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CLASS VII SCIENCE
CLASS VII SCIENCE
CHAPTER IV: THE WORLD OF METALS AND NON-METALS
CHAPTER IV: THE WORLD OF METALS AND NON-METALS
Direct Questions Assertion / Reason Correct / Incorrect HOTS Challenging
DIRECT QUESTIONS
DIRECT QUESTIONS
The property by which metals can be beaten into thin sheets is called:
A. Ductility
B. Malleability
C. Lustre
D. Sonorous
Answer: B. Malleability
Which of the following is a non-metal that is liquid at room temperature?
A. Mercury
B. Bromine
C. Chlorine
D. Phosphorus
Answer: B. Bromine
Which metal is used for wrapping food items because of its high malleability?
A. Iron
B. Copper
C. Aluminium
D. Zinc
Answer: C. Aluminium
The property of metals by which they can be drawn into wires is:
A. Malleability
B. Ductility
C. Conductivity
D. Hardness
Answer: B. Ductility
Which non-metal is a good conductor of electricity?
A. Sulphur
B. Phosphorus
C. Graphite
D. Iodine
Answer: C. Graphite
Metals react with oxygen to produce:
A. Acidic oxides
B. Basic oxides
C. Neutral oxides
D. No reaction
Answer: B. Basic oxides
Which of the following is the most reactive metal?
A. Iron
B. Gold
C. Potassium
D. Copper
Answer: C. Potassium
What is the chemical symbol for Iron?
A. Ir
B. In
C. Fe
D. Pb
Answer: C. Fe
Non-metals generally react with oxygen to form:
A. Basic oxides
B. Acidic oxides
C. Amphoteric oxides
D. Only water
Answer: B. Acidic oxides
Which metal is stored in kerosene to prevent it from reacting with air and moisture?
A. Magnesium
B. Sodium
C. Silver
D. Calcium
Answer: B. Sodium
The sound produced when a metal object hits a hard surface is called:
A. Metallic sound
B. Sonorous
C. Resonance
D. Echo
Answer: B. Sonorous
Which gas is evolved when a metal reacts with a dilute acid?
A. Oxygen
B. Carbon dioxide
C. Hydrogen
D. Nitrogen
Answer: C. Hydrogen
Which of the following is a non-metal?
A. Iron
B. Aluminium
C. Sulphur
D. Magnesium
Answer: C. Sulphur
The process of depositing a layer of zinc on iron to prevent rusting is:
A. Crystallization
B. Galvanization
C. Oxidation
D. Reduction
Answer: B. Galvanization
Which of the following is the least reactive metal?
A. Silver
B. Zinc
C. Gold
D. Iron
Answer: C. Gold
Phosphorus is a very reactive non-metal and is stored in:
A. Kerosene
B. Alcohol
C. Water
D. Open air
Answer: C. Water
What is the nature of the solution formed when Magnesium ribbon is burnt and the ash is dissolved in water?
A. Acidic
B. Basic
C. Neutral
D. Highly acidic
Answer: B. Basic
Which metal is found in a liquid state at room temperature?
A. Sodium
B. Mercury
C. Calcium
D. Lithium
Answer: B. Mercury
Copper cannot displace zinc from its salt solution because:
A. Copper is more reactive than zinc
B. Copper is less reactive than zinc
C. Zinc is a non-metal
D. Both have same reactivity
Answer: B. Copper is less reactive than zinc
Which non-metal is used in purple-colored antiseptic solutions applied on wounds?
A. Chlorine
B. Iodine
C. Sulphur
D. Bromine
Answer: B. Iodine
Rust is formed when iron reacts with:
A. Only Oxygen
B. Only Water
C. Oxygen and Water (Moisture)
D. Nitrogen
Answer: C. Oxygen and Water (Moisture)
The chemical formula of Rust is:
A. FeO
B. Fe₂O₃
C. Fe₃O₄
D. Fe(OH)₂
Answer: B. Fe₂O₃
Which metal produces a 'pop' sound when a burning matchstick is brought near the gas evolved during its reaction with acid?
A. Iron
B. Zinc
C. Copper
D. Magnesium
Answer: B. Zinc (due to Hydrogen gas)
Non-metals do not react with:
A. Oxygen
B. Water
C. Chlorine
D. None of these
Answer: B. Water
Which metal is used in thermometers?
A. Lead
B. Tin
C. Mercury
D. Zinc
Answer: C. Mercury
Which of the following can be easily cut with a knife?
A. Iron
B. Sodium
C. Copper
D. Gold
Answer: B. Sodium
Which gas is used in disinfecting water?
