Classification of elements & Periodicity in properties Test

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Classification of elements & Periodicity in properties Test - 1

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is the correct order of increasing paramagnetism?

A
Cu < V < Mn < Cr

B
V < Cr < Mn < Cu

C
Cu < V < Cr < Mn

D
Cu < Mn < Cr < V

Solution

Configurations of Cu, V, Mn and Cr are respectively: [Ar] 3d^]0 4s¹[Ar] 3d³4s²(3 unpaired electrons), [Ar] 3d⁵4s²and [Ar] 3d⁵ 4s¹.
Question 2
1 / -0

Which of the following compounds will dissolve end other mically in water?

A
LiI

B
LiBr

C
LiF

D
LiCl

Solution

Lattice energy of LiF > hydration energy of Li⁺ and F^– ions. However, the salt dissolves due to entropy factor (increase in randomness).
Question 3
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The basic character of MgO, BaO, Na₂O and FeO follow the order

A
FeO < MgO < BaO < Na₂O

B
MgO < FeO < BaO < Na₂O

C
Na₂O<MgO<FeO<BaO

D
FeO < MgO < Na₂O < BaO

Solution

The basic character of metal oxides decreases from left to right in a period and increases down the group.
Question 4
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The correct order of increasing lattice energy of the following is

A
NaF<NaCI<KBr<LiF

B
LiF < NaF < NaCI < KBr

C
NaCI <NaF< KBr < LiF

D
KBr < NaCI < NaF < LiF

Solution

Larger are the ionic radii, smaller is the value of lattice energy. Ionic radii vary in the order: K⁺> Na⁺> Li⁺;Br^- > Cl^->F^-
Question 5
1 / -0

The most stable oxidation states of thallium and bismuth are respectively

A
+1, +5

B
+3, +3

C
+1, +1

D
+1, +3

Solution

Thallium and bismuth show inert pair effect.
Question 6
1 / -0

The melting points of the following halides follow the order

A
LiCl < RbCl <KCl <NaCI

B
RbCl<KCl <NaCI<LiCI

C
LiCl <NaCl < KCl <RbCI

D
LiCl <KCl < RbCl <NaCI

Solution

The covalent character of the ionic bond increases with the decrease in the size of the cation (Fajan’s rule).
Question 7
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Which of the following can be predicted from electronegativity values of elements?

A
Position in electrochemical series

B
Valency of elements

C
Polarity of bonds

D
Dipole moment of a molecule

Solution

Greater the difference of electronegativities, more polar is the bond.
Question 8
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Amongst the following statements which is /are correct?

A
The second ionization potential of boron is greater than that of carbon

B
First I.P. of Al and Ga are almost the same.

C
The second I.P of Mg is greater than that of P.

D
First ionization potential of S is greater than that of P.

Solution

Removal of an electron from B⁺(1s²2s²)requires greater energy than from C⁺(1s² 2s² 2p¹) .

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Re-Attempt Weekly Quiz Competition

Classification of elements & Periodicity in properties Test - 1

Result

Classification of elements & Periodicity in properties Test - 1

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SHARING IS CARING

Question 1

Cu < V < Mn < Cr

V < Cr < Mn < Cu

Cu < V < Cr < Mn

Cu < Mn < Cr < V

Solution

Question 2

LiI

LiBr

LiF

LiCl

Solution

Question 3

FeO < MgO < BaO < Na2O

MgO < FeO < BaO < Na2O

Na2O<MgO<FeO<BaO

FeO < MgO < Na2O < BaO

Solution

Question 4

NaF<NaCI<KBr<LiF

LiF < NaF < NaCI < KBr

NaCI <NaF< KBr < LiF

KBr < NaCI < NaF < LiF

Solution

Question 5

+1, +5

+3, +3

+1, +1

+1, +3

Solution

Question 6

LiCl < RbCl <KCl <NaCI

RbCl<KCl <NaCI<LiCI

LiCl <NaCl < KCl <RbCI

LiCl <KCl < RbCl <NaCI

Solution

Question 7

Position in electrochemical series

Valency of elements

Polarity of bonds

Dipole moment of a molecule

Solution

Question 8

The second ionization potential of boron is greater than that of carbon

First I.P. of Al and Ga are almost the same.

The second I.P of Mg is greater than that of P.

First ionization potential of S is greater than that of P.

Solution

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FeO < MgO < BaO < Na₂O

MgO < FeO < BaO < Na₂O

Na₂O<MgO<FeO<BaO

FeO < MgO < Na₂O < BaO