Metals and Non-metals Test

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Metals and Non-metals Test - 29

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is not a property of ionic compounds?

A
They are solids.

B
They have low melting points.

C
They are good conductors in molten state.

D
They are soluble in water

Solution

Ionic compounds have high melting and boiling points. This is because a considerable amount of energy is required to break the strong inter-ionic attraction.
Hence, the correct option is $$B$$.
Question 2
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Which of the following can undergo a chemical reaction ?

A
$$MgSO_{4} + Fe$$

B
$$ZnSO_{4} + Fe$$

C
$$MgSO_{4} + Pb$$

D
$$CuSO_{4} + Fe$$

Solution

The Reactivity series is an arrangement of metals in the order of decreasing reactivities. We can infer that a more reactive metal displaces a less reactive metal from a solution of its salt.

$$K>Na>Ca>Mg> Al>Zn> Fe>Pb>H>Cu>Hg>Ag>Au$$

From the reactivity series, it is clear that $$Fe$$ is more reactive than $$Cu$$ and can replace $$Cu$$. But in the case of $$Mg$$ and $$Zn$$, we find that they are more reactive than $$Fe$$ and same in the case of $$Mg$$ and $$Pb$$ where $$Mg$$ is more reactive than $$Pb$$.

Hence, the reaction of $$CuSO_4$$ and $$Fe$$ is possible.
Question 3
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A metal $$M$$ does not liberate hydrogen from dilute hydrochloric acid but reacts with oxygen to give a black coloured product. Identify the black coloured product:

A
$$MgO$$

B
$$CuO$$

C
$$FeO$$

D
$$ZnO$$

Solution

The metal $$M$$ is copper $$(Cu)$$ which reacts with oxygen when heated in the air to form black coloured copper(ll) oxide. The reaction can be written as:
$$2Cu + O_{2} \rightarrow 2CuO$$
Copper is present below hydrogen in the reactivity series of metals. So, it does not react with dilute acids like hydrochloric acid or sulfuric acid.
Question 4
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Zinc granules give $$H_2$$ gas when treated with dilute solution of:

A
$$H_{2}SO_{4}$$

B
$$HCl$$

C
$$NaOH$$

D
all of these

Solution

i) Zinc reacts with dilute sulphuric acid($$H_{2}SO_{4}$$) to form zinc sulphate ($$ZnSO_{4}$$) and hydrogen($$H_{2}$$) gas.
$$ Zn(s) + H_{2}SO_{4}(aq) \rightarrow ZnSO_{4}(aq) + H_{2}(g)$$
ii) Zinc reacts with hydrochloric acid to form zinc chloride($$ ZnCl_{2}$$) and hydrogen($$ H_{2}$$) gas.
$$ Zn(s) + 2HCl(aq) \rightarrow ZnCl_{2}(aq) + H_{2}(g)$$
iii) Zinc reacts with sodium hydroxide to form sodium zincate($$Na_{2}ZnO_{2}$$) and hydrogen($$H_{2}$$).
$$Zn(s) + 2NaOH(aq) \rightarrow Na_{2}ZnO_{2}(aq) + H_{2}(g)$$
Question 5
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During electrolytic refining of zinc, pure zinc gets:

A
deposited at cathode

B
deposited at anode

C
deposited at cathode as well at anode

D
remains in the solution

Solution

In the electrolytic refining process, the impure metal is made the anode and a thin strip of pure metal is made the cathode.
A solution of the metal salt is used as an electrolyte.

On passing the current through the electrolyte, the pure metal from the anode dissolves into the electrolyte.

An equivalent amount of pure metal is deposited on the cathode.
Question 6
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$$Fe_{x}O_{3}(s) + 2Al(s) \rightarrow 2Fe(l) + Al_{2}O_{y}(s) + Heat$$
What are the values of $$x$$ and $$y$$?

A
$$ x = 2 , y = 3 $$

B
$$ x = 3 , y =2 $$

C
$$ x = 2 , y = 2 $$

D
$$ x = 3 , y = 3 $$

Solution

When aluminium replaces iron in a reaction, a lot of heat is evolved which is used to join railway tracks or cracked machine parts.
The reaction is called thermite reaction and can be balanced as:
$$Fe_{2}O_{3} + 2Al \rightarrow 2Fe + Al_{2}O_{3} + heat$$
Question 7
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A metal that exists as a liquid at room temperature is obtained by heating its sulphide in the presence of air. Identify the metal.

A
$$Hg$$

B
$$I$$

C
$$Cl$$

D
$$Br$$

Solution

Metals low in activity series can be obtained by reducing their sulphides or oxides by heating. Mercury is the only metal that exists as a liquid at room temperature. It can be obtained by heating cinnabar ($$HgS$$), the sulphide ore of mercury.
The reactions are as follows :

$$2HgS+3{ O }_{ 2 }\xrightarrow { heat } 2HgO+2S{ O }_{ 2 }\\ 2HgO\xrightarrow { heat } 2Hg+{ O }_{ 2 }$$

Option A is correct.
Question 8
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What happens when a piece of silver metal is added to the copper sulfate solution?

A
Silver sulfate is formed

B
Silver displaces copper sulfate

C
Oxygen gas is evolved

D
No reaction

Solution

The reactivity series follows the order:
$$Cu>Hg>Au>Ag$$

Thus, When silver $$(Ag)$$ metal is added to copper sulfate ($$CuSO_{4}$$) solution, no reaction takes place as silver is less reactive than copper so it can not displace copper from its solution.

$$Ag + CuSO_{4} \rightarrow $$ no reaction
Question 9
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A list of common metals arranged in order of their decreasing reactivity is known as:

A
activity series

B
reactivity series

C
conductivity series

D
both $$A$$ and $$B$$

Solution

An activity or reactivity series is a list of substances ranked in order of relative reactivity formed after displacement experiments. The most active metals are at the top of the table and least reactive at the bottom of the table.
Question 10
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Metals generally react with dilute acids to produce hydrogen gas. Which one of the following metals does not react with dilute hydrochloric acid?

A
Magnesium

B
Aluminium

C
Iron

D
Copper

Solution

In the case of copper, no bubbles are seen and the temperature also remains unchanged. This shows that copper does not react with dilute HCl.

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Re-Attempt Weekly Quiz Competition

Metals and Non-metals Test - 29

Result

Metals and Non-metals Test - 29

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Question 1

They are solids.

They have low melting points.

They are good conductors in molten state.

They are soluble in water

Solution

Question 2

$$MgSO_{4} + Fe$$

$$ZnSO_{4} + Fe$$

$$MgSO_{4} + Pb$$

$$CuSO_{4} + Fe$$

Solution

Question 3

$$MgO$$

$$CuO$$

$$FeO$$

$$ZnO$$

Solution

Question 4

$$H_{2}SO_{4}$$

$$HCl$$

$$NaOH$$

all of these

Solution

Question 5

deposited at cathode

deposited at anode

deposited at cathode as well at anode

remains in the solution

Solution

Question 6

$$ x = 2 , y = 3 $$

$$ x = 3 , y =2 $$

$$ x = 2 , y = 2 $$

$$ x = 3 , y = 3 $$

Solution

Question 7

$$Hg$$

$$I$$

$$Cl$$

$$Br$$

Solution

Question 8

Silver sulfate is formed

Silver displaces copper sulfate

Oxygen gas is evolved

No reaction

Solution

Question 9

activity series

reactivity series

conductivity series

both $$A$$ and $$B$$

Solution

Question 10

Magnesium

Aluminium

Iron

Copper

Solution

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