Chemistry Test

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Chemistry Test - 12

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Weekly Quiz Competition

Question 1
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A
Zinc can be oxidized by carbon monoxide.

B
Carbon monoxide can be reduced by zinc.

C
Zinc oxide can be reduced by graphite.

D
Both statements (1) and (2) are correct.

Solution

Zinc oxide can be reduced by graphite.
Question 2
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Some standard reduction potentials are given below:

Which of the following statements is correct under standard conditions?

A
Bromine will oxidise chloride ions to chlorine.

B
Manganate (VII) ions in acid solutions will oxidise chloride ions to chlorine.

C
Manganate (VII) ions in acid solutions will oxidise chromium (III) ions to dichromate (IV) ions.

D
Dichromate (VI) ions in acid solutions will oxidise manganous (II) ion.

Solution

Manganate (VII) ions in acid solutions will oxidise chloride ions to chlorine.
Question 3
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The standard redox potentials (E^o) of the following reactions are as follows.

!. $\mathrm{MnO}_{4}^{-}+8 \mathrm{H}^{+}+5 \mathrm{e}^{-} \rightarrow \mathrm{Mn}^{2+}+4 \mathrm{H}_{2} \mathrm{O}: \mathrm{E}^{8}=1.51 \mathrm{V}$

11. $\operatorname{Sn}^{2}+\rightarrow \operatorname{Sn}^{4+}+2 e^{-} ; E^{8}=-0.15 V$

III. $\mathrm{Cr}_{2} \mathrm{O}_{2}^{2-}+14 \mathrm{H}^{+}+6 \mathrm{e}^{-} \rightarrow 2 \mathrm{Cr}^{3+}+7 \mathrm{H}_{2} \mathrm{O} ; \mathrm{E}^{8}=1.33 \mathrm{V}$

$\mathrm{IV} \cdot \mathrm{Ce}^{3+} \rightarrow \mathrm{Ce}^{4+}+\mathrm{e}^{-} \quad \quad \mathbb{E}^{8}=-1.61 \mathrm{V}$

In which of the following options is the oxidising power of the various ions wrongly related?

A
Cr₂O₇^2- > MnO^-₄

B
Ce⁴⁺ > Sn⁴⁺

C
Ce⁴⁺ > MnO^-₄

D
MnO^-₄ > Sn⁴⁺

Solution

Cr₂O₇^2-> MnO^-4
Question 4
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Directions: The following question has four choices out of which ONLY ONE is correct.

The reduction electrode potential (E) of 0.1 M solution of M⁺ ions (E^o_RP = – 2.36V) is

A
- 4.82 V

B
- 2.41 V

C
+ 2.41 V

D
None of these

Solution

- 2.41 V
Question 5
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Directions: The following question has four choices out of which ONLY ONE is correct.

Standard electrode potential of cell H₂ | H⁺ || Ag⁺ I Ag is
(Given = E^o Ag⁺/Ag = 0.80 V)

A
0.8 V

B
- 0.8 V

C
- 1.2 V

D
1.2 V

Solution

0.8 V
Question 6
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Directions: The following question has four choices, out of which ONLY ONE is correct.

Consider the following half reactions:

$\mathrm{Zn}^{2+}+2 \mathrm{e}^{*} \rightarrow \mathrm{Zn}(\mathrm{s}) ; \mathrm{E}^{8}=-0.76 \mathrm{V}$

$\mathrm{Cu}^{2+}+2 \mathrm{e}^{-} \rightarrow \mathrm{Cu}(\mathrm{s}) ; \mathrm{E}^{8}=-0.34 \mathrm{V}$

Which of the following reactions is spontaneous?

A
$Z n^{2+}+C u \rightarrow Z n+C u^{2+}$

B
Cu²⁺ + Zn $\to$ Cu + Zn²⁺

C
Zn²⁺ + Cu²⁺ $\to$ Zn + Cu

D
None of these

Solution

Cu²⁺+ Zn $\to$ Cu + Zn²⁺
Question 7
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If the initial concentration of a reactant of a zero order reaction is reduced by half, the time for half decomposition

A
remains the same

B
increases to twice its original value

C
decreases to half its original value

D
increases to four times its original value

Solution

the time for half decompositiondecreases to half its original value.
Question 8
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Directions: The following question has four choices out of which ONLY ONEis correct.

