Which of the following sets of qunatum numbers correct?
n =5, l=4, m=0, s=+1/2
n= 3, l=3, m=+3, s= +1/2
n=6, l=0, m=+1, s= =1/2
n=4, l= 2, m=+2, s=0
The pair of elements having approximately equal ionisation potential is
Al, Ga
Al, Si
Al, Mg
Al, B
Water is well known amphoprotic solvent. In which chemical reaction water is behaving as a base?
H2SO4 + H2O → H3O+ + HSO
H2O + H2O → H3O+ + OH-
H2O + NH → NH3 + OH-
H2O + NH3 → NH + OH-
Which of the following is not a equilibrium ?
Ice Water
I2(s) I2(g)
S (l) S (g)
3O2 2O3
D.
3O2 2O3
When a compound or element exists in different phases (states), a physical equilibrium exists between them.
O2 and O3 are the allotropes of oxygen, ie, have different composition, so the equilibrium exist between them is considered as chemical equilibrium.
2.5 L of NaCl solution contain 5 moles of the solute. What is the molarity ?
5 M
2 M
2.5 M
12.5 M
The entropy of a perfectly crystalline material is zero at 0°C. This is statement of
first law of thermodynamics
second law of thermodynamics
third law of thermodynamics
law of conservation of energy
When a metal atom combines with a non-metal atom, the non-metal atom will
lose electrons and decrease in size
lose electrons and increase in size
gain electrons and decrease in size
gain electrons and increase in size