p-Block Elements Test

Result

p-Block Elements Test - 27

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Weekly Quiz Competition

Question 1
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Direction (Q. Nos. 1-10) This section contains 10 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.
Q.
Which of the following property decreases down the group in the halogens?

A
Electropositive nature

B
Density

C
Boiling point

D
Ionisation enthalp

Solution

Due to increase in atomic size, ionisation enthalpy decreases down the group.
Question 2
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Which of the following represents the decreasing order of van der Waals’ forces in halogens ?

A
F₂ > Cl₂ > Br₂ > I₂

B
I₂ > Br₂ > Cl₂ > F₂

C
Br₂ > Cl₂ > F₂ > I₂

D
Cl₂ > F₂ > I₂ > Br₂

Solution

Melting point increases with halogens from fluorine to iodine because van der Waals’ forces are stronger down the groups.
Question 3
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The correct order of in creasing order of radiiions Br^-, F^-, O^2- and S^2- is as follow

A
Br^-,< F^-,2- 2-

B
S^2-2- < F^--

C
F^-2-2--

D
F^-- 2-2-

Solution

Atomic and ionic radii increase down the group due to increasing number of quantum shells.
Question 4
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The correct order for the percentage of ionic character is

A
HI > HBr > HCI > HF

B
HI < HBr < HCI < HF

C
HI = HBr < HCI < HF

D
HI< HBr < HCI = HF

Solution

As the electronegativity of halogen decreases, the dipole moment of the hydrogen halide and hence, the ionic character decreases in the same order, i.e. HI < HBr < HCI < HF.
Question 5
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Which of the following statement is incorrect ?

A
SRP values of halogens F₂ > Cl₂ > Br₂ > I₂

B
Bond dissociation enthalpy of Br₂ > F₂ > Cl₂> I₂

C
Boiling points of I₂ > Br₂ > Cl₂ > F₂

D
Reducing power of I^- > Br^- > Cl^- > F^-

Solution

The correct order of bond dissociation enthalpy is
Question 6
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Which option is incorrect among the following for the given property?

A
Dipole moment (HF > HCI > HBr > HI)

B
Bond length (HI > HBr > HCI > HF)

C
Acidic strength (HI > HBr > HCI > HF)

D
Thermal stability (HF < HCI < HBr < HI)

Solution

Thermal stability decreases as the strength of H-X bond decreases which in turn decreases as the size of the halogen increases, i.e. HF > HCI > HBr > HI
Question 7
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When Cl₂ gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine changes from

A
zero to +1 and zero to -5

B
zero to -1 and zero to +5

C
zero to 1 and zero to +5

D
zero to +1 and zero to -3

Solution

When chlorine gas reacts with hot and concentrate NaOH solution, it disproportionates into Chloride (Cl^-) and Chlorate (ClO₃^-) ions.
Question 8
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Which of the following does not exist?

A

B

C

D

Solution

Fluorine has no d-orbitals in the valence shell. Hence, it always show - 1 oxidation state and monovalency in its compounds.
Question 9
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One gas bleaches the colour of flowers by reduction and another gas by oxidation. The gases respectively are

A
SO₂ and CI₂

B
CO₂ and CI₂

C
NO and CI₂

D
H₂S and Br₂

Solution

Cl₂ bleaches by oxidation while SO₂ does it by reduction.
Question 10
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Solid iodine is an example of

A
covalent solid

B
ionic solid

C
molecular solid

D
metallic solid

Solution

Solid iodine is a molecular solid.
Question 11
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Direction (Q. No. 11 and 12) Choices for the correct combination of elements from Column I and Column II are given as options (a), (b), (c) and (d), out of which one is correct.
Q.
Match the Column I with Column II and mark the correct option from the codes given below.

A

B

C

D

Solution
Question 12
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Match the Column I with Column II and mark the correct option from the codes given below.

A

B

C

D

Solution