Chemistry Test 90

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Chemistry Test 90

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Weekly Quiz Competition

Question 1
4 / -1

On adding AgNO₃ solution into KI solution, a negatively charged AgI colloidal sol is obtained when they are in :-

A
50 mL of 0.1 M AgNO₃ + 50 mL of 0.1 M KI

B
50 mL of 0.1 M AgNO₃ + 50 mL of 0.2 M KI

C
50 mL of 0.2 M AgNO₃ + 50 mL of 0.1 M KI

D
None of these

Solution

AgNO₃ + KI → AgI + KNO₃

Sol

∵ for – ve sol AgI will adsorb I^– from KI so mol of KI > AgNO₃
Question 2
4 / -1

Arrange the following electrolytes in the increasing order of coagulation power for the coagulation of As₂S₃ sol :

NaCl CaCl₂ SnCl₄ AlCl₃

(I) (II) (III) (IV)

A
I < II < III < IV

B
I = III < II < IV

C
III < IV < I < II

D
I < II < IV < III
Question 3
4 / -1

100 mL of 0.6 M acetic acid is shaken with 2 g activated carbon. The final concentration of the solution after adsorption is 0.5 M. What is the amount of acetic acid adsorbed per gram of carbon :-

A
0.6 g

B
0.3 g

C
1.2 g

D
None of these

Solution

Mass of acetic acid adsorbed by 2 g charcol

= 100 × 10^–3 × (0.6 – 0.5) × 60

⇒ 0.6; x/m = 0.6/2 ⇒ 0.3
Question 4
4 / -1

Gold number of a lyophilic sol is such a property that :

A
The larger its value, the greater is the peptizing power

B
The lower its value, the greater is the peptizing power

C
The lower its value, the greater is the protecting power

D
The larger its value, the greater is the protecting power
Question 5
4 / -1

In the form of dichromate, Cr⁺⁶ is a strong oxidising agent in acidic medium, but Mo⁺⁶ in MoO₃ and W⁺⁶ in WO₃ are not because:

A
Cr⁺⁶ is more stable than Mo⁺⁶ and W⁺⁶

B
Mo⁺⁶ and W⁺⁶ are less stable than Cr⁺⁶

C
Higher oxidation state of heavier members of group 6 of transition metals are more stable

D
Lower oxidation state of heavier members of group 6 of transition metals are more stable

Solution

'+6' oxidation state of Mo and W is more stable as compared to Cr.
Question 6
4 / -1

Which compound exists?

A
MnO₃F

B
K₂[CuI₄]

C
MnF₇

D
CrF₇

Solution

With I^–, +1 oxidation state of Cu is more stable hence, K₂[CuI₄] does not exist. MnF₄ and CrF₆ exist but not MnF₇ and CrF₇.
Question 7
4 / -1

The part of the skin that comes in contact with nitric acid turns yellow because:

A
Proteins are converted into xanthoproteins

B
Water is removed by the acid

C
Skin gets burnt

D
Nitrocellulose is formed

Solution

Proteins of skin are converted into xanthoproteins when skin comes into the contact of HNO₃.
Question 8
4 / -1

Gaseous products formed when Zn reacts with dil. H₂SO₄ and conc. H₂SO₄ respectively:

A
H₂S, SO₂

B
H₂, SO₂

C
SO₂, H₂

D
SO₃, H₂S

Solution

Zn + dil. H₂SO₄ → ZnSO₄ + H₂↑

Zn + conc. H₂SO₄ → ZnSO₄ + SO₂↑+ H₂O
Question 9
4 / -1

Which of the following order is not correct?

A
F^– < Cl^– < Br^– < I^– (Reducing nature)

B
F^– > Cl^– > Br^– > I^– (Hydration enthalpy)

C
Cl₂ > F₂ > Br₂ > I₂ (Bond dissociation energy)

D
F₂ > Cl₂ > Br₂ > I₂ (Reactivity)

Solution

Correct order of bond dissociation energy is, Cl₂ > Br₂ > F₂ > I₂
Question 10
4 / -1

Which of the following can not be obtained by hydrolysis of XeF₆ ?

A
XeO₃

B
HF

C
XeO₂F₂

D
Xe

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Chemistry Test 90

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Chemistry Test 90

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Question 1

50 mL of 0.1 M AgNO3 + 50 mL of 0.1 M KI

50 mL of 0.1 M AgNO3 + 50 mL of 0.2 M KI

50 mL of 0.2 M AgNO3 + 50 mL of 0.1 M KI

None of these

Solution

Question 2

I < II < III < IV

I = III < II < IV

III < IV < I < II

I < II < IV < III

Question 3

0.6 g

0.3 g

1.2 g

None of these

Solution

Question 4

The larger its value, the greater is the peptizing power

The lower its value, the greater is the peptizing power

The lower its value, the greater is the protecting power

The larger its value, the greater is the protecting power

Question 5

Cr+6 is more stable than Mo+6 and W+6

Mo+6 and W+6 are less stable than Cr+6

Higher oxidation state of heavier members of group 6 of transition metals are more stable

Lower oxidation state of heavier members of group 6 of transition metals are more stable

Solution

Question 6

MnO3F

K2[CuI4]

MnF7

CrF7

Solution

Question 7

Proteins are converted into xanthoproteins

Water is removed by the acid

Skin gets burnt

Nitrocellulose is formed

Solution

Question 8

H2S, SO2

H2, SO2

SO2, H2

SO3, H2S

Solution

Question 9

F– < Cl– < Br– < I– (Reducing nature)

F– > Cl– > Br– > I– (Hydration enthalpy)

Cl2 > F2 > Br2 > I2 (Bond dissociation energy)

F2 > Cl2 > Br2 > I2 (Reactivity)

Solution

Question 10

XeO3

HF

XeO2F2

Xe

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50 mL of 0.1 M AgNO₃ + 50 mL of 0.1 M KI

50 mL of 0.1 M AgNO₃ + 50 mL of 0.2 M KI

50 mL of 0.2 M AgNO₃ + 50 mL of 0.1 M KI

Cr⁺⁶ is more stable than Mo⁺⁶ and W⁺⁶

Mo⁺⁶ and W⁺⁶ are less stable than Cr⁺⁶

MnO₃F

K₂[CuI₄]

MnF₇

CrF₇

H₂S, SO₂

H₂, SO₂

SO₂, H₂

SO₃, H₂S

F^– < Cl^– < Br^– < I^– (Reducing nature)

F^– > Cl^– > Br^– > I^– (Hydration enthalpy)

Cl₂ > F₂ > Br₂ > I₂ (Bond dissociation energy)

F₂ > Cl₂ > Br₂ > I₂ (Reactivity)

XeO₃

XeO₂F₂