Chemistry Test 205

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Chemistry Test 205

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Weekly Quiz Competition

Question 1
4 / -1

Nickel is purified by

A
Mond's process

B
Bosch process

C
Bessemer process

D
Lablance process

Solution

The Mond process, sometimes known as the carbonyl process, is a technique created by Ludwig Mond in 1890, to extract and purify nickel. The process was used commercially before the end of the 19th century. This process converts nickel oxides into pure nickel.
Question 2
4 / -1

The oxidation state of Cr in [Cr(NH₃)₄Cl₂]⁺ is

A
0

B
+1

C
+3

D
+2

Solution

Applying sum of individual charge = charge on molecule

x+(0)×4 + (-1)×2 = +1

x=3
Question 3
4 / -1

Which of the following noble gas is least polarisable?

A
He

B
Xe

C
Ar

D
Ne

Solution

Helium is the least polarizable noble gas due to presence of weakest Van der Waal's forces.
Question 4
4 / -1

A
2-Chloro-4-ethyl-3-methyl hept-2-ene-6-yne

B
6-Chloro-4-ethyl-5-methyl hept-1-yn-5-ene

C
6-Chloro-4-ethyl-5-methyl hept-5-en-1-yne

D
2-Chloro-4-ethyl-3-methyl hept-6-yn-6-ene

Solution

Correct name is 2-Chloro-4-ethyl-3-methyl hept-2-ene-6-yne
Question 5
4 / -1

When HCl gas is passed through a saturated solution of common salt, pure NaCl is precipitated because

A
HCl is highly ionised in solution

B
HCl is highly soluble in water

C
The solubility product of NaCl is lowered by HCl

D
The ionic product of [Na⁺][Cl⁻] exceeds the solubility products of NaCl

Solution

When hydrogen chloride gas (HCl) is circulated through the saturated solution.

HCl and NaCl dissociate into their respective ions as:

NaCl → Na⁺+ Cl^-

HCl → H⁺ + Cl^-

The concentration of Cl⁻ ions increases considerably in solution due to ionization HCl.

Hence, the ionic product [Na⁺][Cl⁻] exceeds the solubility product of sodium chloride and, therefore, pure sodium chloride precipitates out from the solution.
Question 6
4 / -1

Which of the following pair represents stereoisomerism?

A
chain isomerism and rotational isomerism

B
optical isomerism and geometric isomerism

C
linkage isomerism and geometric isomerism

D
structural isomerism and geometric isomerism

Solution

Optical isomerism (such as enantiomers and diastereoisomers) and geometric isomerism (cis trans isomerism) represents stereoisomerism.

Stereoisomers have the same molecular formula and same connectivity of atoms, but differ in the orientations of atoms.

Chain isomerism, position isomerism and functional group isomerism represents structural isomerism.
Question 7
4 / -1

Which of the following pair of elements belongs to same period of the periodic table?

A
P, Se

B
Mg, Sb

C
Ag, Cl

D
Ca, Zn

Solution

Calcium and zinc both belong to the same period, i.e Period 4
Question 8
4 / -1

Natural rubber is a polymer of

A
trans-isoprene

B
cis-isoprene

C
both

D
none

Solution

Natural rubber is from the monomer cis-isoprene (2-methyl-1,3-butadiene).

It is an addition polymer that is obtained as a milky white fluid known as latex from a tropical rubber tree.
Question 9
4 / -1

In view of their low ionization energies, the alkali metals are

A
weak oxidising agent

B
strong reducing agents

C
strong oxidising agents

D
weak reducing agents

Solution

Alkali metals can readily lose their lone electron to form +1 oxidation state and can easily ionize this electron and this ns1 configuration results in alkali metals to have large ionic and atomic radii and they have high second ionization energy. This ionization energy decreases down the group and act as strong reducing agent.
Question 10
4 / -1

100 ml of a liquid A was mixed with 25 ml of a liquid B to give B to give a non-ideal solution of A-B mixture. The volume of this mixture would be

A
75 ml

B
125 ml

C
Close to 125 ml

D
Just more than 125 ml

Solution

For non-ideal solution, ΔV_mix< 0.

Final volume decreases due to negative deviation from original volume 125 ml.

Hence, total volume will be little less than (100 + 25 = 125 mL).

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Re-Attempt Weekly Quiz Competition

Chemistry Test 205

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Chemistry Test 205

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SHARING IS CARING

Question 1

Mond's process

Bosch process

Bessemer process

Lablance process

Solution

Question 2

0

+1

+3

+2

Solution

Question 3

He

Xe

Ar

Ne

Solution

Question 4

2-Chloro-4-ethyl-3-methyl hept-2-ene-6-yne

6-Chloro-4-ethyl-5-methyl hept-1-yn-5-ene

6-Chloro-4-ethyl-5-methyl hept-5-en-1-yne

2-Chloro-4-ethyl-3-methyl hept-6-yn-6-ene

Solution

Question 5

HCl is highly ionised in solution

HCl is highly soluble in water

The solubility product of NaCl is lowered by HCl

The ionic product of [Na⁺][Cl⁻] exceeds the solubility products of NaCl

Solution

Question 6

chain isomerism and rotational isomerism

optical isomerism and geometric isomerism

linkage isomerism and geometric isomerism

structural isomerism and geometric isomerism

Solution

Question 7

P, Se

Mg, Sb

Ag, Cl

Ca, Zn

Solution

Question 8

trans-isoprene

cis-isoprene

both

none

Solution

Question 9

weak oxidising agent

strong reducing agents

strong oxidising agents

weak reducing agents

Solution

Question 10

75 ml

125 ml

Close to 125 ml

Just more than 125 ml

Solution

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