Metals Questions

Objective questions

Which of the following is a common physical property of metals?

A) Brittle B) Poor conductor C) Ductile D) Low density

Correct Answer: C) Ductile

Metals conduct electricity because:

A) They contain free-moving protons B) They form covalent bonds C) They have delocalized electrons D) They are crystalline solids

Correct Answer: C) They have delocalized electrons

Which metal is liquid at room temperature?

A) Sodium B) Iron C) Mercury D) Calcium

Correct Answer: C) Mercury

What property makes metals sonorous?

A) High melting point B) Ability to conduct electricity C) Production of ringing sound when struck D) High density

Correct Answer: C) Production of ringing sound when struck

Which two metals are exceptions due to their low melting points and softness?

A) Iron and copper B) Sodium and potassium C) Calcium and aluminum D) Tin and mercury

Correct Answer: B) Sodium and potassium

Sodium belongs to which group of the periodic table?

A) Group I B) Group II C) Group IV D) Transition metals

Correct Answer: A) Group I

The flame color produced by sodium is:

A) Crimson red B) Golden yellow C) Lilac D) Green

Correct Answer: B) Golden yellow

Sodium is extracted industrially by:

A) Reduction with carbon B) Heating in air C) Electrolysis of fused sodium chloride D) Roasting with oxygen

Correct Answer: C) Electrolysis of fused sodium chloride

Which process uses a NaCl-KCl-KF mixture to extract sodium?

A) Bayer process B) Castner process C) Down’s process D) Hall-Héroult process

Correct Answer: C) Down’s process

A major by-product of sodium extraction by electrolysis is:

A) Oxygen gas B) Hydrogen gas C) Potassium hydroxide D) Chlorine gas

Correct Answer: D) Chlorine gas

What is a use of sodium hydroxide (NaOH)?

A) Fertilizer B) Desiccant C) Bleaching powder D) Soap making

Correct Answer: D) Soap making

Which sodium compound is used in making glass and softening water?

A) NaCl B) NaNO₃ C) Na₂CO₃ D) NaOH

Correct Answer: C) Na₂CO₃

What is the anhydrous form of sodium sulfate known as?

A) Soda ash B) Glauber’s salt C) Salt cake D) Washing soda

Correct Answer: C) Salt cake

Which sodium compound is used as a nitrogen fertilizer?

A) Sodium chloride B) Sodium nitrate C) Sodium carbonate D) Sodium hydroxide

Correct Answer: B) Sodium nitrate

Sodium reacts with cold water to produce:

A) Na₂O and H₂ B) NaOH and H₂ C) NaCl and H₂ D) Na₂CO₃ and H₂

Correct Answer: B) NaOH and H₂

What is the main source of calcium extraction?

A) Bauxite B) Limestone (CaCO₃) C) Cassiterite D) Sylvite

Correct Answer: B) Limestone (CaCO₃)

Calcium reacts with water to form:

A) CaCl₂ B) CaCO₃ C) Ca(OH)₂ and H₂ D) CaO and CO₂

Correct Answer: C) Ca(OH)₂ and H₂

Which of the following is a use of calcium oxide (quicklime)?

A) Water purification B) Reducing metal oxides C) Soil neutralization D) Bleaching

Correct Answer: C) Soil neutralization

Calcium hydroxide is also called:

A) Quicklime B) Chalk C) Slaked lime D) Limewater

Correct Answer: C) Slaked lime

Calcium carbonate reacts with hydrochloric acid to produce:

A) Ca(OH)₂ and CO₂ B) CaCl₂, H₂O and CO₂ C) CaCl₂ and H₂ D) CaO and HCl

Correct Answer: B) CaCl₂, H₂O and CO₂

The main ore of aluminium is:

A) Hematite B) Bauxite C) Cassiterite D) Dolomite

Correct Answer: B) Bauxite

Aluminium is extracted using:

A) Reduction with carbon B) Roasting C) Electrolysis of alumina in molten cryolite D) Smelting

Correct Answer: C) Electrolysis of alumina in molten cryolite

What is the role of cryolite in aluminium extraction?

A) Oxidizing agent B) Lower melting point C) Forms slag D) Reacts with oxygen

Correct Answer: B) Lower melting point

Which gas is formed at the anode during aluminium electrolysis?

A) Hydrogen B) Carbon dioxide C) Oxygen D) Nitrogen

Correct Answer: B) Carbon dioxide

A protective oxide layer on aluminium prevents:

A) Heat absorption B) Reaction with acids C) Corrosion D) Solubility

Correct Answer: C) Corrosion

Rust is chemically known as:

A) Iron(II) oxide B) Iron sulfate C) Hydrated iron(III) oxide D) Iron carbonate

Correct Answer: C) Hydrated iron(III) oxide

Which condition is necessary for rusting?

A) Acid and water B) Air and light C) Air and moisture D) Heat and oxygen

Correct Answer: C) Air and moisture

A common method of preventing rust is:

A) Electrolysis B) Galvanizing C) Bending D) Distillation

Correct Answer: B) Galvanizing

Iron reacts with steam to form:

A) Fe₂O₃ and H₂ B) Fe and H₂O C) FeCl₃ D) Fe₃O₄ and H₂

Correct Answer: D) Fe₃O₄ and H₂

Iron forms green precipitate with NaOH when it is in the:

A) +3 oxidation state B) +2 oxidation state C) +1 oxidation state D) 0 oxidation state

Correct Answer: B) +2 oxidation state

The main ore of tin is:

A) Bauxite B) Tinstone (SnO₂) C) Hematite D) Dolomite

Correct Answer: B) Tinstone (SnO₂)

Tin extraction involves reduction of its oxide with:

A) Hydrogen B) Aluminium C) Carbon (coke) D) Calcium

Correct Answer: C) Carbon (coke)

A key property of tin that makes it useful in canning is:

A) Radioactivity B) Toxicity C) Non-toxicity and corrosion resistance D) High density

Correct Answer: C) Non-toxicity and corrosion resistance

Which of the following alloys contains tin and copper?

A) Solder B) Bronze C) Steel D) Duralumin

Correct Answer: B) Bronze

Tin reacts with air to form:

A) SnCl₂ B) SnO₂ C) Sn(OH)₂ D) SnSO₄

Correct Answer: B) SnO₂

Which of these metals is commonly used in overhead power cables?

A) Iron B) Aluminium C) Tin D) Calcium

Correct Answer: B) Aluminium

The test that distinguishes between Fe²⁺ and Fe³⁺ is:

A) Benedict’s test B) Flame test C) Sodium hydroxide test D) Barium chloride test

Correct Answer: C) Sodium hydroxide test

What is a property shared by all transition metals?

A) Lack of color B) Low melting point C) Formation of colored compounds D) Inability to form ions

Correct Answer: C) Formation of colored compounds

A reaction between sodium and sulfur produces:

A) Na₂S B) Na₂SO₄ C) NaS D) NaSO₃

Correct Answer: A) Na₂S

Which statement about Group I metals is correct?

A) They form divalent ions B) They are brittle C) Their reactivity increases down the group D) They are good oxidizing agents

Correct Answer: C) Their reactivity increases down the group