Which of the following does not result in an increase in entropy?
Crystallisation of sucrose form a solution
Rusting of iron
Conversion of ice ofwater
Vaporisation of camphor
In the modern periodic table the place of the element with atomic number 31 is in
s- block
d-block
p- block
f- block
Which of the following does not exhibit the periodicity in properties of the elements?
Ionisation energy
n/p ratio
Electronegativity
Atomic radius
The correct sequence of decrease in size of the following species is
I> I+> I-
I> I-> I+
I+> I-> I
I-> I> I+
The decreasing order of the ionisation potential in the following elements is
Ne> Cl>P> S>Al>Mg
Ne> Cl> P> S> Mg> Al
Ne> Cl> S>P> Mg> Al
Ne> Cl> S>P> Al> Mg
B.
Ne> Cl> P> S> Mg> Al
Along the period from left to right ionisation potential increases.
Exception
(a) Ist ionisation potential of group IIA elements are always higher than Ist ionisation potential of group IIIA elements.
(b) Ist ionisation potential of group VA elements are always higher than Ist ionisation potential ofgroup VIA elements. So, the sequence isNe > Cl > P > S > Mg > Al.
Which of the following represents the electronic configuration of the most electropositive element?
[He]2s1
[He]2s2
[Xe]6s1
[Xe]2s2
Which of the following reactions is a redox reaction?
2AgNO3 + BaCl2 → 2AgCl + Ba(NO3)2
BaO2 + H2SO4 → BaSO4 + H2O2
P2O5 + 2H2O → H4P2O7
Cu + 2AgNO3 → 2Ag + Cu(NO3)2