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

The rate of a chemical reaction doubles for every 10� rise in temperature. If the temperature increases by 60�, the rate of reaction increases

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?

100 mL of N/5 HCl was added to 1 g of pure $ {CaCO_3}$ What would remain after the reaction?

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

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