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CBSE Questions for Class 8 Chemistry Materials Metals And Non Metals Quiz 1 - MCQExams.com
CBSE
Class 8 Chemistry
Materials Metals And Non Metals
Quiz 1
The property of metals by virtue of which they can be drawn into wires is called ductility.
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True
0%
False
Explanation
The property of metals to be drawn into thin wires is called ductility. Zinc and Mercury are the only metals that are not ductile, while Gold is a metal with large ductility.
The substance that will be flattened on beating with a hammer is:
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crystal of iodine
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lump of sulphur
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piece of coal
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zinc granule
Explanation
Iodine, sulfur, coal etc. are non-metals that are non-malleable.
Whereas zinc being a metal is malleable and hence, zinc granules can be flattened when beaten with a hammer.
Hence, the correct option is D.
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
The allotropic form of a non-metal, which is a good conductor of electricity is:
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Graphite
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Diamond
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Rhombic sulphur
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None of these
Explanation
Graphite, which is an allotrope of carbon, is a good conductor of electricity due to presence of free electrons.
Which liquid metal is used for making thermometers?
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Mercury
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Bromine
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Iodine
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Cadmium
Explanation
Mercury is used in many thermometers.
Since Liquids have a definite volume but indefinite shape, it is convenient to use a liquid to make a thermometer since the liquid will expand/contract based on heating and you can measure the temperature with just a ruler. Mercury is a liquid for a large temperature range around room temperature, so it is convenient.
Non-metal which is essential for our life and all living beings inhale it during breathing is :
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oxygen
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nitrogen
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hydrogen
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water
Explanation
An essential non metal used in breathing by all living being is 'oxygen'.
The ability of metals to be drawn into thin wires is known as:
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ductility
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malleability
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sonority
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conductivity
Explanation
The ability of metals to be drawn into thin wires is known as
ductility.
Option A is correct.
Non-metal which is used to sterilize water is :
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iodine
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bromine
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chlorine
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sulphur
Explanation
Chlorine is a non-metal which is used to disinfect water.
Chlorine can be applied for the deactivation of most microorganisms like bacteria.
Hence the correct option is C.
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Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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Assertion is correct but Reason is incorrect
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Both Assertion and Reason are incorrect
Explanation
Bells made of metals because metals are sonorous. When bells are hit they vibrate and produce sound. For this reason, metals are used to make musical instruments, and wood is rarely used.
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion. Hence A is the correct option.
Metals are generally hard. But which of the following metal is an exception that it can be cut with a knife?
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Iron
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Sodium
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Gold
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Magnesium
Explanation
Metals, in general, are hard solids at room temperature. Sodium, Potassium and Lithium are exceptional metals as they are soft.
Sodium is stored in kerosene and is so soft that it can be cut with a knife.
Hence the correct option is B.
A purple coloured non-metal forms a brown solution in alcohol which is applied on wounds as an antiseptic. The non-metal is :
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iodine
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bromine
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chlorine
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sulphur
Explanation
Iodine is a natural dark violet, a non-metallic element that plays a key role in human metabolism. Iodine, for example, is slightly soluble in water and gives a yellowish-brown solution. Brown solutions are also formed with alcohol.
Iodine is usually used in an alcohol
solution (called tincture of iodine) or as Lugol's iodine solution as a pre-and post-operative antiseptic. Some people do not recommend disinfecting minor wounds with iodine because of the concern that it may induce scar tissue formation and increase healing time.
Which non-metal has a shining surface?
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Graphite
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Phosphorous
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Sulphur
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None of the above
Explanation
Graphite is a non-metal that has exceptional lustrous property.
Option A is correct.
Non-metals have many different colours.
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True
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False
Explanation
Non-metals like phosphorous exist in various colours such as white, scarlet, yellow, red, violet, black. Similarly, sulphur is pale yellow, bromine is red-brown coloured in liquid and vapour state.
Thus option $$A$$ is correct.
Articles made of metals produce ringing sound when struck hard.
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True
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False
Explanation
Sonority is the property of metals and produces characteristic sound when struck. All metals are highly sonorous and the degree of sonority varies from metal to metal.
All metals are solids.
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True
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False
Explanation
The given statement is false as mercury, gallium and caesium are liquids at room temperature.
The property of metals by virtue of which, they produce sound when struck is called :
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sonority
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permeability
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ductility
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malleability
Explanation
Sonority (of a material) is the property of producing a ringing sound when struck. Most metals are sonorous. Therefore, they are used in many instruments (eg. cymbals and bells). Almost all non-metals are non-sonorous, i.e. they don't produce a ringing sound when struck.
