the highest freezing point ?
JEE Main - 2018
JEE Main
Chemistry
Solutions
The trans-alkenes are formed by the reduction of alkynes with :
JEE Main - 2018
JEE Main
Chemistry
Hydrocarbons
The predominant form of histamine present in human blood is
$(pK_a$
Histidine
$= 6.0)$
JEE Main - 2018
JEE Main
Chemistry
Amines
The major product obtained in the following reaction is
JEE Main - 2018
JEE Main
Chemistry
Aldehydes, Ketones and Carboxylic Acids
Phenol on treatment with $CO_2$ in the presence of $NaOH$ followed by acidification produces compound $X$ as the major product. $X$ on treatment with $(CH_3CO)_2O$ in the presence of catalytic amount of $H_2SO_4$ produces :
JEE Main - 2018
JEE Main
Chemistry
Alcohols, Phenols and Ethers
Phenol reacts with methyl chloroformate in the presence of $NaOH$ to form product $A, A$ reacts with $Br_2$ to form product $B. A$ and $B$ are respectively :
JEE Main - 2018
JEE Main
Chemistry
Alcohols, Phenols and Ethers
The incorrect statement is :
JEE Main - 2018
JEE Main
Chemistry
d block elements
The correct order of spin-only magnetic moments among the following is : (Atomic number : Mn=25, Co=27, Ni=28, Zn=30)
JEE Main - 2018
JEE Main
Chemistry
properties of d block elements
Glucose on prolonged heating with
$HI$
gives :
JEE Main - 2018
JEE Main
Chemistry
Biomolecules
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