Chemistry Test

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Chemistry Test - 7

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Weekly Quiz Competition

Question 1
3 / -1

Among the following the ambident nucleophile is:

A
iodide

B
alkoxy

C
hybride

D
cyanide

Solution

Cyanide (CN⁻) ion act as an ambident nucleophile. This is because it acts as a ligand form of 'CN' also and 'NC' also. Thus it has two binding site.
Hence option D is the correct answer.
Question 2
3 / -1

The spectrum of helium is expected to be similar to that of:

A
Li⁺

B
He

C
H

D
Na

Solution

No. of electrons in Li⁺ & He = 2. Therefore the spectrum will be same for both of them with same no. of electrons.
Hence option A is the correct answer.
Question 3
3 / -1

The element with atomic number 111 might belong to which of the following group?

A
Chromium

B
Scandium

C
Copper

D
Titanium

Solution

Roentgenium- [Rn] 5f¹⁴ 6d⁹ 7s²
Rg is a member of the 7th period and is placed in the group II elements, Copper belongs to Group II.
Hence option C is the correct answer.
Question 4
3 / -1

An organic compound A(C₄H₉Cl) on reaction with Na/diethyl ether gives a hydrocarbon which on monochlorination gives only one chloro derivative then, A is:

A
isobutyl chloride

B
secondary butyl chloride

C
tertiary butyl chloride

D
n-butyl chloride

Solution

An organic compound A(C₄H₉Cl) on reaction with Na/Na/ diethyl ether gives a hydrocarbon which on monochlorination gives only one chloro derivative then, AA is tertiary butyl chloride. The reaction of tertiary butyl chloride with Na/Na/ diethyl ether to form 2,2,3,3-tetramethylbutane is an example of Wurtz coupling. The product 2,2,3,3-tetramethylbutane has only one type of H atom which is replaced with chlorine to give only one monochloro derivative.

Hence option C is the correct
Question 5
3 / -1

How many facts related to CHCL₃ + ethyl methyl ketone solutions are correct?___

A
It shows a negative deviation

B
It forms a maximum boiling azeotropic mixture

C
ΔS> 0

D
All of the above

Solution

Negative deviation is seen as A-B interactions are stronger than A-A interactions, because of this - a max boiling azeotropic mixture can be formed

Entropy of mixing is always positive and gibb's energy is negative as it is a spontaneous process.

Option D is correct.
Question 6
3 / -1

Which of the following has the maximum number of unpaired d-electrons?

A
Zn²⁺

B
Fe²⁺

C
Ni³⁺

D
Cu⁺

Solution
Question 7
3 / -1

Identify X

A

B

C

D

Solution

In this reaction, alkyl position is acquired by halide due to more reactivity of alkyl alcohol. The phenolic −OH is involved in resonance.
The reaction is as given in the diagram.
Hence option A is the correct answer.
Question 8
3 / -1

The vapour pressure of a dilute solution of a solute is influenced by:

A
Temperature of solution

B
Mole fraction of solute

C
Degree of dissociation of solute

D
All of the above

Solution

Vapor pressure increases with an increase in temperature, it gets lowered as the mole fraction of a non-volatile solute increases.

The degree of dissociation also affects the vapor pressure of a solution, as vapor pressure is a colligative property. When disassociation happens, the number of ions in solution are greater than what was expected, so the vapor pressure gets lowered even more than expected. This is measured by Van't Hoff factor -'i'.

Hence option D is the correct answer.
Question 9
3 / -1

Propane-I-ol can be prepared from propene by :

A
H₂O/H₂SO₄

B
Conc.H₂SO₄

C
B₂H₆ followed by H₂O₂/OH

D
CH₃CO₂H/H₂SO₄

Solution

The hydroboration of propene followed by oxidation gives propanol. The reagent used for hydroboration is diborane. The reagent used for oxidation is alkaline hydrogen peroxide solution.

Hence option C is the correct answer.
Question 10
3 / -1

Iodine reacts with hypo to give:

A
NAI

B
Na₂SO₃

C
Na₂S₄O₅

D
Na₂ SO₄

Solution

lodine and hypo react to produce \(N a_{2} S_{4} O_{6}\) and \(N a I\). Balanced equation:
\(I_{2}\) is reduced and sulphur is oxidised. Half reduction reaction: \(I_{2}+2 e^{-} \rightarrow 2 I\) Half oxidation reaction: \(2 S_{2} O_{3}^{2-} \rightarrow S_{4} O_{6}^{2-}+2 e^{-}\)

Hence option A is the correct answer.
Question 11
3 / -1

There are two samples of HCl having molarity 1M and 0.25N. Find the volume of these sample taken in order to prepare 0.75N HCl solution (Assume no water is used):

A
20 mL, 10 mL

B
100 mL, 50 mL

C
40 mL, 20 mL

D
All of the above

Solution
Question 12
3 / -1

Gaseous adsorption on solid surface is exothermic because adsorption brings in :

A
increase in enthalpy

B
increase in entropy

C
increase in free energy

D
interaction forces developed between gaseous molecule and solid surface

Solution

Gaseous adsorption on solid surface is exothermic because adsorption brings in interaction forces developed between gaseous molecules and solid surface. Heat energy is released during development of these interaction forces.
Hence option D is the correct answer.
Question 13
3 / -1

Which property of colloids is not dependent on the charge on colloidal particles?

A
Coagulation

B
Electrophoresis

C
Electro-osmosis

D
Tyndall effect

Solution

Tyndall effect is due to scattering of light and not due to charge. Thus, Tyndall effect is not dependent on the charge on colloidal particles. All other properties are dependent on the electric charge.
Hence option D is the correct answer.
Question 14
3 / -1

A group of atoms can function as a ligand only when :

A
it is a small molecule

B
it has an unshared electron pair

C
it is a negatively charged ion

D
it is a positively charged ion

Solution

Ligand is a group of atoms which has unpaired electron pair which can be donated.
Hence option B is the correct answer.
Question 15
3 / -1

Match the columns

A
I-d, II-a, III-c, IV-b

B
I-c, II-b, III-d, IV-a

C
I-b, II-c, III-a, IV-d

D
I-a, II-d, III-b, IV-c

Solution

Dust is a solid aerosol, dispersion medium in it is gas and dispersed phase is solid. Opal is a gel and dispersed phase in it is liquid and the dispersion medium is solid. Toothpaste is a sol where dispersed phase is solid and the dispersion medium is liquid. Also, milk is the emulsion.
Hence option B is the correct answer.