In which of these groups will all the substances be insoluble in water?
Na2CO3, KNO3,(NH4)2C03
NaHCO3, PbSO4, CaSO4
K2C03, CaSO4, AgNO3
PbCl2, NaCl, ZnCl2
ZnCO3, BaSO4,AgCl
Correct answer is E
No explanation has been provided for this answer.
What is the maximum number of electrons that an f-orbital can accommodate?
2
6
7
10
14
Correct answer is E
No explanation has been provided for this answer.
A substance is said to be hygroscopic when it
absorbs atmospheric moisture and then goes into solution
absorbs atmospheric moisture but does not go into solution
changes colour
is not affected by atmospheric moisture
losses its water of crystallization
Correct answer is B
No explanation has been provided for this answer.
The electrode potential in volts of 2H+(aq) / H2(q) system is
-2.87
-2.71
0.8
1.68
Correct answer is E
No explanation has been provided for this answer.
Chromatography is used to separate components of mixtures which differ in their rates of
diffusion
migration
reaction
sedimentation
sublimation
Correct answer is B
No explanation has been provided for this answer.