Chemistry Test 13

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Chemistry Test 13

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Weekly Quiz Competition

Question 1
4 / -1

In terms of polar character, which of the following order is correct ?

A
NH₃ < H₂O < HF < H₂S

B
H₂S < NH₃ < H₂O < HF

C
H₂O < NH₃ < H₂S < HF

D
HF < H₂O < NH₃ < H₂S

Solution

Polar character ∝ ΔE. N
Question 2
4 / -1

Ionisation potential values of d-block elements as compared to ionization potential value of f-block elements are

A
Higher

B
Equal

C
Lower

D
All of these

Solution

Due to poor shielding of f-orbitals, removal of electron is easier in f-block elements, so they have lesser ionisation energies than d-block elements.
Question 3
4 / -1

Heating mixture of Cu₂O and Cu₂S will give

A
Cu + SO₂

B
Cu + SO₃

C
CuO + CuS

D
Cu₂SO₃

Solution

2Cu₂O + Cu₂S → 6Cu + SO₂
Hence, option A is correct.
Question 4
4 / -1

Which of the following relation is incorrect for water at 25 ºC.

A
α = 1.8 × 10^–9

B
K_a = K_b = 1.8 × 10^–16

C
pK_a = pK_b = 15.74

D
K_a = K_b = 10^–14

Solution

At 25^oC, the degree of dissociation for water is 1.8× 10^–7. Hence option A is incorrect.
Question 5
4 / -1

Choose the incorrect statement -

A
Higher the value of K_a stronger is the acid

B
Smaller the value of pK_a stronger is the acid

C
Higher the value of K_b stronger is the base

D
Higher the value of pK_b stronger is the base

Solution

The value of K_b decides the strong non of Basr. Higher the K_b, stronger the base P_kb may higher the K_b, towr the P_kb .
Question 6
4 / -1

Which part of the soap (RCOO^–) dissolves grease and forms micelles ?

A
R part (called tail of the anion)

B
COO^– part (called head of the anion)

C
Both (a) and (b)

D
None of the above

Solution

The organic part of a soap is a negatively-charged, polar molecule. The carboxylate group present in it, is hydrophilic in nature. The long hydrocarbon chain is a hydrophobic part of a soap molecule. It does not interact with water, so it forms cluster called micelles. It is the part that dissolves oil and grease present in the clothes.
Question 7
4 / -1

As per Charles law which of the following is/are correct -

A
Pressure remain definite

B
Mass remain definite

C
volume is proportional to the absolute temperature

D
All of the above are correct

Solution

V /T = constant (P & mass constant)

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Chemistry Test 13

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Chemistry Test 13

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Question 1

NH3 < H2O < HF < H2S

H2S < NH3 < H2O < HF

H2O < NH3 < H2S < HF

HF < H2O < NH3 < H2S

Solution

Question 2

Higher

Equal

Lower

All of these

Solution

Question 3

Cu + SO2

Cu + SO3

CuO + CuS

Cu2SO3

Solution

Question 4

α = 1.8 × 10–9

Ka = Kb = 1.8 × 10–16

pKa = pKb = 15.74

Ka = Kb = 10–14

Solution

Question 5

Higher the value of Ka stronger is the acid

Smaller the value of pKa stronger is the acid

Higher the value of Kb stronger is the base

Higher the value of pKb stronger is the base

Solution

Question 6

R part (called tail of the anion)

COO– part (called head of the anion)

Both (a) and (b)

None of the above

Solution

Question 7

Pressure remain definite

Mass remain definite

volume is proportional to the absolute temperature

All of the above are correct

Solution

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NH₃ < H₂O < HF < H₂S

H₂S < NH₃ < H₂O < HF

H₂O < NH₃ < H₂S < HF

HF < H₂O < NH₃ < H₂S

Cu + SO₂

Cu + SO₃

Cu₂SO₃

α = 1.8 × 10^–9

K_a = K_b = 1.8 × 10^–16

pK_a = pK_b = 15.74

K_a = K_b = 10^–14

Higher the value of K_a stronger is the acid

Smaller the value of pK_a stronger is the acid

Higher the value of K_b stronger is the base

Higher the value of pK_b stronger is the base

COO^– part (called head of the anion)