S- And p-Block Elements Test

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S- And p-Block Elements Test - 5

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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 - p 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.

E
None of these

Solution

Thermal stability of hydrides decreases as we go down the group.
Hence, this option is correct.
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.

E
None of these

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^-

E
None of these

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

E
none of these

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

E
None of these

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

E
None of these

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

E
None of these

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

E
none of these

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

After reaction with potassium iodide and copper sulphate, sodium thiosulphate solution is added. Find the incorrect statement about this reaction.

A
Cu₂I₂ is formed.

B
CuI₂ is formed.

C
Na₂S₂O₃ is oxidised.

D
Evolved I₂ is reduced.

E
None of these

Solution

When KI is added to the solution of cupper sulphate, an equivalent amount of I₂ is liberated along with the formation white precipitate (of Cu₂I₂). This free iodine (I₂), which remains in solution as [KI₃] complex is then titrated with sodium thiosulphate solution using starch as indicator. At the end point of the titration, the blue colour of solution will disappear and a white precipitate of the Cu₂I₂ will remain in conical.
The reactions that are taking place are:
Question 10
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.

E
None of these

Solution

Mud is colloidal charged solution which on treatment with Alum (Al³⁺) gets neutralised or coagulated.
Question 11
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

E
None of these

Solution

Ammonium ion (NH_⁴)⁺ is acidic in nature.
Question 12
1 / -0

Identify the amphoteric compound.

A
SnO₂

B
SiO₂

C
CO₂

D
CaO

E
None of these

Solution

SnO₂ in base forms SnCl₄ and in acid forms SnO₃^2-.
Question 13
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.

E
None of these

Solution

Polarity along O-H in HNO₃is more in comparision to that in HNO₂.
Question 14
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

E
None of these

Solution

True statement. Out of 3 , only one H atom is ionisable. Rest 2 are permanently attached to P atom.
Question 15
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

E
none of these

Solution

Two moles of ammonia gas are released.

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S- And p-Block Elements Test - 5

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S- And p-Block Elements Test - 5

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Question 1

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

d - p bond is not formed by nitrogen.

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

Two resonance structure is formed by N2O4.

None of these

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.

None of these

Solution

Question 3

BF63-

BH4-

B(OH)4-

BO2-

None of these

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

none of these

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

None of these

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

None of these

Solution

Question 7

Exhibiting maximum covalency in compounds

Forming polymeric hydrides

Forming covalent hydrides

Exhibiting amphoteric nature in their oxides

None of these

Solution

Question 8

a microcrystalline solid

supercooled liquid

gel

polymeric mixture

none of these

Solution

Question 9

Cu2I2 is formed.

CuI2 is formed.

Na2S2O3 is oxidised.

Evolved I2 is reduced.

None of these

Solution

Question 10

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.

None of these

Solution

Question 11

Potassium nitrate

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^-

Cu₂I₂ is formed.

CuI₂ is formed.

Na₂S₂O₃ is oxidised.

Evolved I₂ is reduced.

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.