MCQ Questions for Class 8 Science Chapter 4 Materials: Metals and Non-Metals
Solving the Materials: Metals and Non-Metals Multiple Choice Questions of Class 8 Science Chapter 4 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on Materials: Metals and Non-Metals Class 8 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Have a glance at the MCQ of Chapter 4 Science Class 8 and cross-check your answers during preparation.
Question 1.
The metal having fastest rate of formation of bubbles of hydrogen with dil. HCl is
(a) zinc
(b) copper
(c) magnesium
(d) silver
Answer
(c) magnesium
Magnesium is higher in reactivity series therefore the rate of formation of bubbles of hydrogen with dil HC1 is fastest.
Question 2.
The non-metal which has very high melting point is:
(a) sulphur
(b) iodine
(c) phosphorus
(d) graphite
Answer
(d) graphite
Graphite is a non-metal having very high melting point.
Question 3.
The non-metal which is good conductor of electricity is:
(a) sulphur
(b) iodine
(c) phosphorus
(d) graphite
Answer
(d) graphite
Graphite is the only non-metal which is a good conductor of electricity.
Question 4.
The non-metal which is liquid at room temperature is:
(a) chlorine
(b) bromine
(c) iodine
(d) carbon
Answer
(b) bromine
Bromine is the non-metal which is liquid at room temperature.
Question 5.
The colour of chlorine is:
(a) yellow
(b) white
(c) green
(d) yellowish green
Answer
(d) yellowish green
The colour of chlorine is yellowish green.
Question 6.
The metal which cannot be stored in packets is:
(a) sodium
(b) calcium
(c) magnesium
(d) zinc
Answer
(a) sodium
Sodium cannot be stored in packets because it will catch fire.
Question 7.
The metal which is poorest conductor of heat is:
(a) mercury
(b) zinc
(c) lead
(d) copper
Answer
(c) lead
Lead is the metal which is poorest conductor of heat.
Question 8.
Property of producing sound by metals is called:
(a) malleability
(b) sonority
(c) ductility
(d) none of these
Answer
(b) sonority
Sonority is the property of producing sound by metals.
Question 9.
The metal which develops a protective layer over its surface by reaction with air is:
(a) zinc
(b) aluminium
(c) iron
(d) silver
Answer
(b) aluminium
Aluminium metal develops a protective layer of aluminium oxide over its surface by reaction with air.
Question 10.
The metal not corroded by air, water and acid is :
(a) copper
(c) gold
(b) zinc
(d) aluminium
Answer
(c) gold
Gold metal is not corroded by air, water and acid because one of the least reative metals reactivity series.
Question 11.
The metal which is soft is:
(a) sodium
(c) silver
(b) gold
(d) copper
Answer
(a) sodium
Sodium metal is soft whereas gold, silver and copper are solids.
Question 12.
The correct statement is:
(a) all metals are ductile
(c) generally, metals are ductile
(b) all non-metals are ductile
(d) some non-metals are ductile
Answer
(c) generally, metals are ductile
Generally, metals are ductile. Sodium, potassium, calcium etc. are not ductile.
Question 13.
When copper is added to iron sulphate solution:
(a) iron is displaced
(b) S04 is displaced
(c) no reaction takes place
(d) non of these
Answer
(c) no reaction takes place
When copper is added to iron sulphate solution then no reaction takes place because copper is below iron in reactivity series.
Question 14.
Arrange the following in the order of their decreasing chemical activity: magnesium, potassium, iron and gold.
(a) magnesium, potassium, iron, gold
(b) magnesium, iron, potassium, gold
(c) potassium, magnesium, iron, gold
(d) none of these
Answer
(c) potassium, magnesium, iron, gold
Potassium, magnesium, iron, gold.
Question 15.
Which of the following is true about metals:
(a) metals generally have low melting point
(b) metal generally have a shiny appearance
(c) metals are poor conductors of heat and electricity
(d) metals are non-malleable and non-ductiles
Answer
(b) metal generally have a shiny appearance
Metals generally have a shiny appearance. They have high melting point, are good conductors of heat and electricity. They are malleable and ductile.
Question 16.
Which one of the following is most ductile:
(a) Aluminium
(b) Copper
(c) Silver
(d) Gold
Answer
(d) Gold
Gold is most ductile.
Question 17.
