The decomposition of a certain mass of CaCO3 gave 11.2 dm3 of CO2 gas at STP. The mass of KOH required to completely neutralise the gas is :
56 g
28 g
42 g
20 g
0.06 mole of KNO3 solid is added to 100 cm3 of water at 298K. The enthalpy of KNO3 aqueous solution is 35.8 kJ mol-1. After the solute is dissolved the temperature of the solution will be:
293 K
298 K
301 K
304 K
4 moles each of SO2 and O2 gases are allowed to react to form SO3, in a closed vessel. At equilibrium 25% of O2 is used up. The total number of moles of all the gases at equilibrium is :
6.5
7.0
8.0
2.0
ΔG° vs T plot in the Ellingham's diagram slopes upwards for the reactions:
Mg+ 1/2O2 → MgO
2Ag + 1/2O2 → Ag2O
C + 1/2O2 → CO
CO + 1/2O2 → CO2
Which of the following is diamagnetic?
H
O2
Li2
He
C.
Li2
Molecules or ion having no unpaired electrons are diamagnetic e.g.,
Solubility product of a salt AB is 1 x 10-8 M2 in a solution in which the concentration of A+ ions is 10M.The salt will precipitate when the concentration of B ions is kept :
between 10-8 M to 10-7 M
between 10-7 M to 10-8 M
>10-5 M
<10-8 M