Which one of the following sets of quantum numbers represents the highest energy level in an atom?
n = 4; l = 0; m = 0; s = +
n = 3; l = 1; m = 1; s = +
n = 3; l = 2; m = -2; s = +
n = 3; l = 0; m = 0; s = +
For the homogeneous reaction,
4NH3 + 5O2 4NO + 6H2O
the equilibrium constant Kc has the units
conc.+10
conc.+1
conc.-1
it is dimensionless
The correct order of decreasing first ionisation energy is
C > B > Be > Li
C > Be > B > Li
B > C > Be > Li
Be > Li > B > C
Consider the following reaction,
C6H5NO2 X Y + HCl
What is Y?
Acetanilide
Benzinilide
Azobenzene
Hydrazobenzene
Ammonia is a Lewis base and it forms complexes with many cations. Which one of the following cations does not form a complex with ammonia?
Ag+
Cu2+
Cd2+
Pb2+
Argol, a brown crust, formed during the fermentation of grape juice contains
CO2
fused oil
potassium hydrogen tartarate
lye
The pH value of 0.001 M aqueous solution of NaCl is
7
4
11
unpredictable
A.
7
NaCl is a neutral salt, thus the pH value of its aqueous solution is 7.
Which buffer solution comprising of the following has its pH value greater than 7?
CH3COOH + CH3COONa
HCOOH + HCOOK
CH3COONH4
NH4OH + NH4Cl