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
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
D.
Cu + 2AgNO3 → 2Ag + Cu(NO3)2
In reaction, Cu + 2AgNO3 → 2Ag + Cu(NO3)2
In the above reaction oxidation number of Cu change from 0 to +2. Hence, Cu is oxidised to Cu2+ and oxidation number of Ag changes from +1 to 0. Hence, Ag is reduced.
In other reactions oxidation number of element remain same before and after the reaction.