For the decomposition of $\mathrm{N}_{2} \mathrm{O}_{5}$, the plot of the logarithm (to the base 10 ) of the pressure of $\mathrm{N}_{2} \mathrm{O}_{5}$ in torr (log $\mathrm{P}_{\mathrm{N}_{2} 0_{0}}$ ) against time (t) gives a straight line with slope $-4.39 \times 10^{-3} \mathrm{min}^{-1}$ and intercept 0.27

Concluding from the given data, which of the following statements is incorrect?

A
The reaction is a first order one.

B
The rate constant of the reaction is 1.01 $\times$ 10^–2 min^–1.

C
Initial pressure of N₂O₅ was 0.27 torr.

D
The reaction will be 99.9% complete in 686 minutes.

Solution

Initial pressure of N₂O₅was 0.27 torr.
Question 9
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Directions: The following question has four choices, out of which ONLY ONE is correct.

The decomposition of SO₂Cl₂ to SO₂ and Cl₂ is a first order reaction. When 0.10 mol of SO₂Cl₂ (g) is heated at 600 K in a 1.0 L vessel, the total pressure changes from 4.91 atm to 9.50 atm in 16 hours. Which of the following statements is correct?

A
Rate constant of the reaction is 0.17 hour^–1.

B
Half-life of the reaction is 2.1 hours.

C
Total pressure after 4 hours will be 9.0 atm.

D
The reaction will be completed in 32 hours.

Solution

Rate constant of the reaction is 0.17 hour^–1.
Question 10
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Li nucleus has three protons and four neutrons. Mass of lithium nucleus is 7.016005 amu. Mass of proton is 1.007277 amu and mass of neutron is 1.008665 amu. Mass defect for lithium nucleus in amu is

A
0.04048 amu

B
0.04059 amu

C
0.04062 amu

D
0.04055 amu

Solution

Correct Answer : 0.04048 amu

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Chemistry Test - 12

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Chemistry Test - 12

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Question 1

Zinc can be oxidized by carbon monoxide.

Carbon monoxide can be reduced by zinc.

Zinc oxide can be reduced by graphite.

Both statements (1) and (2) are correct.

Solution

Question 2

Bromine will oxidise chloride ions to chlorine.

Manganate (VII) ions in acid solutions will oxidise chloride ions to chlorine.

Manganate (VII) ions in acid solutions will oxidise chromium (III) ions to dichromate (IV) ions.

Dichromate (VI) ions in acid solutions will oxidise manganous (II) ion.

Solution

Question 3

Cr2O72- > MnO-4

Ce4+ > Sn4+

Ce4+ > MnO-4

MnO-4 > Sn4+

Solution

Question 4

- 4.82 V

- 2.41 V

+ 2.41 V

None of these

Solution

Question 5

0.8 V

- 0.8 V

- 1.2 V

1.2 V

Solution

Question 6

\(Z n^{2+}+C u \rightarrow Z n+C u^{2+}\)

Cu2+ + Zn →Cu + Zn2+

Zn2+ + Cu2+→Zn + Cu

None of these

Solution

Question 7

remains the same

increases to twice its original value

decreases to half its original value

increases to four times its original value

Solution

Question 8

The reaction is a first order one.

The rate constant of the reaction is 1.01 × 10–2 min–1.

Initial pressure of N2O5 was 0.27 torr.

The reaction will be 99.9% complete in 686 minutes.

Solution

Question 9

Rate constant of the reaction is 0.17 hour–1.

Half-life of the reaction is 2.1 hours.

Total pressure after 4 hours will be 9.0 atm.

The reaction will be completed in 32 hours.

Solution

Question 10

0.04048 amu

0.04059 amu

0.04062 amu

0.04055 amu

Solution

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Cr₂O₇^2- > MnO^-₄

Ce⁴⁺ > Sn⁴⁺

Ce⁴⁺ > MnO^-₄

MnO^-₄ > Sn⁴⁺

Cu²⁺ + Zn $\to$ Cu + Zn²⁺

Zn²⁺ + Cu²⁺ $\to$ Zn + Cu

The rate constant of the reaction is 1.01 $\times$ 10^–2 min^–1.

Initial pressure of N₂O₅ was 0.27 torr.

Rate constant of the reaction is 0.17 hour^–1.