Chemistry Test

Question 1
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Directions: The following question has four choices, out of which only one is correct.

Hydroxyl amine reduces iron(III) according to the following equation.

NH₂OH + Fe₂(SO₄)₃ → N₂ + H₂O + FeSO₄ + H₂SO₄

Which of the following statements is/are correct?

A
The acidity of hydroxyl amine is 1.

B
Equivalent weight of Fe₂(SO₄)₃ is M/2.

C
6 milliequivalent of Fe₂(SO₄)₃ is contained in 3 millimoles of ferric sulphate.

D
All of the above

Question 2
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Consider the reaction between potassium permanganate and a metal sulphite represented as follows.
\(Mn O _{4}^{-}+ SO _{3}^{2-}+ H ^{+} \rightarrow Mn ^{2+}+ S O _{4}^{2-}+ H _{2} O\)
Which of the following options about the process is correct?

A
1 mole of potassium permanganate oxidises 5 moles of the metal sulphite.

B
There is a net transfer of 5 electrons in the reaction.

C
20 mL of 0.5M KMnO₄ solution can neutralise 10 mL of 0.25 M metal sulphite.

D
50 mL of KMnO₄ can oxidise a 20 mL equimolar solution of the metal sulphite.

Question 3
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A non-volatile solute P dimerises in a solvent as 2P ⇌ P². If 'm' is the molality of the solute in the solvent, then the equilibrium constant of the given reaction is equal to :

A

\(\frac{K_{b}\left(K_{b} m+\Delta T_{b}\right)}{\left(2 \Delta T_{b}-K_{b} m\right)^{2}}\)

B

\(\frac{K_{b}\left(K_{b} m-\Delta T_{b}\right)}{\left(2 \Delta T_{b}-K_{b} m\right)^{2}}\)

C

\(\frac{K_{b}\left(K_{b} m-\Delta T_{b}\right)}{\left(2 \Delta T_{b}+K_{b} m\right)^{2}}\)

D

\(\frac{K_{b}\left(K_{b} m+\Delta T_{b}\right)}{\left(2 \Delta T_{b}+K_{b} m\right)^{2}}\)

Question 4
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An alloy of Pb-Ag weighing 1.08 g was dissolved in dilute HNO₃ and the total volume was made to be 100 mL. A silver electrode was dipped in the solution and the emf of the cell set up Pt(s), H₂(g) | H⁺(1M) || Ag⁺ (aq) | Ag(s) was 0.62 V. If E^ocell = 0.80 V, then what is the percentage of Ag in the alloy?

[At 25^oC, RT/F = 0.06]

A
25

B
2.50

C
10

D
50

Question 5
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Directions: The following question has four choices, out of which only one is correct.
Consider the cell Pt \(\left| H _{2}(0.75 atm )\right| HCl (0.25 M ) \| sn ^{4+}(0.60 M ), Sn ^{2+}(1.50 M ) \mid Pt\) Given \(E_{S n^{4}+/ S n^{2+}}^{\circ}=0.13 V ,\) which of the following statements is correct?

A
The cell reaction of the above cell is Sn²⁺ + 2H+→ Sn⁴⁺ + H₂.

B
E.M.F. of the cell is 2.15 V.

C
When Sn²⁺ | Sn⁴⁺ becomes 3.06 x 10⁵, the emf of the cell becomes zero.

D
The emf of cell is independent of the pH of the acid used.

Question 6
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Which of the following statements regarding the study of oxides of nitrogen is/are correct?

(i) Except N₂O₅, all oxides of nitrogen are endothermic as a large amount of energy is required to dissociate the stable molecules of oxygen and nitrogen.

(ii) Due to small electronegativity difference, N-O bond can be easily broken. Therefore, oxides of nitrogen are good reducing agents.

(iii) N₂O₃ is stable at only higher temperature.

(iv) All oxides of nitrogen are acidic in nature, except N₂O and NO.

A
Only (i)

B
(i) and (iv)

C
(i) and (ii)

D
All of these

Question 7
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What is the work done against the atmosphere when 25 grams of water vaprorizes at \(373 K\) against a constant external pressure of 1atm ? Assume that steam obeys perfect gas law. Given that the molar enthalpy of vaporization is \(9.72 \mathrm{kcal} / \mathrm{mole},\) what is the change of internal energy in the above process?

A
-1036.194 cal and 12,464.886 cal

B
921.4cal,11074cal

C
1025.6cal,12474.3cal

D
1129.3cal,10207cal

Question 8
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Directions: The following question has four choices, out of which only one is correct.

