List of top Chemistry Questions asked in COMEDK UGET

Sodium cyanide is added as a depressant in the froth floatation process when the ore contains a mixture of $ {ZnS}$ and $ {PbS}$. This is because
The non existence of $PbI_4$ and $PbBr_4$ is due to
Sodium dissolves in liquid $NH_3$ to give a deep blue solution. This is due to
The complex $ {[Ag(NH_3)_2][Ag(CN)_2]}$ has the IUPAC name
The mole fraction of dioxygen in a neon-dioxygen mixture is $0.18$. If the total pressure of the mixture is $25$ bar, the partial pressure of neon in the mixture would be
The reaction, $ { CH_3CH_2I + KOH_{(aq)} -> CH_3CH_2OH + KI}$ is classified as
An endothermic reaction, $A \to B$ has an activation energy as $x\, kJ/mol$. If the energy change of the reaction is $y\, kJ$, the activation energy of the reverse reaction is
The rate of a chemical reaction doubles for every 10� rise in temperature. If the temperature increases by 60�, the rate of reaction increases
Density of $3\,M$ solution of $NaCl$ is $1.25 \,g/mL$ The mass of the solvent in the solution is
One mole of $PCl_5$ is heated in a closed 2 $dm^3$ vessel. At equilibrium 40% $PCl_5$ is dissociated. Calculate the equilibrium constant.
Which of the following inert gas compounds is not formed?
Fullerene with formula $C_{60}$ has a structure where every carbon atom is
For all gases, at any given pressure, the graph of volume vs temperature (in celsius) is a straight line. This graph is called
100 mL of N/5 HCl was added to 1 g of pure $ {CaCO_3}$ What would remain after the reaction?
IUPAC name of $ {[CrCl_2(NH3)4]NO_3}$ is
The enthalpy of neutralization of HCI and NaOH is x kJ. The heat evolved when 500 ml of 2 N HCl is mixed with 250 mt of 4 N NaOH will be
Number of atoms in 560 $cm^3$ of oxygen at S.T.P. is
The volume of $CO_2$ (in $cm^3$) liberated at S.T.P. when 1.06 g of anhydrous sodium carbonate is treated with excess of dilute HCl is [atomic mass of Na= 23]
The temperature of one mole of an ideal gas increases from 298 K when it absorbs 200 J of heat at constant volume. The change in the internal energy of the gas is
The atomic number of the element with highest ionization energy among the following is
The heat of formation of $ {H_2O_{(l)}}$ is -286 kJ. The? heat of formation of $ { H_2O_{(g)}}$ is likely to be
In Lassaigne's test for nitrogen in an organic compound, the blue colouration is due to the formation of
Which one of the following ores is obtained by floatation process?
The oxidation number of oxygen is -1 in
For the dissociation of limestone in the slag zone of the blast furnace, the reaction is