Chemistry Test

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Chemistry Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following statements regarding ferric salts is not correct?

A
In the vapour phase, ferric chloride corresponds to the dimer structure.

B
The aqueous solution of ferric salt is alkaline.

C
Ferric chloride is used as an antiseptic.

D
The formula of ferric alum is Fe₂(SO₄)₃.(NH₄)₂SO₄.24H₂O.

Solution

The aqueous solution of ferric salt is acidic owing to the reaction: Fe³⁺ + H₂O ⇌ Fe(OH)²⁺ + H⁺

Hence the correct answer is option (b).
Question 2
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Which of the following forms non-stoichiometric hydrides?

A
P

B
Na

C
Pt

D
Ca

Solution

Metallic or non-stoichiometric hydrides can only be formed by d-block and f-block elements like Pt, Pd, La, Y etc. Rest of the elements form either ionic or molecular hydride.

Hence the correct answer is option (c).
Question 3
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In diborane:

A
2 bridged hydrogen and four terminal hydrogen are present

B
3 bridged hydrogen and three terminal hydrogen are present

C
4 bridged hydrogen and two terminal hydrogen are present

D
1 bridged hydrogen and one terminal hydrogen are present

Solution

Diborane has 2 bridged hydrogen and four terminal hydrogen atoms.

Hence the correct answer is option (a).
Question 4
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Borazole is an isostere of

A
Benzene

B
Propane

C
aphthalene

D
Phenol

Solution

Both have number of electrons and similar structure and properties.

Isosteres are molecules or ions of similar size containing the same number of atoms and valence electrons, e.g., O^2-, F^-, Ne.

Hence the correct answer is option (a).
Question 5
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Which one out of the following is not a NAD⁺ requiring enzyme?

A
Lactate dehydrogenase

B
Pyruvate dehydrogenase complex

C
Maltate dehydrogenase

D
Acyl co-A dehydrogenase

Solution

Acyl co-A dehydrogenase is not a NAD⁺ requiring enzyme.

Hence the correct answer is option (d).
Question 6
1 / -0

A fixed mass &aposm&apos of a gas is subjected to transformation of states from K to L to M to N and back to K as shown in the figure.

The succeeding operations that enable this transformation of states are

A
heating, cooling, heating, cooling

B
cooling, heating, cooling, heating

C
heating, cooling, cooling, heating

D
cooling, heating, heating, cooling

Solution

K – L: heating, isobaric

L – M: cooling, isochoric

M – N: cooling, isobaric

N – K: heating, isochoric

Hence the correct answer is option (c).
Question 7
1 / -0

Which of the following has highest bond dissociation energy?

A
H₂

B
D₂

C
HD

D
All of these have identical bond dissociation energy

Solution

Heavier isotopes always form stronger bond and thus, their bond dissociation energy is higher than lighter isotopes.

So, bond dissociation energy of T₂> D₂ > H₂

Hence the correct answer is option (b).

Question 8

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Directions: Match the transition metal oxides given in column (I) with their uses given in column (II). Any given metal oxide in Column (I) can have multiple correct matchings with column (II).

Column–(I)	Column–(II)
(A) MnO₂	(a) High quality magnetic recording tapes
(B) CrO₂	(b) Black
(C) Ag₂O	(c) Black solid turns intense purple in aqueous solution
(D) MnO₄^–	(d) Amphoteric
	(e) Pyrolusite

(A) — (d), (e); (B) — (a); (C) — (b); (D) — (c)

(A) — (c), (d); (B) — (a); (C) — (b); (D) — (d)

(A) — (a), (c); (B) — (d); (C) — (e); (D) — (b)

(A) — (c), (d); (B) — (e); (C) — (b); (D) — (d)

Solution

(A) MnO₂ is amphoteric in nature [(d)] and is the main constituent of pyrolusite [(e)]. So, (A) — (d), (e).

(B) CrO₂ is ferromagnetic and is used in high quality magnetic recording tapes [(a)]. Thus (B) — (a).

(C) Ag₂O is black though most of the compounds of Ag⁺ are colourless. This colour comes from the fact that Ag⁺ ion polarises O^2-ion increasing covalent character of the bond [(b)]. Thus, (C) — (b).

(D) MnO₄^- has an intense purple colour in solution though the solid is almost black. The colour arises due to charge transfer. So, (D) — (c).

Hence the correct answer is option (a).

Question 9
1 / -0

After dividing a substance into two equal parts, which of the following properties of the substance reduces to half?

A
Density

B
Internal energy

C
Pressure

D
Temperature

Solution

Yes, it is the correct answer as the internal energy of a substance depends on its mass. After dividing the substance into two equal parts, the internal energy of each part reduces to half. It is an extensive property.

Hence the correct answer is option (b).
Question 10
1 / -0

Which out of the following has the highest redox potential?

A
NAD

B
FMN

C
FAD

D
O₂

Solution

O₂ has the highest redox potential.

Hence the correct answer is option (d).

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Chemistry Test - 2

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Chemistry Test - 2

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Question 1

In the vapour phase, ferric chloride corresponds to the dimer structure.

The aqueous solution of ferric salt is alkaline.

Ferric chloride is used as an antiseptic.

The formula of ferric alum is Fe2(SO4)3.(NH4)2SO4.24H2O.

Solution

Question 2

P

Na

Pt

Ca

Solution

Question 3

2 bridged hydrogen and four terminal hydrogen are present

3 bridged hydrogen and three terminal hydrogen are present

4 bridged hydrogen and two terminal hydrogen are present

1 bridged hydrogen and one terminal hydrogen are present

Solution

Question 4

Benzene

Propane

aphthalene

Phenol

Solution

Question 5

Lactate dehydrogenase

Pyruvate dehydrogenase complex

Maltate dehydrogenase

Acyl co-A dehydrogenase

Solution

Question 6

heating, cooling, heating, cooling

cooling, heating, cooling, heating

heating, cooling, cooling, heating

cooling, heating, heating, cooling

Solution

Question 7

H2

D2

HD

All of these have identical bond dissociation energy

Solution

Question 8

(A) — (d), (e); (B) — (a); (C) — (b); (D) — (c)

(A) — (c), (d); (B) — (a); (C) — (b); (D) — (d)

(A) — (a), (c); (B) — (d); (C) — (e); (D) — (b)

(A) — (c), (d); (B) — (e); (C) — (b); (D) — (d)

Solution

Question 9

Density

Internal energy

Pressure

Temperature

Solution

Question 10

NAD

FMN

FAD

O2

Solution

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The formula of ferric alum is Fe₂(SO₄)₃.(NH₄)₂SO₄.24H₂O.

H₂

D₂

O₂