Class 8 chemistry MCQs with answers are provided here for Chapter 4 Materials: Metals and Non-metal. These MCQs are based on the CBSE board curriculum and correspond to the most recent Class 8 chemistry syllabus. By practising these Class 8 multiple choice questions, students will be able to quickly review all of the ideas covered in the chapter and prepare for the Class 8 annual examinations as well as other competitive exams.
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Class 8 Materials: Metals and Non-Metal MCQs
Q-1: Which of the following acids is formed when sulphur dioxide is dissolved in water?
a) Sulphuric acid
b) Sulphurous acid
c) Thiosulphurous acid
d) None of the above
Answer: b) Sulphurous acid
Explanation: When sulphur dioxide is dissolved in water, sulphurous acid is formed.
The reaction can be given as follows: Sulphur dioxide (SO2 ) + Water (H2O) → Sulphurous acid (H2SO3).
Q-2: What kind of sound does hydrogen gas make when a lit candle is placed close to the mouth of the test tube where it is evolved?
a) Tinkling
b) Pop
c) Bell tone
d) Sizzle
Answer: b) Pop
Explanation: When a lit candle is held close to hydrogen gas, which is combustible, the hydrogen gas ignites with a pop sound.
Q-3: Which of the following is a non-metal that can be stored in the water?
a) Sodium
b) Potassium
c) Phosphorous
d) Calcium
Answer: c) Phosphorous
Explanation: The non-metal phosphorus is very reactive. If it is exposed to air, it burns. Phosphorus is held in water to avoid coming into touch with the oxygen in the atmosphere.
Q-4: Which of the following causes blue litmus paper to turn red?
a) Lubricating grease
b) Baking Soda
c) Vinegar
d) Soap
Answer: c) Vinegar
Explanation: Acids cause the blue litmus paper to turn red. Acetic acid can be found in vinegar. As a result, it causes red on blue litmus paper.
Q-5: Which gas results from the reaction of metals and sodium hydroxide?
a) Oxygen gas
b) Hydrogen gas
c) Carbon dioxide gas
d) All of the above
Answer: b) Hydrogen gas
Q-6: Which of the following can displace copper from copper sulphate?
a) Silver
b) Zinc
c) Platinum
d) Gold
Answer: b) Zinc
Explanation: A more reactive metal can displace a less reactive metal, but a less reactive one cannot displace a more reactive metal. Since zinc is more reactive than copper, it can displace copper from copper sulphate.
Q-7: Which of the following, when hammered, can become a powdery mass?
a) Aluminium
b) Carbon
c) Magnesium
d) Iron
Answer: b) Carbon
Explanation: Non-Metals are not malleable. When non-malleable materials are hammered, they become a powdery mass. When hammered, carbon, as a nonmetal, turns into a powdery mass.
Q-8: Some materials have properties such as hardness, lustrousness, malleability, ductility, sonority, and good conductivity of heat and electricity. Identify the material.
a) Non-metals
b) Metals
c) Semiconductors
d) Insulators
Answer: b) Metals
Explanation: The listed properties are the characteristic properties only for metals.
Q-9: Which of the following is not a non-metal?
a) O
b) Cl
c) Be
d) Graphite
Answer: c) Be
Q-10: What is the correct formula for the product formed when magnesium reacts with oxygen?
a) Mg2O
b) MgO
c) MgO2
d) Mg2O2
Answer: b) MgO
Explanation: When magnesium reacts with oxygen, the following reaction occurs:
2Mg + O2 → 2MgO + heat
Q-11: Which of the following oxide is acidic in nature?
a) CaO
b) Al2O3
c) SO2
d) K2O
Answer: c) SO2
Explanation: Oxides that are made from non-metals have an acidic nature. Since SO2 is an oxide of a non-metal, it has an acidic nature.
Q-12: Which of the following is not a metal and is solid?
a) Chlorine
b) Iodine
c) Bromine
d) Sodium
Answer: b) Iodine
Explanation: Iodine exists in a solid state and is not a metal. While chlorine and bromine have gaseous and liquid states, respectively, and are non-metal. Sodium is a metal.
Q-13: Which of the following non metals is lustrous?
a) Oxygen
b) Bromine
c) Iodine
d) Chlorine
Answer: c) Iodine
Explanation: Lustrous is the state of being shiny. Iodine is the only non metal which is lustrous in nature.