Which one of the following metals is most reactiVe and stored in kerosene oil:
(a) Iron
(b) Gold
(c) Copper
(d) Sodium
Answer
(d) Sodium
Sodium is most reactive and stored in kerosene oil. Sodium reacts with air and water at room temperature.
Question 18.
Which one of the following metals will not liberate hydrogen gas when attacked by dilute hydrochloric acid:
(a) magnesium
(b) zinc
(c) copper
(d) aluminium
Answer
(c) copper
Copper will not liberate hydrogen gas when attacked by dilute hydrochloric acid because it is very low in reactivity series.
Question 19.
For rusting of iron:
(a) only moisture is required
(b) only air is required
(c) both moisture and air is required
(d) neither moisture nor air is required
Answer
(c) both moisture and air is required
Both moisture and air is required for rusting of iron.
Question 20.
The property of metals by virtue of which metal can be hammered into very thin sheets is called:
(a) ductility
(b) malleability
(c) lustre
(d) sonorus
Answer
(b) malleability
Malleability is the property of metals by virtue of which metals can be hammered into very thin sheets.
Question 21.
Non-metals react with oxygen and form:
(a) natural oxides
(b) acidic oxides
(c) basic oxides
(d) none of these
Answer
(b) acidic oxides
Non-metals react with oxygen and forms non-metallic oxides which are acidic in nature.
Question 22.
Metals react with oxygen to form:
(a) basic oxides
(c) acidic oxides
(b) neutral oxides
(d) none of these
Answer
(c) acidic oxides
Metals react with oxygen and form metallic oxides which are Basic in nature.
Question 23.
Metals can form long wires. This property of metals is known as:
(a) sonorous
(c) malleability
(b) ductility
(d) none of these
Answer
(b) ductility
Ductility is the property of metal to form long wires.
Question 24.
The best electrical conductor is:
(a) gold
(b) silver
(c) copper
(d) aluminium
Answer
(b) silver
Silver is the best conductor of electricity.
Question 25.
Which of the following can be beaten into thin sheets ?
(a) oxygen
(b) carbon
(c) aluminium
(d) phosphorus
Answer
(c) aluminium
Aluminium can be beaten into thin sheets because it is a metal whereas oxygen, carbon and phosphorus are non-metals.
Question 26.
The metal which reacts violently with cold water is:
(a) zinc
(b) aluminium
(c) sodium
(d) copper
Answer
(c) sodium
Sodium reacts violently with cold water because it is high in the reactivity series.
Question 27.
A liquid metal is:
(a) bromine
(c) iodine
(b) nitrogen
(d) mercury
Answer
(d) mercury
Mercury is liquid metal. Bromine, nitrogen and iodine are non-metals.
Question 28.
The gas produced when metals react with sodium hydroxide is:
(a) nitrogen
(c) oxygen
(b) hydrogen
(d) water vapour
Answer
(b) hydrogen
Hydrogen gas is produced when metals react with sodium hydroxide.
Question 29.
The gas produced when metals reacts with dilute acids is:
(a) nitrogen
(b) carbon dioxide
(c) oxygen
(d) hydrogen
Answer
(d) hydrogen
Hydrogen gas is produced when metals react with dilute acids.
Question 30.
Sulphur reacts with hot concentrated nitric acid and produces:
(a) sulphur dioxide
(b) sulphur trioxide
(c) nitrogen dioxide
(d) sulphur dioxide and Nitrogen dioxide
Answer
(d) sulphur dioxide and Nitrogen dioxide
Sulphur reacts with hot concentrated nitric acid and produces sulphur dioxide, nitrogen dioxide and water
Match the Column-A with Column-B:
Question 1.
| Column-A | Column-B |
| (a) Metal which is liquid at room temperature | (i) Iodine |
| (b) Non-metal which is liquid at room temperature | (ii) Sodium |
| (c) Non-metal which is solid at room temperature | (iii) Mercury |
| (d) Metal which is poor conductor of heat | (iv) Bromine |
| (e) A soft metal | (v) Lead |
Answer
| Column-A | Column-B |
| (a) Metal which is liquid at room temperature | (iii) Mercury |
| (b) Non-metal which is liquid at room temperature | (iv) Bromine |
| (c) Non-metal which is solid at room temperature | (i) Iodine |
| (d) Metal which is poor conductor of heat | (v) Lead |
| (e) A soft metal | (ii) Sodium |
Question 2.
