Chemistry Test 119

Result

Chemistry Test 119

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Question 1/8
4 / -1

Which of the following set of all quantum number is correct for the last e^– that enters in Fe.

Correct

Wrong

Skipped
A
n = 4, ℓ = 0, m = 0, s = +

Correct

Wrong

Skipped
B
n = 3, ℓ = 1, m = 0, s = -

Correct

Wrong

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C
n = 3, ℓ = 2, m = –1, s = +

Correct

Wrong

Skipped
D
n = 4, ℓ = 1, m = 0, s = -

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Solutions
Question 2/8
4 / -1

Find the incorrect acidic strength order

Correct

Wrong

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A
K₂O > Rb₂O > Cs₂O

Correct

Wrong

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B
N₂O₅ < NO₂ < N₂O₃

Correct

Wrong

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C
Li₂O < BeO < N₂O₅

Correct

Wrong

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D
Cl₂O₇ > P₂O₅ > SiO₂
Question 3/8
4 / -1

Which of the following is INCORRECT statement ?

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A
In adiabatic expansion of an ideal gas, temperature of system always decrease

Correct

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B
In isothermal expansion of an ideal gas, temperature of a gas always remains constant

Correct

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C
In a reversible adiabatic compression of an ideal gas, change in entropy of system is zero

Correct

Wrong

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D
In an irreversible adiabatic compression of an ideal gas, change in entropy of system is positive

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Solutions

In adiabatic free expansion temperature does not change.
Question 4/8
4 / -1

Calculate the magnitude of net work done in the following cycle for one mol of an ideal gas in Calorie. Where in process BC, PT = constant. (R = 2cal/mol-K)

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A
800 cal

Correct

Wrong

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B
200 cal

Correct

Wrong

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C
300 cal

Correct

Wrong

Skipped
D
400 cal

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Solutions

w_total=w_AB + w_BC + w_CA

w_AB = 0 (isochoric)

w_CA = –nRΔT (isobaric)

= –1 × 2 × –800 = 1600 Cal

w_total=0 – 2400 + 1600 = –800 Cal
Question 5/8
4 / -1

Which of the following statements is/are correct ?

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A
Ca²⁺ has a smaller ionic radius than K⁺

Correct

Wrong

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B
2p^- orbital is lower in energy than 2s of Be atom

Correct

Wrong

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C
F is more electronegative than Cl atom

Correct

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D
option 1 and option 3 are correct
Question 6/8
4 / -1

Which of the following set of quantum number is/are not possible for Ac?

Correct

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A
n = 3, l = 3, m = 0, s = +

Correct

Wrong

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B
n = 6, l = 2, m = –1, s = -

Correct

Wrong

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C
n = 6, l = 3, m = –2, s = +

Correct

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D
option 1 and option 3 are correct
Question 7/8
4 / -1

For the change -

R → P ; ΔH = –ve

If above reaction increase the disorderness of system then -

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A
ΔH_f(P) > ΔH_f (R)

Correct

Wrong

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B
ΔHC(P) > ΔHC (R)

Correct

Wrong

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C
ΔS_f(P) > ΔS_f (R)

Correct

Wrong

Skipped
D
option 2 and option 4 are correct

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Solutions

R → P ΔH = –ve, ΔS = +ve

(A) ΔH = Δ_fH_(P) – Δ_fH_(R) < 0
Δ_fH_(P) < Δ_fH_(R)

(B) ΔH = Δ_CH_(R) – Δ_CH_(P) < 0
Δ_CH_(P) > Δ_CH_(R)

(D) ΔS = +ve
Δ_fS_(P) – Δ_fS_(R) > 0
Δ_fS_(P) > Δ_fS_(R)
So, B, D
Question 8/8
4 / -1

Consider the following reaction :

2Fe₂O₃(s) + 3C(s) → 4Fe(s) + 3CO₂(g)

ΔH_f^º of Fe₂O₃ & CO₂ are –820 kJ/mol and –390 kJ/mol respectively.

