p-Block Elements Test

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p-Block Elements Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following species is not a pseudohalide?

A
N₃^–

B
CN^–

C
OCN^–

D
IF₈^–
Question 2
1 / -0

A gas X with disagreeable odour reduces silver nitrate solution to give metallic silver and is itself oxidised to Y. Y is a dibasic acid with reducing properties. It is slowly oxidised in air to a tribasic acid Z. Though Z is a tribasic acid, it behaves in aqueous solution mostly as a dibasic acid. When a mixture of X and N₂O is subjected to electric spark, Z is obtained.

The gas X is

A
ammonia

B
phosphine

C
hydrogen sulphide

D
sulphur dioxide
Question 3
1 / -0

The following question has four choices, out of which ONLY ONE is correct.

Which of the following statements about SCl₄ is not correct?

A
It is a stable solid.

B
It has a trigonal bipyramidal structure with one of the equatorial positions occupied by a lone pair of electrons.

C
S-Cl bond distances in equatorial and axial positions are 155 pm and 165 pm, respectively.

D
Cl-S-Cl bond angles in equatorial and axial planes are 102⁰ and 172⁰,respectively.
Question 4
1 / -0

The stability of dihalides of Si, Ge, Sn and Pb increases steadily in the sequence

A
SiX₂ < GeX₂ < SnX₂ < PbX₂

B
PbX₂ < SnX₂ < GeX₂ < SiX₂

C
GeX₂ < SiX₂ < SnX₂ < PbX₂

D
SiX₂ < GeX₂ < PbX₂ < SnX₂
Question 5
1 / -0

Which of the following is the strongest acid?q

A
HClO₄

B
HNO₃

C
HClO

D
H₂SO₄
Question 6
1 / -0

Fluoride ions are added to toothpaste to

A
maintain brightness of teeth

B
harden enamel of teeth

C
improve digestion

D
remove bacteria from mouth
Question 7
1 / -0

The hybridisation and the geometry of ICl₃ in liquid phase are ____ and _____, respectively.

A
sp³, bent

B
sp³d, square planar

C
sp³d², see–saw

D
sp³d, T–shaped
Question 8
1 / -0

The following question has four choices, out of which ONLY ONE is correct.

Xe and F2 heated in molar ratio 1 : 20 at 400⁰C give a compound X. X reacts slowly with atmospheric moisture to give Y and HF. When X reacts with small quantity of water, we get a product Z. Z can also be obtained by the interaction of X with silica. Y reacts with X to give Z. But Y and Z react to give XeO₂F₂.

Y is

A
Xe

B
XeO₃

C
XeOF₄

D
XeO₂F₂
Question 9
1 / -0

Which among the following forms basic oxide?

A
Antimony

B
Nitrogen

C
Bismuth

D
Phosphorous

Solution

As we move down the group in periodic table , metallic character increases so Bi is a metal thus its oxide is basic.
Question 10
1 / -0

The oxidation state of nitrogen in dinitrogen oxide is

A
+ 1

B
+ 2

C
+ 3

D
+ 4
Question 11
1 / -0

Which of the following statements is incorrect regarding hypophosphorous acid?

A
It is a dibasic acid.

B
It contains P in +1 oxidation state.

C
It is a strong reducing agent.

D
It is obtained during the preparation of phosphine from white phosphorus.
Question 12
1 / -0

The following question has four choices, out of which ONLY ONE is correct.

P₄O₈ reacts with sufficient water to produce

A
four moles of phosphoric acid + O₂ gas

B
four moles of phosphorous acid + O₂ gas

C
phosphoric acid + phosphorous acid

D
three moles of phosphorous acid + one mole of PH₃ gas
Question 13
1 / -0

The following question has four choices, out of which ONLY ONE is correct.

Which of the following statements about white phosphorus is true?

A
It has six P-P single bonds.

B
It has three P-P sigma bonds.

C
It has two lone pairs of electrons.

