General Principles and Processes of Isolation of Elements Test

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General Principles and Processes of Isolation of Elements Test - 30

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Question 1
1 / -0

Which is wrongly mached:

A
Gun metal- $$\displaystyle Cu+Zn+Sn$$

B
Duralumin $$\displaystyle Cu+Al+Mn$$

C
German silver $$\displaystyle Cu+Zn+Ni$$

D
Electron $$\displaystyle Pb+Sn$$

Solution

Gunmetal, also known as red brass is a type of bronze – an alloy of copper (85%), tin (5%), zinc (5%) and lead (5%)

Duralumin is an alloy of aluminum containing traces of copper, magnesium and/or manganese.

German silver is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc.

Nickel silver is named for its silvery appearance, but it contains no elemental silver unless plated.
Question 2
1 / -0

Composition of azurite mineral is:

A
$$CuCO_3.CuO$$

B
$$Cu(HCO_3)_2.Cu(OH)_2$$

C
$$2CuCO_3.Cu(OH)_2$$

D
None of these

Solution

Azurite is one of the basic copper (II) carbonate minerals, the other being bright green malachite. Simple copper carbonate (CuCO3) is not known to exist in nature. Azurite has the formula $$Cu(CO_3)_2(OH)_2$$ with the copper (II) cations linked to two different anions, carbonate and hydroxide.
Hence the composition of azurite mineral is $$2CuCO_3.Cu (OH)_2$$
Question 3
1 / -0

Predict the mode of occurrence of the following metals:
The correct answer is:

A
$$Na \rightarrow $$ combined form

B
$$Fe \rightarrow $$ combined form

C
$$Au \rightarrow $$ combined form

D
none of these

Solution

Sodium (alkali metal) is highly reactive and so, it occurs as a compound i.e. in combined form like NaCl.
Question 4
1 / -0

Volatile metals are purified by :

A
oxidation

B
distillation

C
liquation

D
electrolytic refining

Solution

Volatile metals or crude oil for fuels employs the process of industry distillation. It is the process of separating the component substances from a liquid mixture by selective evaporation and condensation. It is based on the property of differences in the volatility of mixtures' components.
Question 5
1 / -0

Aquaregia is ___ part conc. HCI and ___ part conc. $$HNO_3$$.

A
one,three

B
one,one

C
three,three

D
three,one

Solution

Aqua regia is three parts conc. $$ HCI$$ and one part conc. $$HNO_3$$.

$$HNO_3 + 3HCl \rightarrow NOCl + 2H_2O + 2CI$$

So, the correct option is $$D$$
Question 6
1 / -0

Identify the process to which the following reaction belongs :

$$\displaystyle { Al }_{ 2 }{ O }_{ 3 }.{ 2H }_{ 2 }O+{ Na }_{ 2 }{ CO }_{ 3 }\longrightarrow { 2NaAlO }_{ 2 }+{ 2H }_{ 2 }O+{ CO }_{ 2 }$$

$$\displaystyle { 2NaAlO }_{ 2 }+{ 2H }_{ 2 }O+{ CO }_{ 2 } \underrightarrow { 50-{ 60 }^{ o }C } { Al }_{ 2 }{ O }_{ 3 }.{ 2H }_{ 2 }O+{ Na }_{ 2 }{ CO }_{ 3 }$$

A
Hall's process

B
Baeyer's process

C
Serpeck's process

D
None of these

Solution

Hall's Process: (Red bauxite)
Bauxite one + $$Na_2CO_3 \xrightarrow{Fused} NaAlO_2$$
$$\downarrow $$ extracted with water
Solution
$$\downarrow$$ warmed $$50^o - 60^oC$$
$$CO_2$$ is circulated
$$\downarrow$$
$$Al(OH)_3 + Na_2CO_3$$
Question 7
1 / -0

Which one of the following metals can not be extracted by using Al as a reducing agent ________________.

A
$$\displaystyle Na$$ from $$\displaystyle { Na }_{ 2 }O$$

B
$$\displaystyle Cr$$ from $$\displaystyle { Cr }_{ 2 }{ O }_{ 3 }$$

C
$$\displaystyle Mn$$ from $$\displaystyle { MnO }_{ 2 }$$

D
$$\displaystyle Fe$$ from $$\displaystyle { Fe }_{ 2 }{ O }_{ 3 }$$

Solution

As sodium (alkali metal) is more reactive than Al so it cannot be extracted from $$Na_2O$$ by using Al as a reducing agent.
Question 8
1 / -0

Which of the following metal is present in native state?

A
platinum

B
iron

C
potassium

D
copper

Solution

Very few metals exist in the free or native state. Only metals like gold, platinum and mercury are occasionally found in the free state i.e in the pure form.
Question 9
1 / -0

The most abundant metal in the earth crust is:

A
Copper

B
Silver

C
Aluminium

D
Silicon

Solution

Aluminum is the most abundant metal in the earth's crust but it is never found free in nature. Silicon is not a metal.
Question 10
1 / -0

Which of the following is not a property of aluminium?

A
Good conductor of heat and electricity

B
It is malleable

C
It is heavy

D
It is ductile

Solution

A. Aluminium is a good thermal and electrical conductor.
B. It can be drawn into thin sheets
C. It is very lightweight, soft and durable
D. It can be used to make wires

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General Principles and Processes of Isolation of Elements Test - 30

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General Principles and Processes of Isolation of Elements Test - 30

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Question 1

Gun metal- $$\displaystyle Cu+Zn+Sn$$

Duralumin $$\displaystyle Cu+Al+Mn$$

German silver $$\displaystyle Cu+Zn+Ni$$

Electron $$\displaystyle Pb+Sn$$

Solution

Question 2

$$CuCO_3.CuO$$

$$Cu(HCO_3)_2.Cu(OH)_2$$

$$2CuCO_3.Cu(OH)_2$$

None of these

Solution

Question 3

$$Na \rightarrow $$ combined form

$$Fe \rightarrow $$ combined form

$$Au \rightarrow $$ combined form

none of these

Solution

Question 4

oxidation

distillation

liquation

electrolytic refining

Solution

Question 5

one,three

one,one

three,three

three,one

Solution

Question 6

Hall's process

Baeyer's process

Serpeck's process

None of these

Solution

Question 7

$$\displaystyle Na$$ from $$\displaystyle { Na }_{ 2 }O$$

$$\displaystyle Cr$$ from $$\displaystyle { Cr }_{ 2 }{ O }_{ 3 }$$

$$\displaystyle Mn$$ from $$\displaystyle { MnO }_{ 2 }$$

$$\displaystyle Fe$$ from $$\displaystyle { Fe }_{ 2 }{ O }_{ 3 }$$

Solution

Question 8

platinum

iron

potassium

copper

Solution

Question 9

Copper

Silver

Aluminium

Silicon

Solution

Question 10

Good conductor of heat and electricity

It is malleable

It is heavy

It is ductile

Solution

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