S- And p-Block Elements Test

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S- And p-Block Elements Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

Identify the wrong statement.

A
In group-15 of the periodic table, stability of hydrides increases from nitrogen hydride to bismuth hydride.

B
d π - p π bond is not formed by nitrogen.

C
Single P-P bond is stronger than single N-N bond.

D
Two resonance structure is formed by N₂O₄.

Solution

Thermal stability of hydrides decreases as we go down the group.
Question 2
1 / -0

Which of the following information about sulphur is incorrect?

A
Sulphur molecule is not diamagnetic.

B
The vapour at 200^oC consists mostly of S₈rings.

C
At 600^oC, the gas mainly consists of S₂ molecules.

D
The oxidation state of sulphur is never less than +4 in its compounds.

Solution

Oxidation states of sulphur are - 2, 0, + 2, + 4, + 6.
Valency can be less than 4.

Incorrect statement
Question 3
1 / -0

Which of the following anions of boron is not possible?

A
BF₆^3-

B
BH₄^-

C
B(OH)₄^-

D
BO₂^-

Solution

Due to absence of 2d-orbitals, the maximum covalency is four.
Question 4
1 / -0

Lithium nitrate on heating forms

A
lithium nitrite and oxygen gas

B
lithium oxide, nitrogen dioxide and oxygen gas

C
lithium nitride and oxygen gas

D
lithium oxide, hydroxide and oxygen gas

Solution

Correct statement. It forms lithium oxide, nitrogen dioxide and oxygen gas.
Question 5
1 / -0

When small amount of sodium oxide is dissolved in water, then

A
oxidation number of sodium decreases

B
oxide ion accepts shared pair of electrons

C
oxide ion donates a pair of electrons

D
oxidation number of oxygen increases

Solution

Oxide ion donates a pair of electrons, and thus changes to hydroxide ion.
Question 6
1 / -0

In which of the following is hard water produced?

A
Saturation of water with calcium carbonate

B
Saturation of water with magnesium carbonate

C
Saturation of water with calcium sulphate

D
Addition of sodium sulphate to water

Solution

Ca and Mg soluble sulphates and chlorides cause permanent hardness.
Question 7
1 / -0

Which property differs Be and Al from each other?

A
Exhibiting maximum covalency in compounds

B
Forming polymeric hydrides

C
Forming covalent hydrides

D
Exhibiting amphoteric nature in their oxides

Solution

Be, Z = 4 has maximum covalency of 4 while Al, Z = 13 has maximum covalency of 6.
Question 8
1 / -0

Glass is categorised as

A
a microcrystalline solid

B
supercooled liquid

C
gel

D
polymeric mixture

Solution

Glass is a supercooled liquid, which forms a non-crystalline solid. The common lime-soda glass used for bottles and jars is a super cooled mixture of sodium and calcium silicates.
Question 9
1 / -0

What is the reason for using alum for purifying the water?

A
It forms complex with clay particles.

B
It coagulates the mud particles.

C
It exchanges Ca²⁺ and Mg²⁺ ions present in hard water.

D
Its sulphate ion is a water purifier.

Solution

Mud is colloidal charged solution which on treatment with Alum (Al³⁺) gets neutralised or coagulated.
Question 10
1 / -0

Which of the following fertilisers is used to increase the acidity of soil?

A
Potassium nitrate

B
Urea

C
Superphosphate of lime

D
Ammonium sulphate

Solution

Ammonium ion (NH_⁴)⁺ is acidic in nature.
Question 11
1 / -0

Identify the amphoteric compound.

A
SnO₂

B
SiO₂

C
CO₂

D
CaO

Solution

SnO₂ in base forms SnCl₄ and in acid forms SnO₃^2-.
Question 12
1 / -0

Identify the correct statement.

A
H₃PO₄ is a stronger acid than H₂SO₄.

B
HF is a stronger acid than HCl in an aqueous medium.

C
HClO₄is a weaker acid than HClO₃.

D
HNO₃ is a stronger acid than HNO₂.

Solution

Polarity along O-H in HNO₃is more in comparision to that in HNO₂.
Question 13
1 / -0

In hypophosphorous acid, number of hydrogen atom(s) attached to phosphorus atom after ionisation in water is

A
0

B
1

C
2

D
3

Solution

True statement. Out of 3 , only one H atom is ionisable. Rest 2 are permanently attached to P atom.
Question 14
1 / -0

When 1 mole of Mg₃N₂ is dissolved in water, it releases

A
one mole ammonia

B
one mole nitric acid

C
two moles of ammonia

D
two moles of nitric acid

Solution

Two moles of ammonia gas are released.

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S- And p-Block Elements Test - 3

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S- And p-Block Elements Test - 3

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Question 1

In group-15 of the periodic table, stability of hydrides increases from nitrogen hydride to bismuth hydride.

d π - p π bond is not formed by nitrogen.

Single P-P bond is stronger than single N-N bond.

Two resonance structure is formed by N2O4.

Solution

Question 2

Sulphur molecule is not diamagnetic.

The vapour at 200oC consists mostly of S8 rings.

At 600oC, the gas mainly consists of S2 molecules.

The oxidation state of sulphur is never less than +4 in its compounds.

Solution

Question 3

BF63-

BH4-

B(OH)4-

BO2-

Solution

Question 4

lithium nitrite and oxygen gas

lithium oxide, nitrogen dioxide and oxygen gas

lithium nitride and oxygen gas

lithium oxide, hydroxide and oxygen gas

Solution

Question 5

oxidation number of sodium decreases

oxide ion accepts shared pair of electrons

oxide ion donates a pair of electrons

oxidation number of oxygen increases

Solution

Question 6

Saturation of water with calcium carbonate

Saturation of water with magnesium carbonate

Saturation of water with calcium sulphate

Addition of sodium sulphate to water

Solution

Question 7

Exhibiting maximum covalency in compounds

Forming polymeric hydrides

Forming covalent hydrides

Exhibiting amphoteric nature in their oxides

Solution

Question 8

a microcrystalline solid

supercooled liquid

gel

polymeric mixture

Solution

Question 9

It forms complex with clay particles.

It coagulates the mud particles.

It exchanges Ca2+ and Mg2+ ions present in hard water.

Its sulphate ion is a water purifier.

Solution

Question 10

Potassium nitrate

Urea

Superphosphate of lime

Ammonium sulphate

Solution

Question 11

SnO2

SiO2

CO2

CaO

Solution

Question 12

H3PO4 is a stronger acid than H2SO4.

HF is a stronger acid than HCl in an aqueous medium.

HClO4 is a weaker acid than HClO3.

HNO3 is a stronger acid than HNO2.

Solution

Two resonance structure is formed by N₂O₄.

The vapour at 200^oC consists mostly of S₈rings.

At 600^oC, the gas mainly consists of S₂ molecules.

BF₆^3-

BH₄^-

B(OH)₄^-

BO₂^-

It exchanges Ca²⁺ and Mg²⁺ ions present in hard water.

SnO₂

SiO₂

CO₂

H₃PO₄ is a stronger acid than H₂SO₄.

HClO₄is a weaker acid than HClO₃.

HNO₃ is a stronger acid than HNO₂.