Materials Metals and Non Metals Test

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Materials Metals and Non Metals Test - 20

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Weekly Quiz Competition

Question 1
1 / -0

A non-metallic oxide dissolves in water to give :

A
alkali

B
acid

C
base

D
none of these

Solution

Non metallic oxide dissolves in water to form an acid.

$$CO_2+{ H }_{ 2 }O\rightarrow { H }_{ 2 }{ CO }_{ 3 }$$

Carbonic acid is an acid formed by reaction of water with oxide of carbon.
Question 2
1 / -0

Metals can be hammered into thin sheets. This property is called:

A
density

B
malleability

C
ductility

D
strength

Solution

The ability to be hammered, pressed, or rolled into thin sheets without breaking is called malleability. Metals are generally malleable.
Question 3
1 / -0

Which of the following statements is correct about the physical properties of metals and non-metals?

A
Both are sonorous.

B
Both are poor conductors of heat.

C
Most metals are hard and lustrous, while most non-metals are soft and dull.

D
Metals do not conduct electricity while non-metals do.

Solution

Metals are generally sonorous, and good conductors of heat and electricity. On the other hand, most non-metals are not sonorous and are bad conductors of heat and electricity.

Moreover, metals are generally hard and lustrous, and non-metals are soft and dull.

Examples of metals include iron, copper, aluminium. Examples of non-metals are carbon, oxygen, phosphorus.
Question 4
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A student takes Cu, Al, Fe and Zn strips separately in four test-tubes labelled as I, II, III and IV respectively. He adds 10 ml of freshly prepared ferrous sulphate solution to each test-tube and observes the colour of the metal in each case. He would observe a black residue in:

A
I and II

B
I and III

C
II and III

D
II and IV

Solution

The black residue will appear due to the formation of iron in tubes (II) and (IV) because of displacement reaction taking place and the reaction is given below

$$2Al(s) + 3FeSO_4(aq) \rightarrow Al_2(SO_4)_3(aq) + 3Fe(s)$$ (Black residue)

$$Zn(s) + FeSO_4(aq) \rightarrow ZnSO_4(aq) +Fe(s) $$ (Black residue)
Question 5
1 / -0

Acid reacts with metal to form:

A
salt + $$CO_2$$

B
salt + water

C
salt + $$O_2$$

D
salt + $$H_2$$

Solution

When an acid reacts with a metal, metal salt and hydrogen are formed. However, this depends if the metal is reactive or not.
For example- magnesium $(Mg)$$, is a reactive metal to hydrochloric acid. Therefore, making magnesium chloride and hydrogen:

$$Mg + 2HCl \longrightarrow MgCl_2 + H_2$$
Question 6
1 / -0

What type of oxides is formed when non-metals combine with oxygen?

A
Acidic oxides

B
Basic oxide

C
Neutral oxide

D
Both A and B

Solution

Explanation:
Non metals on combustion forms acidic oxides.

Example: $$S + {O_2} \to S{O_2}$$ where $$S{O_2}$$ is an acidic oxide.
$$C + O_2 \rightarrow CO_2$$ where $$CO_2$$ is an acidic oxide.
Metals on combustion form basic oxides.
Example: $$4 \ Na + O_2 \rightarrow Na_2O$$ where $$Na_2O$$ is a basic oxide.

Correct Option : $$A$$
Question 7
1 / -0

On strong heating, zinc metal burns in presence of air to form :

A
zinc chloride

B
zinc sulphide

C
zinc oxide

D
zinc hydroxide

Solution

Zinc metal burns in air only on strong heating to form zinc oxide.

$$Zinc + Oxygen \xrightarrow{\Delta} Zinc\,oxide$$

$$2Zn + O_2 \xrightarrow{\Delta} 2ZnO$$
Question 8
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Identify the amphoteric oxide.

A
Aluminium oxide

B
Iron oxide

C
Copper oxide

D
Magnesium oxide

Solution

Oxides that show acidic, as well as basic behaviour, are called amphoteric oxide. Aluminium oxide is an amphoteric oxide because it acts as acid as well as base and forms salt and water.

$$Al_2O_3\;\;+\;\;\;6HCl\;\;\;\rightarrow\;\;2AlCl_3\;\;+\;\;\;3H_2O\;\;\;$$ (Basic nature)

$$Al_2O_3\;\;\;+\;\;2NaOH\;\;\;\rightarrow\;\;2NaAlO_2\;\;+\;\;H_2O\;\;$$ (Acidic nature)

Oxides of iron, copper, and magnesium are not amphoteric. So the correct option is A
Question 9
1 / -0

Metal is

A
Good conductor of electricity.

B
Bad conductor of electricity.

C
A & B both

D
None of these

Solution

Correct Answer: Option A

Explanation: Metals have free electrons present in them so they are good conductors of electricity.
Question 10
1 / -0

What is the nature of the following reaction?
$$Cu + HCl \rightarrow$$

A
Reacts vigorously

B
No reaction

C
Reacts modestly

D
Reacts slowly

Solution

Hydrochloric acid ($$HCl$$) does not react with copper ($$Cu$$).
Only those metals which lie above hydrogen in the reactivity series react with acids like $$HCl$$ and dilute $$H_2SO_4$$ and displace hydrogen from them.

Copper lies below hydrogen in the reactivity series and does not react with hydrochloric acid.
So, the correct answer is $$B$$.

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Re-Attempt Weekly Quiz Competition

Materials Metals and Non Metals Test - 20

Result

Materials Metals and Non Metals Test - 20

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SHARING IS CARING

Question 1

alkali

acid

base

none of these

Solution

Question 2

density

malleability

ductility

strength

Solution

Question 3

Both are sonorous.

Both are poor conductors of heat.

Most metals are hard and lustrous, while most non-metals are soft and dull.

Metals do not conduct electricity while non-metals do.

Solution

Question 4

I and II

I and III

II and III

II and IV

Solution

Question 5

salt + $$CO_2$$

salt + water

salt + $$O_2$$

salt + $$H_2$$

Solution

Question 6

Acidic oxides

Basic oxide

Neutral oxide

Both A and B

Solution

Question 7

zinc chloride

zinc sulphide

zinc oxide

zinc hydroxide

Solution

Question 8

Aluminium oxide

Iron oxide

Copper oxide

Magnesium oxide

Solution

Question 9

Good conductor of electricity.

Bad conductor of electricity.

A & B both

None of these

Solution

Question 10

Reacts vigorously

No reaction

Reacts modestly

Reacts slowly

Solution

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