Question

B. SHORT ANSWER TYPE QUESTIONS
1. Why is iron used in the construction of buildings, bridges, railway lines etc.?
2. Magnesium and copper metals are heated directly over a flame. Which of the two will burn in the air
3. Write the equation for the reaction which takes place when sodium oxide reacts with water. How with
this solution behave towards red litmus paper
4. Do non-metals also undergo displacement reaction? Give an example.
?
F.
C. LONG ANSWER TYPE QUESTIONS
1. Differentiate between metals and non-metals.
2. What is a displacement reaction? What happens when aluminium is dipped in copper sulphate
solution ?
3. How do non-metals react with oxygen ? What is the nature of their oxides?
4. List some industrial uses of metals and non-metals.
5. Give reason for the following:
(a) Metals are used to make strings of musical instruments.
(b) Copper bottomed utensils are used for cooking.
(c) Sodium is kept in kerosene while phosphorous is kept in water.
D. CHOOSE THE CORRECT ANSWER
1. The property of metals to be drawn into thin wires is called
(a) ductility
(b) malleability
(c) conductivity
(d) sonority
2. A non-metal also a conductor of electricity is
(a) nitrogen
(b) oxygen
(c) graphite
(d) phosphorous
(b) basic
(d) neutral
3. The nature of metallic oxides is
(a) acidic
(c) amphoteric
4. Iron reacts with oxygen to form
(a) ferrous oxide
(c) ferroso-ferric oxide
(b) ferric oxide
(d) ferrous chloride​

Answer 1

Answer:

Why is iron used in the construction of buildings, bridges, railway lines etc.?

Because the tensile strength of Iron is far greater than any other material which can be used as a Building material.

Magnesium and copper metals are heated directly over a flame. Which of the two will burn in the air?

Magnesium is a very reactive metal as compared to copper . It reacts very easily to the mild temperatures and reacts with oxygen instantly. Therefore, when copper and magnesium are heated together, magnesium being more sensitive to change, reacted with air and burn with a lush bright flame. This is also the reason that magnesium strips were used in world war.

Write the equation for the reaction which takes place when sodium oxide reacts with water. How with

Write the equation for the reaction which takes place when sodium oxide reacts with water. How withthis solution behave towards red litmus paper?

Na2O + H20 - 2NaOH(aq)

Sodium oxide in water gives sodium hydroxide solution. It is alkaline and turns phenolphthalein solution pink and red litmus paper to blue.

Do non-metals also undergo displacement reaction? Give an example.

Not only metals but also non-metals can take part in displacement reactions depending upon their order of reactivity. For example chlorine can displace bromine from the non-metal salt solution like metal because it is more reactive than bromine.

Differentiate between metals and non-metals.

• Metals are the elements which exhibit the highest degree of metallic behaviour is known as metals, on the contrary Nonmetals are such elements which do not possess any metallic behaviour,
• Metals are placed on the left side of the periodic table, and Nonmetals are placed on the right side of the periodic table
• Metals are located in s, p, d, and f blocks in the periodic table, though nonmetals are located in s and p blocks
• Metals have a shiny appearance, and nonmetals have a dull appearance;
• Thermal and electrical conductivity is high in metals, low in nonmetals,
• Metals have low electronegativity as compare to nonmetals,
• Metals show ductility and malleability, but nonmetals do not display this property.

List some industrial uses of metals and non-metals.

Uses of Metals are: Chosen for their durability, strength and resistance to weather, metals used in the construction industry serve a wide range of functions. The most common of them are carbon steel, aluminum, copper tubing and stainless steel, which each have their particular qualities and ideal uses.

Uses of Non-metals are: Non-metallic compounds, such as cement and glass have innumerable uses in modern civilization. Hydrogen is used in the hydrogenation of vegetable oils to make vegetable ghee. It is used in the manufacture of ammonia. Liquid hydrogen is used as a rocket fuel.

What is a displacement reaction? What happens when aluminium is dipped in copper sulphate

What is a displacement reaction? What happens when aluminium is dipped in copper sulphatesolution?

displacement reaction is a reaction in which a more reactive metal or non-metal displaces a less reactive metal or non-metal from its salt solution.

when aluminium is dripped in coppet sulphate solution aluminium being more reactive than copper displaces it from its salt solution. the reaction involved is:-

2Al+3cuso4=Al2(So4)3 +3 cu.

How do non-metals react with oxygen ? What is the nature of their oxides?

Non-metals react with oxygen to form non-metal oxides. Non-metal oxides are acidic in nature. They turn blue litmus to red. Sulphurous acid turns blue litmus to red showing it is an acid and that sulphur dioxide is acidic in nature.

Give reason for the following:

Give reason for the following:(a) Metals are used to make strings of musical instruments.

Give reason for the following:(a) Metals are used to make strings of musical instruments.(b) Copper bottomed utensils are used for cooking.

Give reason for the following:(a) Metals are used to make strings of musical instruments.(b) Copper bottomed utensils are used for cooking.(c) Sodium is kept in kerosene while phosphorous is kept in water.

a) These are bcoz metals are good in making sounds, that means they have the property of sonorous, which allows them to produce good quality sound.

b) Copper bottomed vessels are used for cooking because of copper' s excellent heat conductivity. Copper conducts five time heat better than iron and twenty times better than stainless steal.

c) Sodium is kept in water while phosphorous is kept in water because sodium and potassium react with oxygen and get fire easily so they immersed it to avoid burn.

CHOOSE THE CORRECT ANSWER

1. The property of metals to be drawn into thin wires is called ductility
2. A non-metal also a conductor of electricity is graphite
3. The nature of metallic oxides is acidic
4. Iron reacts with oxygen to form ferric oxide