Chemistry Test

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Chemistry Test - 2

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Weekly Quiz Competition

Question 1
2 / -0.25

The number of σand π-bonds in 2-formylbenzoic acid are respectively

A
10, 3

B
14, 3

C
12, 5

D
17, 5

Solution

Structure of 2 -formyl benzoic acid Is

Thus, it has 17 σand 5 πbonds.
Question 2
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Veronal is used as a/an

A
analgesic

B
antihistamine

C
antibiotic

D
tranquilizer

Solution

Veronal is the trade name for barbiturate drugs. It is used as tmnquiizor, these are the drugs used for the treatment of anxiety, fear, tension and mental illness. It ’s structure is
Question 3
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The oxidation number of sulphur in S₈molecule is

A
A. 6

B
B. 0

C
C. 2

D
D. 3

Solution

Oxidation number of sulphur is zero in S₈ molecule as it is a monatomic molecule.
Question 4
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Which of the following acts as an oxidising agent in hydrogen-oxygen fuel ceil?

A
A. H₂

B
B. O₂

C
C. KOH

D
D. C

Solution

Hydrogen-oxygen fuel cell is an electrochemical cell that converts the chemical energy of hydrogen which is a fuel and oxygen which act as an oxidising agent into electricity through a pair of redox reactions. Thus, option (b) is correct.
Question 5
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According to Werner ’s theory the geometry of the complex is determined by

A
only torn the primary valence in space

B
number and position of die primary valences in space

C
number and position of the secondary valences in space

D
only from the position of secondary valence in space

Solution

Werner ’s theory was used to describe the structure and formation of complex compounds or coordination compounds. According to this theory the primary valency gives the oxidation number and the secondary valency gives the coordination number. Also, the geometry of the complex is determined by the number and position of secondary valences in space as the ligand satisfying secondary valences are always Greeted towards the fixed position in space.
Question 6
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The correct representation of Nernst ’s equation for half-cell reaction Cu ²⁺(aq) + e^-→Cu⁺(aq) is

A

B

C

D
none

Solution

Key Idea General Nernst equation for a reaction is given as

For the half-cell Cu²⁺ (aq) + e^- →Cu⁺ (aq)

The correct Nernst 's equation is
Question 7
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Identify the equation in which change in enthalpy is equal to change in internal energy

A
A. 2H₂ O₂ (l) → 2H₂ O(l) + O₂ (g)

B
B. C(s) + O₂ (g) → CO₂ (g)

C
C. PCl₃ (g) → PCl₃ (g) + Cl₂ (g)

D
D. N₂ (g) + 3H₂ (g) →2NH₃ (g)

Solution

Key Idea Relationship between change in enthalpy and change in internal energy is given as:

ΔH = ΔU + Δn_g RT

Is the given options,

(a) 2H₂ O₂ (l) → 2H₂ O(l) + O₂ (g) Δn_g = 1

∴ ΔH = ΔU + RT

(b) C(s) + O₂ (g) → CO₂ (g)

Δn_g = 1 - 1 = 0

∴ ΔH = ΔU

(c) PCl₃ (g) → PCl₃ (g) + Cl₂ (g)

Δn_g = 2 - 1 = 1

∴ ΔH = ΔU + RT

(d) N₂ (g) + 3H₂ (g) → 2NH₃ (g)

Δn_g RT = 2 - 3 = -1

∴ ΔH = ΔU - RT

Equation given in option (b) has enthalpy change equal to internal change.
Question 8
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Which among the following does not form polyhalide ions?

A
A. Chlorine

B
B. Bromine

C
C. Iodine

D
D. Fluorine

Solution

When the halide ions combine with halogen molecules or interhalogen, univalent ions are obtained. These are known as polyhalide ions. Among the given options. F doesn't form polyhalide ion because it doesn't have d-orbitals and cannot show a higher oxidation state.
Question 9
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Which of following elements does not form amide when reacted with ammonia?

A
A. Li

B
B. Na

C
C. K

D
D. Rb

Solution

Lithium doesn't form amide when reacted with ammonia. It forms tetraammine lithium, Li(NH₃ )₄ .

The equation for the reaction is as follows:
Question 10
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α-chloro sodiumacetate on boiling with aqueous sodium nitrite gives

A
A. nitromethane

B
B. α-chloronitromethane

C
C. nitroethane

D
D. acetyl chloride

Solution

α - Chlorthe sodium acetate on boiling with aqueous sodium nitrite gives nitromethane. The reaction can be written as
Question 11
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How the molecular formula C4H10O represents many metameric ethers?

A
4

B
3

C
2

D
5

Solution

There are 4-metameric ethers that are represented by the molecular formula C₄ H₁₀ . Which are as follows
Question 12
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Which of the following metals occurs in native state?

A
A. Magnesium

B
B. Platinum

C
C. Potassium

D
D. Sodium

Solution

Among the given metals, platinum has the least reactivity thus, it occurs in the native state. While all other metals occur in their oxides, sulphides, and chloride forms.
Question 13
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The oxidation state of sulphur in H₂S₂O₇is

A
A. +4

B
B. +6

C
C. +5

D
D. +7

Solution

Let, the oxidation state of sulphur in H₂ S₂ O₇ be x.

∴ 2(+1) + 2(x) + 7(-2) = 0

2 + 2x - 14 = 0

2x = 12 x = +6
Question 14
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The percentage of unoccupied volume in simple cubic cell is

A
A. 52.40%

B
B. 32.00%

C
C. 47.60%

D
D. 68.04%

Solution

Key Idea Percentage of unoccupied volume = 100 - Packing effedency

Packing effedency = (volume of one atom/volume of cubic unit cell) x 100%

For simple cubic cells,

Packing effedency =

∴ Percentage of unoccupied volume in Scc = 100 - 52.4 = 47.6%
Question 15
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What is the density of water vapour at the boiling point of water?

A
A. 1 x 10^-4 g cm^-3

B
B. 1 g cm^-3

C
C. 6 x 10^-4 g cm^-3

D
D. 4 x 10^-4 g cm^-3

Solution

The density of water never has absolute value because it varies with temperature. The density of water vapour at boiling point (100⁰ C) of water is 6 x 10^-4 g cm^-3 .
Question 16
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Which reaction is useful in exchange for halogen in alkyl chloride by iodide?

A
A. Wurtz reaction

B
B. Finkelstein reaction

C
C. Reimer-Tiemann reaction

D
D. Wiliamson synthesis

Solution

The reaction that is useful in exchange for halogen in alkyl chloride by iodide is the Finkelstein reaction. This reaction is used in the preparation of alkyl iodide by the reaction of alkyl! Chloride, bromide with Mai in dry acetone.

e.g.,
Question 17
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Identify the amine formed when ethyl trimethyl ammonium iodide is treated with silver hydroxide and further heated strongly

A
C₂ H₅ N(CH₃ )₂

B
C₂ H₅ NH₂

C
(CH₃ )₃ N

D
CH₃ NH₂

Solution

Trimethyl amino is formed when ethyl trimethyl ammonium iodide is treated with silver hydroxide and further heated strongly.