Metals and Non-metals Test

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Metals and Non-metals Test - 37

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Weekly Quiz Competition

Question 1
1 / -0

An element has a dull appearance, low density, and low melting point. It could be a ________.

A
metal

B
non-metal

C
both of the above

D
none of the above

Solution

Non-metals are usually elements that have low density, a dull appearance, and a low melting point.
Question 2
1 / -0

Magnesium can be extracted from its ore by:

A
reacting with $$CO$$

B
reacting with sulphide

C
electrolysis

D
all of above

Solution

Magnesium metal is high up in the reactivity series, is very reactive, and cannot be obtained from its compounds by heating with carbon. This is because it has more affinity for oxygen than carbon. Thus, it is obtained by electrolytic reduction.
Question 3
1 / -0

The metals sodium, calcium, and magnesium at the top of the reactivity series can be obtained by:

A
reduction of their oxides

B
oxidation

C
electrolysis of their molten chlorides

D
heating

Solution

The metals high up in the activity series are very reactive. They cannot be obtained by heating their compounds with carbon. Reduction of their oxides by carbon is not possible because these metals have a high affinity for oxygen than carbon.
Sodium, calcium, and magnesium metals are obtained by the electrolysis of their molten chlorides, e.g., extraction of $$Na$$ from $$NaCl$$.
Option $$C$$ is correct.
Question 4
1 / -0

Conversion of ferric oxide to iron metal using aluminium is called as:

A
enrichment process

B
hematite reduction

C
thermite reaction

D
none of above

Solution

Ferric oxide, when heated with aluminium, it is reduced to iron metal. In this reaction, a lot of heat is produced. This reaction is also known as a thermite reaction. A thermite reaction is used in the welding electric conductors, iron joints, etc. such as joints in railway tracks.
$$ Fe_2O_3 + 2Al \rightarrow 2Fe + Al_2O_3 + \ heat $$
Hence, option $$C$$ is correct.
Question 5
1 / -0

Which of the following reactions will occur, according to the activity series?
1. $$Fe+Al_2O_3 \rightarrow$$
2. $$Cu+MgCl_2 \rightarrow$$
3. $$Cu +AlCl_3 \rightarrow$$
4. $$Fe + HCl \rightarrow$$

A
$$1 \ $$and$$ \ 2$$

B
Only $$4$$

C
Only $$1$$

D
$$1, 3 \ $$and$$ \ 4$$

Solution

The activity/reactivity series is a list of metals arranged in the order of their decreasing activities. Metals higher in the series displace the metals that come below them in the activity series. $$Fe$$ and $$Cu$$ cannot displace $$Al$$ or $$Mg$$ as they fall below the given metals in the reactivity series. However, since $$Fe$$ is above hydrogen in the series, it can displace $$H$$ from the reaction 4.

$$Fe + 2 HCl \rightarrow FeCl_2 + H_2$$
Question 6
1 / -0

Which of the following methods is suitable for preventing an iron frying pan from rusting?

A
Applying grease

B
Applying paint

C
Applying a coating of zinc

D
All of the above

Solution

Applying paint and grease are not suitable solutions to prevent an iron frying pan from rusting as the paint can melt by flame and can be destroyed in repeated use.
Applying a coating of zinc is a better option as it forms a coating of corrosion-resistant zinc which prevents corrosive substances from reaching the more delicate part of the metal.
Question 7
1 / -0

In the reaction between $$Al$$ and $$Fe_2O_3$$, what is the correct final reaction?

A
$$Al+Fe_2O_3 \rightarrow Al_3O_2+2Fe$$

B
$$2Al+Fe_2O_3 \rightarrow Al_2O_3+2Fe$$

C
$$Al+Fe_2O_3 \rightarrow Al_2O_3+Fe_2$$

D
$$Al+Fe_2O_3 \rightarrow Al_2O_3+2Fe$$

Solution

Al will displace iron from solution as it is more reactive than iron according to the reactivity series
$$\displaystyle 2Al+Fe_2O_3 \rightarrow Al_2O_3+2Fe$$
Question 8
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 has low melting point

D
It is ductile

Solution

Aluminium is a metal and shows the properties of metals, i.e, malleability, ductility and conductivity of heat and electricity. It has, however, like most metals, has a high melting point.
Question 9
1 / -0

Non-metals are poor conductors of heat and tend to:

A
Be brittle

B
Conduct an electrical current

C
Have a shiny luster

D
Be malleable

E
Be sonorous

Solution

Non-metals are poor conductors of heat and electricity. They are non-lustrous, non-sonorous and are brittle and non-malleable.
Question 10
1 / -0

When $$Fe_2O_3$$ is heated with aluminium powder, the products obtained are _______ .

A
$$Fe$$, $$Al_2O_3$$ and heat.

B
$$Fe$$ and $$Al_2O_3$$

C
$$FeO$$, $$Al_2O_3$$ and heat.

D
$$FeO$$ and $$Al_2O_3$$

Solution

When $$Fe_2O_3$$ is heated with aluminium powder, the products obtained are $$Fe$$, $$Al_2O_3$$ and $$heat$$.
$$\displaystyle Fe_2O_3 + 2Al \rightarrow 2 Fe +Al_2O_3 + $$ $$heat$$

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Re-Attempt Weekly Quiz Competition

Metals and Non-metals Test - 37

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Metals and Non-metals Test - 37

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Question 1

metal

non-metal

both of the above

none of the above

Solution

Question 2

reacting with $$CO$$

reacting with sulphide

electrolysis

all of above

Solution

Question 3

reduction of their oxides

oxidation

electrolysis of their molten chlorides

heating

Solution

Question 4

enrichment process

hematite reduction

thermite reaction

none of above

Solution

Question 5

$$1 \ $$and$$ \ 2$$

Only $$4$$

Only $$1$$

$$1, 3 \ $$and$$ \ 4$$

Solution

Question 6

Applying grease

Applying paint

Applying a coating of zinc

All of the above

Solution

Question 7

$$Al+Fe_2O_3 \rightarrow Al_3O_2+2Fe$$

$$2Al+Fe_2O_3 \rightarrow Al_2O_3+2Fe$$

$$Al+Fe_2O_3 \rightarrow Al_2O_3+Fe_2$$

$$Al+Fe_2O_3 \rightarrow Al_2O_3+2Fe$$

Solution

Question 8

Good conductor of heat and electricity

It is malleable

It has low melting point

It is ductile

Solution

Question 9

Be brittle

Conduct an electrical current

Have a shiny luster

Be malleable

Be sonorous

Solution

Question 10

$$Fe$$, $$Al_2O_3$$ and heat.

$$Fe$$ and $$Al_2O_3$$

$$FeO$$, $$Al_2O_3$$ and heat.

$$FeO$$ and $$Al_2O_3$$

Solution

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