| Column-A | Column-B |
| (a) Gallium | (i) Gas at room temperature |
| (b) Potassium | (ii) Best condutor of heat |
| (c) Silver | (iii) Solid non-metal at room temperature |
| (d) Iodine | (iv) Soft metal |
| (e) Helium | (v) Melts on our palm |
Answer
| Column-A | Column-B |
| (a) Gallium | (v) Melts on our palm |
| (b) Potassium | (iv) Soft metal |
| (c) Silver | (ii) Best condutor of heat |
| (d) Iodine | (iii) Solid non-metal at room temperature |
| (e) Helium | (i) Gas at room temperature |
Question 3.
| Column-A | Column-B |
| (a) Gold | (i) Thermometers |
| (b) Iron | (ii) Electric wire |
| (c) Aluminium | (iii) Wrapping food |
| (d) Copper | (iv) Jewellery |
| (e) Mercury | (v) Machinery |
Answer
| Column-A | Column-B |
| (a) Gold | (iv) Jewellery |
| (b) Iron | (v) Machinery |
| (c) Aluminium | (iii) Wrapping food |
| (d) Copper | (ii) Electric wire |
| (e) Mercury | (i) Thermometers |
State whether the following statements are True or False:
Question 1.
Aluminium foils are used to wrap food items.
Answer
True
Question 2.
Immersion rods for heating liquids are made up of non-metallic substances.
Answer
False
Question 3.
Copper can displace zinc from its salt solution.
Answer
False
Question 4.
Sodium and potassium are stored in kerosene.
Answer
True
Question 5.
The surface of most metals have shiny appearance.
Answer
True
Question 6.
Lemon pickle can be stored in an aluminium utensil.
Answer
False
Question 7.
Copper is used for electrical wiring.
Answer
True
Question 8.
Gold is not found hi the free state.
Answer
False
Question 9.
Sodium does not occur in the free state.
Answer
True
Question 10.
Iron is used to construct bridges and houses.
Answer
True
Question 11.
Sodium reacts violently with cold water forming sodium hydroxide.
Answer
True
Question 12.
Less reactive metals displace more reactive metals from their compounds in aqueous solutions.
Answer
False
Question 13.
Non-metals react with oxygen to produce non-metallic oxides which are acidic in nature.
Answer
False
Question 14.
‘Pop’ sound indicates the presence of hydrogen gas.
Answer
True
Question 15.
The sulphurous acid turns red litmus blue.
Answer
False
Fill in the blanks:
Question 1.
All metals except ………………….. are solids at room temperature.
Answer
mercury
Question 2.
Melting point of most of the metals is ………………….. than non-metals.
Answer
more
Question 3.
Gold is at the ………………….. of the reactivity scries of metals.
Answer
bottom
Question 4.
Iron needs ………………….. and ………………….. to rust.
Answer
water and air
Question 5.
The property which allows metals to be hammered into thin sheets is ……………………
Answer
malleable
Question 6.
Non-metals are ………………….. conductors of heat and electricity.
Answer
poor
Question 7.
Metals react with oxygen to produce ………………….. oxides.
Answer
basic
Question 8.
Zinc is ………………….. reactive than copper.
Answer
more
Question 9.
Iron displaces ………………….. from copper sulphate solution.
Answer
copper
Question 10.
Phosphorus is a very ………………….. non-metal.
Answer
reactive
Question 11.
Copper sulphate + Zinc → ………………….. + …………………..
Answer
Zinc sulphate + Copper
Question 12.
………………….. is the property of metals by which it can be drawn into wires.
Answer
Ductility
Question 13.
………………….. substances when hammered break into small pieces.
Answer
Brittle
Question 14.
Acid oxides are oxides which turn ………………….. litmus paper to ……………………
Answer
blue, red
Question 15.
Basic oxides are oxides which turn ………………….. litmus paper to ……………………
Answer
red, blue
Question 16.
The shiny appearance on the cut surface of metals is called …………………..
Answer
metallic lustre
Question 17.
Coal is ………………….. conductor of electricity.
Answer
poor
Question 18.
Metals react with acid to produce ………………….. gas.
Answer
hydrogen
Question 19.
………………….. reactive metals displace ………………….. reactive metals from their compounds in aqueous solutions.
Answer
More, less
Question 20.
Phosphorus is stored in …………………..
Answer
water
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