Materials Metals and Non Metals Test

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Materials Metals and Non Metals Test - 29

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Weekly Quiz Competition

Question 1
1 / -0

Generally, metals are solid. Which one of the following metals is found in a liquid state at room temperature?

A
$$Na$$

B
$$Fe$$

C
$$Cr$$

D
$$Hg$$

Solution

Hint: There are some exceptions in the properties of metals like they exist in the liquid state at room temperature.

Step 1: Generally, metals have high melting and boiling point due to strong metallic bonding. Metals mostly exist in solid state at room temperature because of the high melting point. Metals like sodium, iron, chromium, etc. exist in the solid state at room temperature.

Step 2: Mercury is a metal that exists in the liquid state at room temperature. It is because of the weaker metallic bond compared to other metals that mercury exists in the liquid state. The electrons in the mercury metal are tightly bonded by the nucleus so the metallic bond is weak.

Final step: So, the correct option is (D) $$Hg.$$
Question 2
1 / -0

What is formed by reaction of non-metal oxide with water?

A
Acid

B
Base

C
Salt

D
Metal

Solution

An acid is formed by reaction of non-metallic oxide with water.

Example:
$$\underset{\text{Non-metallic oxide}}{SO_{3} (g)} + \underset{\text{Water}}{H_{2}O (l)}\rightarrow \underset{\text{Acid}}{H_{2}SO_{4} (aq)}$$
Question 3
1 / -0

Which gas is produced by reaction of base with metal?

A
Carbon dioxide

B
Dioxygen

C
Dihydrogen

D
Dinitrogen

Solution

A strong base reacts with some metals to form salt and releases dihydrogen gas.
Question 4
1 / -0

Which of the following is a good conductor of heat?

A
Water

B
Kerosene

C
Iron

D
Air

Solution

Among the given options, iron is a metal. Metals generally are good conductors of heat. Water, kerosene and air are not metals. Also, they are not good conductors of heat.
Question 5
1 / -0

An element that conducts heat energy well and is easily shaped is a

A
metal

B
plastic

C
non-metal

D
None of the above

Solution

Metals are generally good conductors of heat, and are malleable and ductile (can be easily shaped). Plastic is a non-metal. Non-metals are generally bad conductors of heat.
Question 6
1 / -0

Metals react with water to form :

A
oxides

B
hydroxides

C
Both of them

D
None of these

Solution

When metal react with water, they form respective oxide and hydroxides.
$$\text{Example: }$$ $$2Na + 2H_2O \rightarrow 2NaOH + H_2 \uparrow $$
$$\quad \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ Mg + H_2O \rightarrow MgO + H_2 \uparrow $$
Question 7
1 / -0

Among non-metals, .......... is a ........... conductor of electricity.

A
chlorine, good

B
graphite, good

C
sulphur, good

D
oxygen, good

E
None of these
Solution
- Generally, non-metals are bad conductors of electricity. Chlorine, sulphur and oxygen are bad conductors.
- However, graphite is one of the few exceptions among non-metals that are good conductors of electricity.
Question 8
1 / -0

The reaction of aluminum atoms displacing hydrogen ions from sulphuric acid can be represented as:

A
$$2Al+3H_2SO_4\rightarrow Al_2(SO_4)_3+3H_2$$

B
$$Al+3H_2SO_4\rightarrow Al_2(SO_4)_3+H_2$$

C
$$3Al+2H_2SO_4\rightarrow Al_3(SO_4)_2+2H_2$$

D
$$2Al+6H_2SO_4\rightarrow Al_2(SO_4)_6+6H_2$$

Solution

The reaction of aluminium atoms displacing hydrogen ions from sulphuric acid can be represented as :
$$2Al+3H_2SO_4\rightarrow Al_2(SO_4)_3+3H_2$$
This is the balanced chemical equation.
The products of the reaction are aluminium sulphate and hydrogen.
Question 9
1 / -0

When sodium hydroxide reacts with aluminium metal:

A
sodium aluminate and water gas are formed

B
sodium aluminate and hydrogen gas are formed.

C
no reaction

D
can't say

Solution

Sodium aluminate and hydrogen gas are formed when sodium hydroxide reacts with aluminium metal.
$$2NaOH +2Al +2H_2O \rightarrow 2NaAlO_2 +2H_2$$
Option B is correct.
Question 10
1 / -0

Silver jewellery tarnish in the presence of moisture and:

A
Sulphur compounds

B
Nitrogen

C
Oxygen

D
Carbon dioxide

Solution

Tarnish of Silver jewellery is result of chemical reaction of Silver with Sulphur containing substances in the air forming Silver sulphide which is black in colour.

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Materials Metals and Non Metals Test - 29

Result

Materials Metals and Non Metals Test - 29

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Question 1

$$Na$$

$$Fe$$

$$Cr$$

$$Hg$$

Solution

Question 2

Acid

Base

Salt

Metal

Solution

Question 3

Carbon dioxide

Dioxygen

Dihydrogen

Dinitrogen

Solution

Question 4

Water

Kerosene

Iron

Air

Solution

Question 5

metal

plastic

non-metal

None of the above

Solution

Question 6

oxides

hydroxides

Both of them

None of these

Solution

Question 7

chlorine, good

graphite, good

sulphur, good

oxygen, good

None of these

Solution

Question 8

$$2Al+3H_2SO_4\rightarrow Al_2(SO_4)_3+3H_2$$

$$Al+3H_2SO_4\rightarrow Al_2(SO_4)_3+H_2$$

$$3Al+2H_2SO_4\rightarrow Al_3(SO_4)_2+2H_2$$

$$2Al+6H_2SO_4\rightarrow Al_2(SO_4)_6+6H_2$$

Solution

Question 9

sodium aluminate and water gas are formed

sodium aluminate and hydrogen gas are formed.

no reaction

can't say

Solution

Question 10

Sulphur compounds

Nitrogen

Oxygen

Carbon dioxide

Solution

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