Hence, the correct option is $$\text{A}$$
Which of the following is a lustrous non-metal?
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Chlorine
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Nitrogen
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Iodine
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Fluorine
Explanation
Non-metals do not have lustre. They do not reflect light from their surface (exception - graphite, diamond and iodine). Non-metals have a dull appearance.
Option C is correct.
$$X+CuSO_4 \rightarrow XSO_4 + Cu$$,
$$Y+CuSO_4 \rightarrow YSO_4 +Cu$$
In these reactions X and Y may be :
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$$Zn, Ag$$
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$$Zn, Fe$$
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$$Fe, Ag$$
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$$Ag, Al$$
Explanation
Zn and Fe are more reactive than Cu and can displace it from its salt solution. So, in the above reaction X and Y may be Zn and Fe.
Metals are lustrous.
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True
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False
Explanation
Metals are lustrous because of the free electrons present in them. The light falling on these electrons is reflected. Thus, the metal surface appears shiny or lustrous.
Hence, option $$A$$ is correct.
Metals are good conductor of electricity but poor conductor of heat.
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True
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False
Explanation
Metals are good conductors of electricity and heat because they have a large number of free valence electrons that conduct electricity and heat.
Non-metal that has a metallic lustre and sublimes on heating is :
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chlorine
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bromine
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oxygen
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iodine
Explanation
Iodine is an intensely colored solid with an almost metallic lustre. This solid is relatively volatile and it sublimes when heated to form a violet-colored gas.
Option D is correct.
Why non-metals are not ductile?
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They are hard
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They are soft
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They are brittle
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All of above
Explanation
Non-metals are not ductile because they are brittle in nature. They break easily. Such non-metals cannot be deformed by a hammer or rolling.
Hence, option $$C$$ is correct.
Elements which form positively charged ions by losing electrons in all chemical reaction are called:
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metals
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non-metals
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metalloids
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none of the above
Explanation
The element (except hydrogen) which form positively charged ions (i.e. cations) by losing electrons in all chemical reactions are called metals.
Option $$A$$ is correct.
Metals are _________ i.e., they make sound when hit with an object.
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sonorous
0%
lustrous
0%
reactive
0%
brittle
Explanation
Since metals produce the ringing sound, they are said to be sonorous. Sound making property is known as sonority, i.e., when hit with an object they make a sound.
Hence, option $$A$$ is correct.
Which of the following is not a correct statement?
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Non-metals melt at low temperature
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Non-metals are generally bad conductors of heat and electricity
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Non-metals are non-sonorous
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Non-metals are malleable
Explanation
Non-metals are not malleable.
Non-metals are malleable, which is an incorrect statement.
Which of the following metal is a preferred material for making conducting wires and in electrical appliances? Even though silver is the best conductor of electricity.
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Gold
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Platinum
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Copper
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Lead
Explanation
Copper is widely used in electrical wiring, but silver is the best conductor. Silver is more expensive, though. Copper is used more often in electrical appliances because copper is less expensive.
The property by which some metals when hammered or stretched break into pieces is called:
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brittleness
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sonorous
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lustrous
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None of the above
Which metal is stored in kerosene oil?
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Sodium
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Calcium
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Iron
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None of the above
Explanation
Metals such as potassium and sodium react so vigorously that they catch fire if kept in the open. Hence, to protect them and to prevent accidental fires, they are kept immersed in kerosene oil.
Non metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
Which of the following is/are lustrous non-metals?
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Iodine
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Graphite
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Selenium
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Sulphur
Explanation
Iodine, graphite, diamond, etc. are lustrous but are non-metallic elements.
Options A and B are correct.
Generally, non-metals are not lustrous. Which of the following non-metal is lustrous?
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Sulphur
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Oxygen
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Nitrogen
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Iodine
Explanation
Lustre means to shine. Shining metals are also called lustrous metal. For example, gold. Non-metals such as sulphur, oxygen, nitrogen are non-lustrous but iodine is a greyish black solid and its crystals have a metallic lustre.
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
The non-metal which is known to form the largest number of compounds is:
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carbon
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sulphur
0%
nitrogen
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chlorine
Explanation
Carbon is a non-metal and is known to form the largest number of compounds due to two reasons:
Catenation - The ability of carbon to form bonds with the atoms of itself resulting in the large chains and rings of carbon. It causes a large no. of chain and ring compounds.
Tetravalency - Due to tetravalency, carbon can form bonds with other tetravalent elements and monovalent elements like hydrogen, chlorine, bromine etc.
Hence, option A is correct.
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