Chemistry Test 4

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Chemistry Test 4

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Weekly Quiz Competition

Question 1
4 / -1

Which one of the following represents an impossible arrangement?

n l m s

A
3 2 –2 ½

B
4 0 0 ½

C
3 2 –3 ½

D
5 3 0 ½

Solution

Because n > l, so m = – l to + l
Question 2
4 / -1

In order to refine blister copper it is melted in a furnace and is stirred with green logs of wood. The purpose is

A
To expel the dissolved gases in blister copper

B
To bring the impurities to surface and oxidize them

C
To increase the carbon content of copper

D
To reduce the metallic oxide impurities with hydrocarbon gases liberated from the wood.

Solution

The blister copper is melted in reverberatory furnace and stirred with poles of green wood. Any oxide of copper formed is reduced to metallic copper by the reducing hydrocarbons of the wood. The process is called fire refining or poling.
Question 3
4 / -1

Which of the following is a double salt

A
Carnallite

B
Mohr’s salt

C
Alum

D
All are correct

Solution

Carnalite KCl.MgCl₂.6H₂O

Mohr's salt – FeSO₄.(NH₄)₂ SO₄.6H₂O

Alum – K₂SO₄, Al₂(SO₄)₃. 24H₂O

all are double salts.
Question 4
4 / -1

In the zinc blende structure (ZnS), S² – adopt ccp arrangement and Zn²⁺occupy –

A
Octahedral sites

B
Hexagonal sites

C
Tetrahedral sites

D
Both octahedral and tetrahedral sites

Solution

Zinc blende (ZnS) has simple cubic arrangement.

So Zn⁺² occupy tetrahedral sites.
Question 5
4 / -1

Galvanisation means:

A
decomposition of Zn on Fe

B
decomposition of Al on Fe

C
decomposition of Sn on Fe

D
decomposition of Cu on Fe

Solution

Galvanisation is a process in which iron is protected by forming a layer of Zn on Fe.