The reaction is -

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A
Endothermic

Correct

Wrong

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B
Exothermic

Correct

Wrong

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C
Spontaneous at high temperature

Correct

Wrong

Skipped
D
option 1 and option 3 are correct

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Solutions

ΔH = 3 × (–390) – 2 (–820)

= 470 kJ/mol

ΔG < 0 ΔH – T ΔS < 0

for spontaneous reaction → T ΔS > ΔH

(∵ ΔS > 0)

Question 1/8

n = 4, ℓ = 0, m = 0, s = +

n = 3, ℓ = 1, m = 0, s = -

n = 3, ℓ = 2, m = –1, s = +

n = 4, ℓ = 1, m = 0, s = -

Question 2/8

K₂O > Rb₂O > Cs₂O

N₂O₅ < NO₂ < N₂O₃

Li₂O < BeO < N₂O₅

Cl₂O₇ > P₂O₅ > SiO₂

Question 3/8

In adiabatic expansion of an ideal gas, temperature of system always decrease

In isothermal expansion of an ideal gas, temperature of a gas always remains constant

In a reversible adiabatic compression of an ideal gas, change in entropy of system is zero

In an irreversible adiabatic compression of an ideal gas, change in entropy of system is positive

Question 4/8

800 cal

200 cal

300 cal

400 cal

Question 5/8

Ca²⁺ has a smaller ionic radius than K⁺

2p^- orbital is lower in energy than 2s of Be atom

F is more electronegative than Cl atom

option 1 and option 3 are correct

Question 6/8

n = 3, l = 3, m = 0, s = +

n = 6, l = 2, m = –1, s = -

n = 6, l = 3, m = –2, s = +

option 1 and option 3 are correct

Question 7/8

ΔH_f(P) > ΔH_f (R)

ΔHC(P) > ΔHC (R)

ΔS_f(P) > ΔS_f (R)

option 2 and option 4 are correct

Question 8/8

Endothermic

Exothermic

Spontaneous at high temperature

option 1 and option 3 are correct

Question 1/8

n = 4, ℓ = 0, m = 0, s = +

n = 3, ℓ = 1, m = 0, s = -

n = 3, ℓ = 2, m = –1, s = +

n = 4, ℓ = 1, m = 0, s = -

Question 2/8

K2O > Rb2O > Cs2O

N2O5 < NO2 < N2O3

Li2O < BeO < N2O5

Cl2O7 > P2O5 > SiO2

Question 3/8

In adiabatic expansion of an ideal gas, temperature of system always decrease

In isothermal expansion of an ideal gas, temperature of a gas always remains constant

In a reversible adiabatic compression of an ideal gas, change in entropy of system is zero

In an irreversible adiabatic compression of an ideal gas, change in entropy of system is positive

Question 4/8

800 cal

200 cal

300 cal

400 cal

Question 5/8

Ca2+ has a smaller ionic radius than K+

2p- orbital is lower in energy than 2s of Be atom

F is more electronegative than Cl atom

option 1 and option 3 are correct

Question 6/8

n = 3, l = 3, m = 0, s = +

n = 6, l = 2, m = –1, s = -

n = 6, l = 3, m = –2, s = +

option 1 and option 3 are correct

Question 7/8

ΔHf(P) > ΔHf (R)

ΔHC(P) > ΔHC (R)

ΔSf(P) > ΔSf (R)

option 2 and option 4 are correct

Question 8/8

Endothermic

Exothermic

Spontaneous at high temperature

option 1 and option 3 are correct

K₂O > Rb₂O > Cs₂O

N₂O₅ < NO₂ < N₂O₃

Li₂O < BeO < N₂O₅

Cl₂O₇ > P₂O₅ > SiO₂

Ca²⁺ has a smaller ionic radius than K⁺

2p^- orbital is lower in energy than 2s of Be atom

ΔH_f(P) > ΔH_f (R)

ΔS_f(P) > ΔS_f (R)