Metals and Their Properties

Q.

What is a free electron called?

Q.

Explain electrical conductivity of metals. [3 MARKS]

Q. Which property of aluminium is used in the making of aluminium foils?

1. Malleability
2. Ductility
3. Lustre
4. Conductivity

Q. Why are metals good conductors of electricity?

1. Their electrons are held very tightly
2. Their protons are held very loosely
3. Their neutrons are held very tightly
4. Their protons are held very tightly
5. Their electrons are held very loosely

Q.

Why zinc is a soft metal?

Q.

Name two most ductile metals.

Q.

Non-metals react by :

1. only by sharing electron.

2. accepting or sharing electron.

3. donating electron.

4. only by accepting electron.

Q.

Why are metals electropositive in nature?

Q.

Which of the following is not a property of metals?

1. Lustre
2. Low Boiling Point
3. High Boiling Point
4. Good conductors of heat

Q.

Which particles constitute current in a metallic conductor?

Q. Boiling point and melting point of a substance is 150 ${}^o$C and 50 ${}^o$C respectively. The temperature at which the substance undergoes freezing and condensation is X and Y respectively. Then:

1. X < 150 ${}^o$C
   Y < 50 ${}^o$C
2. X > 150 ${}^o$C
   Y > 50 ${}^o$C
3. X = 150 ${}^o$C
   Y = 50 ${}^o$C
4. X = 50 ${}^o$C
   Y = 150 ${}^o$C

Q.

Define the following term :

Ductility

Q. White phosphorus is a highly reactive molecular solid that melts just above room temperature (melting point = 30 degree Celsius). It subtly glows in the dark emitting light and this phenomenon is called chemiluminescence - True or False?

1. True
2. False

Q. Copper and aluminium are used for making electric wires/cables because :

1. they are malleable.
2. they are ductile.
3. they are good conductor of electricity.
4. they are lustrous.

Q. Which of the following are damaged by the process of corrosion?

1. Vehicles
2. Iron railings
3. Bridges
4. Plastic bottles

Q. Among the given options, identify the chemical elements that play an important role in electronic industries.

1. Silicon
2. Germanium
3. Hydrogen
4. Oxygen

Q. Name the metallic property due to which metal bells work

1. Ductility
2. Malleability
3. Conductivity
4. Sonority

Q. Please explain what is gallium?

Q. Discuss the properties due to which metals can be drawn into thin sheets and wires. [2 Mark]

Q. Metal which is the best conductor of electricity :

1. Gold
2. Silver
3. Nickel
4. Sodium

Q.

Metals conduct electricity because they contain free electrons

1. True
2. False

Q. Tungsten is used in electric bulbs because:

1. it is sonorous
2. It is metallic
3. it has high tensile strength
4. it has high density

Q.

Silver is a good conductor of electricity

1. True
2. False

Q. Why metals conducts electricity?

1. Due to the presence of free electrons.
2. Due to the presence of protons.
3. Due to the presence of cations.
4. All of the above.

Q. Silver is the best conductor of heat and electricity.

1. True
2. False

Q.

Metals that melt in hand are:

1. Cesium and Gallium

2. Iron and Copper

3. Francium and Uranium

4. Thorium and Radium

Q. Statement I: Metals have higher electronegativity values than non-metals.
Statement II: Metals conduct electric current.

1. Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1
2. Statement 1 is correct but Statement 2 is not correct
3. Both the Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1
4. Both the Statement 1 and Statement 2 are not correct
5. Statement 1 is not correct but Statement 2 is correct

Q. Explain metals conduct electricity.

Q.

E. Define the terms

3. malleability

Q.

2) Study Questions

(f) Name a metal which is poor conductor of electricity.