10th Grade > Chemistry
METALS AND NON-METALS MCQs
Total Questions : 57
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Answer: Option A. -> mercury
:
A
An ore consists ofdesired metal compoundfrom which the metal can be extracted profitably.
Cinnabar is an ore of mercury. Its chemical formula is HgS.
It is the most common source usedfor refining elemental mercury.
:
A
An ore consists ofdesired metal compoundfrom which the metal can be extracted profitably.
Cinnabar is an ore of mercury. Its chemical formula is HgS.
It is the most common source usedfor refining elemental mercury.
Answer: Option B. -> Low Melting Point
:
B
Metals exhibit the following physical properties-
- They are lustrous (shiny).
- They are sonorous (ringing sound).
- They have high melting and boiling points.
- They are hard.
- They are malleable and ductile.
- They are good conductors of heat and electricity.
:
B
Metals exhibit the following physical properties-
- They are lustrous (shiny).
- They are sonorous (ringing sound).
- They have high melting and boiling points.
- They are hard.
- They are malleable and ductile.
- They are good conductors of heat and electricity.
Answer: Option C. -> coating zinc
:
C
Galvanisation is the method of applying a protective layer on metal to prevent the metal from corrosion.
A coating of zinc is applied on iron or steel during galvanization. It prevents iron from coming in direct contact with air and water. Thus, preventing it from rusting.
:
C
Galvanisation is the method of applying a protective layer on metal to prevent the metal from corrosion.
A coating of zinc is applied on iron or steel during galvanization. It prevents iron from coming in direct contact with air and water. Thus, preventing it from rusting.
Answer: Option D. -> Lithium
:
D
Metals are usually very hard but alkali metals (lithium, sodium, potassium) are so soft that they can be cut with a knife. This is because they have very low densities.
:
D
Metals are usually very hard but alkali metals (lithium, sodium, potassium) are so soft that they can be cut with a knife. This is because they have very low densities.
Answer: Option B. -> Copper glance
:
B
Copper Glance ( Cu2S) is a sulphide ore of copper. Rest are oxide ores of copper.
:
B
Copper Glance ( Cu2S) is a sulphide ore of copper. Rest are oxide ores of copper.
Answer: Option B. -> Magnetic separation
:
B
:
B
- Magnetic separation method is used for concentrating ores that contain impurites that have magnetic properties.
- Froath floatation process is used to concentrate sulphide ores.
- Leaching is a process used to concentrate ores that can be dissolved in a chemical solvent.
- Roasting is the process of converting a sulphide ore to an oxide ore by heating it in the presence of oxygen at higher temperatures. This is generally done after concentation of the ore.
Answer: Option D. -> Both statements are true. Also, Statement 2 is the correct reason for statement 1.
:
D
Ionic compounds are made up of positive and negative ions which have strong electrostatic force of attraction among them. So, a lot of heat energy is required to break this force of attraction due to which ionic compounds have high melting point.
:
D
Ionic compounds are made up of positive and negative ions which have strong electrostatic force of attraction among them. So, a lot of heat energy is required to break this force of attraction due to which ionic compounds have high melting point.
Answer: Option B. -> Li and Cl have valency 1 and 1 respectively
:
B
Valency of an atom is the number of electrons it is willing to give up oraccept in order to achieve electronic configuration of nearest stable noble gas.
Here, if lithium gives up one electron, it achieves the configuration of helium which is stable. So the valency of lithium is 1.
Similarly, chlorine accepts 1 electron to achieve the configuration of argon. So the valency of chlorine is 1.
:
B
Valency of an atom is the number of electrons it is willing to give up oraccept in order to achieve electronic configuration of nearest stable noble gas.
Here, if lithium gives up one electron, it achieves the configuration of helium which is stable. So the valency of lithium is 1.
Similarly, chlorine accepts 1 electron to achieve the configuration of argon. So the valency of chlorine is 1.
Answer: Option D. -> All of the given options
:
D
Rusting of iron can be prevented by painting, oiling, greasing, galvanizing, chrome plating, anodizing or making alloys.
Through galvanisation, painting and chrome plating, the surface of the metal is no longer exposed to the atmosphere, and thus, corrosion is prevented.
:
D
Rusting of iron can be prevented by painting, oiling, greasing, galvanizing, chrome plating, anodizing or making alloys.
Through galvanisation, painting and chrome plating, the surface of the metal is no longer exposed to the atmosphere, and thus, corrosion is prevented.
Answer: Option C. -> bromine
:
C
Bromine is a halogen which is found in liquid state at room temperature and pressure. Oxygen and nitrogen are found in gaseous state at room temperature. Whereasiodine is found in solid state at room temperature.
:
C
Bromine is a halogen which is found in liquid state at room temperature and pressure. Oxygen and nitrogen are found in gaseous state at room temperature. Whereasiodine is found in solid state at room temperature.
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