Metals and Non-metals Test

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Metals and Non-metals Test - 28

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Weekly Quiz Competition

Question 1
1 / -0

During the formation of ionic bond ________transfer takes place from one atom to the others.

A
electron

B
proton

C
neutron

D
None of these

Solution

The compounds formed by the transfer of electrons from a metal to a non-metal are known as ionic compounds or electrovalent compounds.
Thus, option $A$ is correct.
Question 2
1 / -0

Generally, pure metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals (except $Mn$ and $Mg$ )?

A
$H_{2}SO_{4}$

B
$HCl$

C
$HNO_{3}$

D
All of the above

Solution

Some of the metals react with dilute acid, forming metal salt and hydrogen, while a few do not react with dilute acids.
Hydrogen gas is not evolved when a metal reacts with nitric acid. It is because $HNO_3$ is a strong oxidising agent. It oxidises the $H_2$ produced to water and itself gets reduced to any of the nitrogen oxides ( $N_2O$ , $NO$ , $NO_2$ ).
Question 3
1 / -0

What happens when calcium is treated with water?
(i) It does not react with water
(ii) It reacts violently with water
(iii) It reacts less violently with water
(iv) Bubbles of hydrogen gas formed stick to the surface of calcium

A
(i) and (iv)

B
(ii) and (iii)

C
(i) and (ii)

D
(iii) and (iv)

Solution

In general, metals form a metal oxide and hydrogen gas and this metal oxide when soluble in water dissolve further forming a metal hydroxide. But some metals form metal hydroxide directly.
In the case of calcium, the reaction with water is less violent and hydrogen starts floating on water and bubbles of hydrogen gas will stick to the metal surface.
$Ca + 2H_2O \rightarrow Ca(OH)_2+ H_2$
Question 4
1 / -0

Which of the following pairs of substances, on reaction, will not evolve $H_{2}$ gas?

A
Iron and $H_{2} SO_{4} (aq)$

B
Iron and steam

C
Copper and $HCl (g)$

D
Sodium and $HCl (aq)$

Solution

As per the reactivity series, Copper falls below Hydrogen which means its reactivity is lower than that of hydrogen, so it cannot displace hydrogen from hydrochloric acid.
Question 5
1 / -0

Prevention of corrosion of iron by $Zn$ coating is called:

A
galvanization

B
alloying

C
electrolysis

D
soldering

Solution

Galvanization is the process of applying a protective zinc coating to steel or iron. It prevents iron or steel from corrosion.

Thus, the correct option is $A$ .
Question 6
1 / -0

Which of the following metals are refined by electrolytic refining?

(i) $Au$
(ii) $Cu$
(iii) $Na$
(iv) $K$

A
(i) and (ii)

B
(i) and (iii)

C
(ii) and (iii)

D
(iii) and (iv)

Solution

The metals produced by various reduction processes are not very pure. They contain impurities, which must be removed to obtain pure metals. The most widely used method for refining impure metals is electrolytic refining. Many metals, such as copper and silver are refined electrolytically.

Hence the correct option is A.
Question 7
1 / -0

The state in which $NaCl$ is a bad conductor of electricity is _________ and the state in which $NaCl$ is a good conductor of electricity is __________.

A
solid, vapour

B
vapour, molten

C
molten, solid

D
solid, molten

Solution

$NaCl$ is a bad conductor of electricity in the solid state as there are no free ions.
In the molten state, the ions are free to move around and therefore, can conduct electricity.

Hence, option $D$ is correct.
Question 8
1 / -0

In an ionic compound, cations and anions are held together by:

A
gravitational forces

B
electrostatic forces

C
magnetic forces

D
frictional forces

Solution

Ionic compounds are solids held by the strong forces of attraction called electrostatic forces between the positive and negative ions (i.e, cations and anions). Thus, option $B$ is correct.
Question 9
1 / -0

Which of the following conducts electricity?

A
Crystalline NaCl

B
Molten NaCl

C
Molten sulphur

D
Diamond

Solution

Ionic compounds in the solid state do not conduct electricity because movement of ions in the solid is not possible due to their rigid structure. But ionic compounds conduct electricity in the molten state. This is possible in the molten state since the elecrostatic forces of attraction between the oppositely charged ions are overcome due to the heat. Thus, the ions move freely and conduct electricity. Molten sulphur and diamond don't conduct electricity as they are non-metals.
Hence, correct option is $B$
Question 10
1 / -0

Which one of the following four metals would be displaced from the solution of its salts by other three metals?

A
$Mg$

B
$Ag$

C
$Zn$

D
$Cu$

Solution

In a displacement reaction, a more reactive metal of the activity series can displace a less reactive one in its salt solution.

Reactivity order is:
$Mg> Zn> Cu> Ag.$

Thus, we see that Ag is least reactive and of the given four metals, Ag would be displaced from the solution of its salts by the other three metals.

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Metals and Non-metals Test - 28

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Metals and Non-metals Test - 28

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Question 1

electron

proton

neutron

None of these

Solution

Question 2

H2SO4H_{2}SO_{4}H2​SO4​

HClHClHCl

HNO3HNO_{3}HNO3​

All of the above

Solution

Question 3

(i) and (iv)

(ii) and (iii)

(i) and (ii)

(iii) and (iv)

Solution

Question 4

Iron and H2SO4(aq)H_{2} SO_{4} (aq)H2​SO4​(aq)

Iron and steam

Copper and HCl(g)HCl (g)HCl(g)

Sodium and HCl(aq)HCl (aq)HCl(aq)

Solution

Question 5

galvanization

alloying

electrolysis

soldering

Solution

Question 6

(i) and (ii)

(i) and (iii)

(ii) and (iii)

(iii) and (iv)

Solution

Question 7

solid, vapour

vapour, molten

molten, solid

solid, molten

Solution

Question 8

gravitational forces

electrostatic forces

magnetic forces

frictional forces

Solution

Question 9

Crystalline NaCl

Molten NaCl

Molten sulphur

Diamond

Solution

Question 10

MgMgMg

AgAgAg

ZnZnZn

CuCuCu

Solution

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$H_{2}SO_{4}$

$HCl$

$HNO_{3}$

Iron and $H_{2} SO_{4} (aq)$

Copper and $HCl (g)$

Sodium and $HCl (aq)$

$Mg$

$Ag$

$Zn$

$Cu$