A. Oxygen
B. Hydrogen
C. Chlorine
D. Helium
Answer: C. Chlorine
What happens when Sulphur dioxide is dissolved in water?
A. Sulphuric acid is formed
B. Sulphurous acid is formed
C. Magnesium oxide is formed
D. No change
Answer: B. Sulphurous acid (H₂SO₃)
Which of the following is used as a fuel?
A. Iron
B. Coal (Carbon)
C. Gold
D. Copper
Answer: B. Coal (Carbon)
Metals are generally ________ conductors of heat.
A. Poor
B. Good
C. Non
D. Moderate
Answer: B. Good
Which metal is present in hemoglobin?
A. Magnesium
B. Iron
C. Calcium
D. Copper
Answer: B. Iron
The white powder formed on burning Magnesium is:
A. Magnesium chloride
B. Magnesium oxide
C. Magnesium sulphate
D. Magnesium nitrate
Answer: B. Magnesium oxide
Which non-metal is used in crackers/fireworks?
A. Carbon
B. Sulphur
C. Iodine
D. Helium
Answer: B. Sulphur
Metals that are very soft can be cut with:
A. A saw
B. A knife
C. A hammer
D. Cannot be cut
Answer: B. A knife
The displacement reaction involves:
A. A less reactive metal displacing a more reactive one
B. A more reactive metal displacing a less reactive one
C. Non-metals only
D. Only gases
Answer: B. A more reactive metal displacing a less reactive one
Which non-metal is essential for our life and all living beings inhale it?
A. Nitrogen
B. Oxygen
C. Carbon dioxide
D. Argon
Answer: B. Oxygen
Iron reacts with Copper Sulphate solution to form:
A. Iron Oxide
B. Iron Sulphate
C. Iron Chloride
D. No reaction
Answer: B. Iron Sulphate
Which of the following is a lustrous non-metal?
A. Sulphur
B. Phosphorus
C. Iodine
D. Nitrogen
Answer: C. Iodine
Which metal is used in making electric wires?
A. Silver
B. Copper
C. Iron
D. Both A and B
Answer: D. Both A and B (Though Copper is used commercially)
Non-metals are generally:
A. Brittle
B. Ductile
C. Malleable
D. Sonorous
Answer: A. Brittle
Which of the following is NOT a property of non-metals?
A. Dull appearance
B. Poor conductors of heat
C. High melting point
D. Non-sonorous
Answer: C. High melting point
Which metal is used for making jewellery?
A. Sodium
B. Gold
C. Iron
D. Potassium
Answer: B. Gold
When Copper is exposed to moist air for a long time, it acquires a:
A. Red coating
B. Green coating
C. Black coating
D. Blue coating
Answer: B. Green coating
The green material on the surface of copper is a mixture of:
A. Copper hydroxide and Copper carbonate
B. Copper oxide and Copper sulphate
C. Copper chloride and Copper nitrate
D. Pure Copper
Answer: A. Copper hydroxide and Copper carbonate
Which non-metal is used in fertilizers to enhance the growth of plants?
A. Carbon
B. Nitrogen
C. Sulphur
D. Iodine
Answer: B. Nitrogen
Which of the following is the hardest natural substance?
A. Iron
B. Gold
C. Diamond (Carbon)
D. Copper
Answer: C. Diamond (Carbon)
Magnesium reacts with hot water to form:
A. Magnesium oxide
B. Magnesium hydroxide
C. Magnesium chloride
D. No reaction
Answer: B. Magnesium hydroxide
Which non-metal is used to make lead for pencils?
A. Sulphur
B. Graphite
C. Phosphorus
D. Silicon
Answer: B. Graphite
Which metal is most commonly used in the construction of bridges and skyscrapers?
A. Gold
B. Aluminium
C. Iron
D. Silver
Answer: C. Iron
The chemical formula of Sulphurous acid is:
A. H₂SO₄
B. H₂SO₃
C. H₂S
D. SO₂
Answer: B. H₂SO₃
ASSERTION AND REASON
ASSERTION AND REASON
A. Both A and R are true and R is the correct explanation of A.
B. Both A and R are true but R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.
Assertion (A): Sodium metal is stored under kerosene.
Reason (R): Sodium is very reactive and reacts vigorously with air and water.
Answer: A. Both A and R are true and R is the correct explanation of A.
Assertion (A): Non-metals are used to make bells.
Reason (R): Non-metals are sonorous in nature.
Answer: D. A is false but R is true (Assertion is false, Reason is also false, but in this logic D fits best as R is generally false for non-metals).
Assertion (A): Aluminium foils are used to wrap food items.
Reason (R): Aluminium is highly malleable and does not react with food easily.
Answer: A. Both A and R are true and R is the correct explanation of A.