An organic compound containing 60.84% C, 40.35% H and the rest of O gives effervescence with NaHCO₃. It also gives deep violet colouration with FeCl₃ solution. The compound can be obtained from phenol by the action of CCl₄/KOH.

The compound contains

A
a phenolic OH group only

B
a carboxyl group only

C
both phenolic OH and carboxyl groups

D
None of these

Question 9
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The standard redox potentials \(\left( E ^{\circ}\right)\) of the following reactions are as follows.
I. \(MnO _{4}^{-}+8 H ^{+}+5 e ^{-} \rightarrow Mn ^{2+}+4 H _{2} O ; E ^{\circ}=1.51 V\)
II. \(Sn ^{2+} \rightarrow Sn ^{4+}+2 e ^{-} ; E ^{\circ}=-0.15 V\)
III. \(Cr _{2} O _{7}^{2-}+14 H ^{+}+6 e ^{-} \rightarrow 2 Cr ^{3+}+7 H _{2} O ; E ^{\circ}=1.33 V\)
\(IV . Ce ^{3+} \rightarrow Ce ^{4+}+ e ^{-} ; \quad E ^{ O }=-1.61 V\)
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⁺

Question 10
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How many litres of hydrogen gas can be generated by reacting 6.25 g of barium hydride with water at 20^oC and 755 mm Hg pressure, according to the following chemical equation?

BaH₂(s) + 2H₂O(l) → Ba(OH)₂(aq) + 2H₂(g)

A
1.60 L

B
2.158 L

C
0.799 L

D
0.2158 L

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Chemistry Test ...

Question 1

The acidity of hydroxyl amine is 1.

Equivalent weight of Fe2(SO4)3 is M/2.

6 milliequivalent of Fe2(SO4)3 is contained in 3 millimoles of ferric sulphate.

All of the above

Question 2

1 mole of potassium permanganate oxidises 5 moles of the metal sulphite.

There is a net transfer of 5 electrons in the reaction.

20 mL of 0.5M KMnO4 solution can neutralise 10 mL of 0.25 M metal sulphite.

50 mL of KMnO4 can oxidise a 20 mL equimolar solution of the metal sulphite.

Question 3

\(\frac{K_{b}\left(K_{b} m+\Delta T_{b}\right)}{\left(2 \Delta T_{b}-K_{b} m\right)^{2}}\)

\(\frac{K_{b}\left(K_{b} m-\Delta T_{b}\right)}{\left(2 \Delta T_{b}-K_{b} m\right)^{2}}\)

\(\frac{K_{b}\left(K_{b} m-\Delta T_{b}\right)}{\left(2 \Delta T_{b}+K_{b} m\right)^{2}}\)

\(\frac{K_{b}\left(K_{b} m+\Delta T_{b}\right)}{\left(2 \Delta T_{b}+K_{b} m\right)^{2}}\)

Question 4

25

2.50

10

50

Question 5

The cell reaction of the above cell is Sn2+ + 2H+→ Sn4+ + H2.

E.M.F. of the cell is 2.15 V.

When Sn2+ | Sn4+ becomes 3.06 x 105, the emf of the cell becomes zero.

The emf of cell is independent of the pH of the acid used.

Question 6

Only (i)

(i) and (iv)

(i) and (ii)

All of these

Question 7

-1036.194 cal and 12,464.886 cal

921.4cal,11074cal

1025.6cal,12474.3cal

1129.3cal,10207cal

Question 8

a phenolic OH group only

a carboxyl group only

both phenolic OH and carboxyl groups

None of these

Question 9

Cr2O72- > MnO-4

Ce4+ > Sn4+

Ce4+ > MnO-4

MnO-4 > Sn4+

Question 10

1.60 L

2.158 L

0.799 L

0.2158 L

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Question Analysis

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Equivalent weight of Fe₂(SO₄)₃ is M/2.

6 milliequivalent of Fe₂(SO₄)₃ is contained in 3 millimoles of ferric sulphate.

20 mL of 0.5M KMnO₄ solution can neutralise 10 mL of 0.25 M metal sulphite.

50 mL of KMnO₄ can oxidise a 20 mL equimolar solution of the metal sulphite.

The cell reaction of the above cell is Sn²⁺ + 2H+→ Sn⁴⁺ + H₂.

When Sn²⁺ | Sn⁴⁺ becomes 3.06 x 10⁵, the emf of the cell becomes zero.

Cr₂O₇^2- > MnO^-4

Ce⁴⁺ > Sn⁴⁺

Ce⁴⁺ > MnO^-4

MnO^-4 > Sn⁴⁺