D
The P-P-P angle in it is 109^o27^`.
Question 14
1 / -0

The following question has four choices, out of which ONLY ONE is correct.

An inorganic salt (a) is decomposed at about 523 K to give products (b) and (c). Compound (c) is liquid at room temperature and is neutral to litmus paper, while oxide (b) on burning with white phosphorus gives a dehydrating agent (d). Compounds (a), (b), (c) and (d) will be identified respectively as:

A
NH₄NO₃, N₂O, H₂O, P₄O₁₀

B
NH₄NO₂, N₂O, H₂O, P₄O₁₀

C
CaCO₃, CaO, H₂O, CaCl₂

D
CaCO₃, CaO, H₂O, Ca(OH)₂
Question 15
1 / -0

The number of lone pairs of electrons in XeO₄ is

A
0

B
1

C
2

D
3

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p-Block Elements Test - 2

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p-Block Elements Test - 2

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Question 1

N3–

CN–

OCN–

IF8–

Question 2

ammonia

phosphine

hydrogen sulphide

sulphur dioxide

Question 3

It is a stable solid.

It has a trigonal bipyramidal structure with one of the equatorial positions occupied by a lone pair of electrons.

S-Cl bond distances in equatorial and axial positions are 155 pm and 165 pm, respectively.

Cl-S-Cl bond angles in equatorial and axial planes are 1020 and 1720, respectively.

Question 4

SiX2 < GeX2 < SnX2 < PbX2

PbX2 < SnX2 < GeX2 < SiX2

GeX2 < SiX2 < SnX2 < PbX2

SiX2 < GeX2 < PbX2 < SnX2

Question 5

HClO4

HNO3

HClO

H2SO4

Question 6

maintain brightness of teeth

harden enamel of teeth

improve digestion

remove bacteria from mouth

Question 7

sp3, bent

sp3d, square planar

sp3d2, see–saw

sp3d, T–shaped

Question 8

Xe

XeO3

XeOF4

XeO2F2

Question 9

Antimony

Nitrogen

Bismuth

Phosphorous

Solution

Question 10

+ 1

+ 2

+ 3

+ 4

Question 11

It is a dibasic acid.

It contains P in +1 oxidation state.

It is a strong reducing agent.

It is obtained during the preparation of phosphine from white phosphorus.

Question 12

four moles of phosphoric acid + O2 gas

four moles of phosphorous acid + O2 gas

phosphoric acid + phosphorous acid

three moles of phosphorous acid + one mole of PH3 gas

Question 13

It has six P-P single bonds.

It has three P-P sigma bonds.

It has two lone pairs of electrons.

The P-P-P angle in it is 109o27`.

Question 14

NH4NO3, N2O, H2O, P4O10

NH4NO2, N2O, H2O, P4O10

CaCO3, CaO, H2O, CaCl2

CaCO3, CaO, H2O, Ca(OH)2

Question 15

N₃^–

CN^–

OCN^–

IF₈^–

Cl-S-Cl bond angles in equatorial and axial planes are 102⁰ and 172⁰,respectively.

SiX₂ < GeX₂ < SnX₂ < PbX₂

PbX₂ < SnX₂ < GeX₂ < SiX₂

GeX₂ < SiX₂ < SnX₂ < PbX₂

SiX₂ < GeX₂ < PbX₂ < SnX₂

HClO₄

HNO₃

H₂SO₄

sp³, bent

sp³d, square planar

sp³d², see–saw

sp³d, T–shaped

XeO₃

XeOF₄

XeO₂F₂

four moles of phosphoric acid + O₂ gas

four moles of phosphorous acid + O₂ gas

three moles of phosphorous acid + one mole of PH₃ gas

The P-P-P angle in it is 109^o27^`.

NH₄NO₃, N₂O, H₂O, P₄O₁₀

NH₄NO₂, N₂O, H₂O, P₄O₁₀

CaCO₃, CaO, H₂O, CaCl₂

CaCO₃, CaO, H₂O, Ca(OH)₂