Assertion (A): Iron can displace Copper from Copper Sulphate solution.
Reason (R): Iron is more reactive than Copper.
Answer: A. Both A and R are true and R is the correct explanation of A.
Assertion (A): Graphite is a non-metal.
Reason (R): Graphite is a good conductor of electricity.
Answer: B. Both A and R are true but R is not the correct explanation of A.
Assertion (A): Gold and Platinum are found in the native state in nature.
Reason (R): They are very reactive metals.
Answer: C. A is true but R is false.
Assertion (A): Phosphorus is stored in water.
Reason (R): It catches fire when exposed to air.
Answer: A. Both A and R are true and R is the correct explanation of A.
Assertion (A): Oxides of non-metals are acidic in nature.
Reason (R): They turn red litmus paper blue.
Answer: C. A is true but R is false.
Assertion (A): Magnesium ribbon burns with a dazzling white flame.
Reason (R): It reacts with oxygen to form Magnesium Oxide.
Answer: A. Both A and R are true and R is the correct explanation of A.
Assertion (A): Copper can displace Zinc from Zinc Sulphate solution.
Reason (R): Zinc is more reactive than Copper.
Answer: D. A is false but R is true.
CORRECT / INCORRECT STATEMENTS
CORRECT / INCORRECT STATEMENTS
Which of the following statements is INCORRECT?
A. Metals are generally hard.
B. Mercury is a liquid metal.
C. Most non-metals are good conductors of heat.
D. Metals produce ringing sounds.
Answer: C. Most non-metals are good conductors of heat.
Identify the CORRECT statement:
A. Sodium is a very hard metal.
B. Silver is the best conductor of electricity.
C. Non-metals react with acids to produce hydrogen gas.
D. Coal can be drawn into wires.
Answer: B. Silver is the best conductor of electricity.
Which of the following about reactivity is CORRECT?
A. Iron is more reactive than Sodium.
B. Copper is more reactive than Iron.
C. Zinc is more reactive than Copper.
D. Gold is more reactive than Silver.
Answer: C. Zinc is more reactive than Copper.
Find the INCORRECT statement:
A. Metals react with bases to produce hydrogen gas.
B. Sulphur reacts with water to form an acid.
C. Copper is used in electrical wiring.
D. Bromine is a liquid non-metal.
Answer: B. Sulphur reacts with water to form an acid.
Which statement about Magnesium is CORRECT?
A. It is a non-metal.
B. Its oxide turns blue litmus red.
C. It reacts with dilute HCl to produce hydrogen gas.
D. It cannot be burnt in air.
Answer: C. It reacts with dilute HCl to produce hydrogen gas.
Identify the INCORRECT statement about non-metals:
A. They are generally gases or solids.
B. They are non-malleable.
C. They are sonorous.
D. They have a dull appearance.
Answer: C. They are sonorous.
Which of the following is CORRECT regarding the displacement reaction?
A. Fe + CuSO₄ → FeSO₄ + Cu
B. Cu + FeSO₄ → CuSO₄ + Fe
C. Zn + FeSO₄ → No reaction
D. Cu + ZnSO₄ → CuSO₄ + Zn
Answer: A. Fe + CuSO₄ → FeSO₄ + Cu
Select the CORRECT statement about Rusting:
A. It is a physical change.
B. It requires only water.
C. It can be prevented by painting.
D. It makes the iron stronger.
Answer: C. It can be prevented by painting.
Identify the INCORRECT statement:
A. Carbon is a non-metal.
B. Chlorine is used in water purification.
C. Iodine is a metal because it is lustrous.
D. Nitrogen is used in food packaging.
Answer: C. Iodine is a metal because it is lustrous.
Which statement is CORRECT?
A. All metals are solids at room temperature.
B. Non-metals form basic oxides.
C. Generally, metals have high density.
D. Copper reacts with dilute Sulphuric acid to give Hydrogen gas.
Answer: C. Generally, metals have high density.
HOTS (HIGHER ORDER THINKING SKILLS)
HOTS (HIGHER ORDER THINKING SKILLS)
Why is it advised not to store pickles or lemon juice in aluminium or copper containers?
A. The container will break.
B. The acid in the food reacts with the metal to produce toxic salts.
C. The food will turn sweet.
D. The metal will melt.
Answer: B. The acid in the food reacts with the metal to produce toxic salts.
If you have two rods, one made of Sulphur and one made of Iron, how can you distinguish them by hitting them with a hammer?
A. Iron will break into pieces, Sulphur will stretch.
B. Sulphur will break into pieces (brittle), while Iron will flatten (malleable).
C. Both will break.
D. Both will flatten.
Answer: B. Sulphur will break into pieces (brittle), while Iron will flatten (malleable).