Q-14: Metals are typically solid by nature. At room temperature, which of the following metals is in a liquid state?
a) Br
b) Hg
c) Na
d) I
Answer: b) Hg
Explanation: At room temperature, mercury is the only metal that is liquid. Br and I are nonmetals that exist as gases and solids, respectively. Sodium is a metal that is solid.
Q-15: Which of the following characteristics of aluminium makes it appropriate as a wire?
a) Ductility and a good conductor of electricity
b) Only good conductor of electricity
c) Only ductility
d) Malleability
Answer: a) Ductility and good conductor of electricity
Explanation: A substance must be able to be transformed into thin wire while maintaining a high tensile strength in order to qualify as wire. The term “ductility” refers to this quality. Additionally, it should be a good conductor of electricity and conducting in nature.
Q-16: What is the colour of the coating a copper vessel develops when exposed to air?
a) Reddish Brown
b) Green
c) Silvery
d) Black
Answer: b) Green
Explanation: When a copper vessel is exposed to moist air for long, it acquires a dull green coating. The green material is a mixture of copper hydroxide (Cu(OH)2 ) and copper carbonate (CuCO3).
Q-17: Which of the following metals reacts with water slowly?
a) Na
b) K
c) Fe
d) P
Answer: c) Fe
Q-18: Identify the metal that satisfies the flow chart given below:
a) Carbon
b) Iron
c) Calcium
d) Copper
Answer: c) Calcium
Explanation:
Carbon reacts with oxygen as: C + O2 → CO2
CO2 is soluble in water but does not have a high melting point.
Iron reacts with oxygen as: 4Fe + 3O2 → 2Fe2O3
Fe2O3 has a high melting point but is insoluble in water.
Calcium reacts with oxygen in the following way:
2Ca + O2 → 2CaO
CaO is most soluble in water and also has a high melting point.
Copper reacts with oxygen as: 2Cu + O2 → 2CuO
CuO has a high melting point but is insoluble in water.
From the above discussion, we can clearly state that option c) is the correct answer.
Q-19: Which of the following combinations is not correct for the below chemical reaction?
Metal + Oxygen → Metal Oxide
| Sl. No | Metal | Nature of Metal Oxide |
|---|---|---|
| i) | Calcium | Acidic |
| ii) | Zinc | Basic |
| iii) | Aluminium | Amphoteric |
| iv) | Potassium | Basic |
a) i), ii) and iv)
b) i) and ii)
c) ii) and iii)
d) i) and iii)
Answer: b) i) and ii)
Explanation: Metal oxides can be basic or amphoteric. Nonmetals, on the other hand, form oxides that are either acidic or neutral. Amphoteric oxides are capable of reacting with both acids and bases.
Because calcium is a metal, it produces a basic oxide, whereas zinc produces an amphoteric oxide. Both aluminium (a metal) and potassium (a metal) produce amphoteric and basic oxides, respectively.
Q-20: Which of the given test tubes will produce a pop sound when a burning splinter is brought near to its mouth?
a) P: Fe(s) + HCl(aq)
b) Q: Cu(s) + HCl (aq)
c) R: Ag(s) + HNO3(aq)
d) S: Al(s) + HNO3(aq)
Answer: a) P: Fe(s) + HCl(aq)
Explanation: The following are the various reactions taking place in the different test tubes:
Fe(s) + 2HCl(aq) → FeCl2(aq) + H2 (g)
Cu(s) + HCl (aq) → No reaction
Ag(s) + 2HNO3(aq) → AgNO3(aq) + H2O (l) + NO2(g)
Al(s) + HNO3(aq) → Al(NO3)3(aq) + 3H2O (l) + 3NO2(g)
The above reactions clearly show that only in the P test tube, H2 gas is being evolved, and it is this gas that burns with a pop sound when a burning splint is brought close to its mouth.
Read Also:
- Difference between Metals and Non metals
- Non Metals
- Properties of Metals and Non metals
- Chemical Properties of Metals
- Materials: Metals and Non-Metals Important Questions with Answers
- Chapter 8 – Materials:Metals and Non-Metals Worksheet-Set-1
- Chapter 8 – Materials:Metals and Non-Metals Worksheet-Set-2
- Chapter 8 – Materials:Metals and Non-Metals Worksheet-Set-3
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