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
C.
p- block
Electronic configuration of element having atomic number 31 is 1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d10, 4p1.
Therefore p-block element.
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