Why are copper wires often used in household circuits even though silver is a better conductor?
A. Silver is a non-metal.
B. Copper is cheaper and more easily available than silver.
C. Silver reacts too quickly with air.
D. Copper is more beautiful.
Answer: B. Copper is cheaper and more easily available than silver.
What will happen if a strip of zinc is kept in a solution of copper sulphate for some time?
A. The solution turns red.
B. The blue color of the solution fades and a reddish-brown deposit forms.
C. No change occurs.
D. The solution turns green.
Answer: B. The blue color of the solution fades and a reddish-brown deposit forms.
Why does a magnesium ribbon need to be cleaned with sandpaper before burning in air?
A. To make it shiny.
B. To remove the layer of magnesium oxide formed by reaction with moist air.
C. To decrease its temperature.
D. To make it more flexible.
Answer: B. To remove the layer of magnesium oxide formed by reaction with moist air.
A doctor prescribed an iron supplement to a patient. Does this mean the patient has pieces of iron metal in their body?
A. Yes, tiny iron nails.
B. No, it means the patient has a deficiency of iron ions in the blood.
C. No, the doctor is joking.
D. Yes, the patient needs to eat magnets.
Answer: B. No, it means the patient has a deficiency of iron ions in the blood.
If non-metals are non-conductors, why is Graphite used in dry cells (batteries)?
A. Because it is a metal.
B. Because it is an exception and conducts electricity due to its structure.
C. Because it prevents the battery from leaking.
D. Because it is very cheap.
Answer: B. Because it is an exception and conducts electricity due to its structure.
Why do we paint iron gates during the rainy season?
A. To make them look new.
B. To prevent the iron from coming into contact with moisture and oxygen, avoiding rust.
C. To make the gates easier to open.
D. To attract sunlight.
Answer: B. To prevent the iron from coming into contact with moisture and oxygen, avoiding rust.
A copper plate was placed in a silver nitrate solution. After some time, the solution turned blue. Why?
A. Copper is less reactive than silver.
B. Copper displaced silver, forming blue copper nitrate.
C. Silver turned blue.
D. The plate dissolved completely.
Answer: B. Copper displaced silver, forming blue copper nitrate.
Why is nitrogen gas used to fill food packets like chips?
A. To make the packet look bigger.
B. Because it is an inert gas that prevents the oxidation (rancidity) of oils in food.
C. To make the chips spicy.
D. Because it is very cold.
Answer: B. Because it is an inert gas that prevents the oxidation (rancidity) of oils in food.
CHALLENGING QUESTIONS
CHALLENGING QUESTIONS
Which of the following metals will NOT react even with steam?
A. Iron
B. Magnesium
C. Silver
D. Aluminium
Answer: C. Silver
When a non-metal 'X' is treated with concentrated Nitric acid, it produces a gas 'Y'. If 'X' is Carbon, 'Y' is:
A. Oxygen
B. Hydrogen
C. Carbon dioxide
D. Nitrogen
Answer: C. Carbon dioxide
An alloy is a:
A. Pure metal
B. Mixture of metals or a metal and a non-metal
C. Compound of two metals
D. Non-metal
Answer: B. Mixture of metals or a metal and a non-metal
Which of the following pair will give a displacement reaction?
A. NaCl solution and Copper metal
B. MgCl₂ solution and Aluminium metal
/C. FeSO₄ solution and Silver metal
D. AgNO₃ solution and Copper metal
Answer: D. AgNO₃ solution and Copper metal
What is the pH of a solution formed by dissolving Phosphorus pentoxide in water?
A. pH = 7
B. pH > 7
C. pH < 7
D. pH = 14
Answer: C. pH < 7 (Acidic oxide)
In the reactivity series, which metal is placed just below Hydrogen?
A. Copper
B. Iron
C. Zinc
D. Magnesium
Answer: A. Copper
Which property of metals is used in making musical instruments like guitars?
A. Malleability
/B. Ductility
C. Sonorousness and elasticity
D. Thermal conductivity
Answer: C. Sonorousness and elasticity
Which non-metal exists in different forms called allotropes?
A. Sulphur
B. Carbon
C. Phosphorus
D. All of these
Answer: D. All of these
Stainless steel is an alloy of iron with:
A. Carbon only
B. Chromium and Nickel
C. Copper and Tin
D. Zinc and Lead
Answer: B. Chromium and Nickel
A metal 'M' reacts with cold water vigorously. 'M' is likely:
A. Magnesium
B. Sodium
C. Iron
D. Copper
Answer: B. Sodium
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