Carbon and Its Allotropes

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Questions and Answers

What is the chemical formula for the compound used as baking soda?

Na₂CO₃
CO₂
CaCO₃
NaHCO₃ (correct)

What is the chemical formula for the compound used in limewater?

CaCO₃ (correct)
CO₂
NaHCO₃
Na₂CO₃

What is the chemical reaction that takes place when carbon dioxide is passed through an aqueous solution of sodium hydroxide?

2NaOH + CO₂ → Na₂CO₃ + H₂O (correct)
Na₂CO₃ + H₂O + CO₂ → 2NaHCO₃
CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂
2NaHCO₃ → Na₂CO₃ + CO₂ + H₂O

Based on its interaction with limewater, which chemical property of carbon dioxide is being observed?

Reactivity (C) Signup and view all the answers

Which of the following is NOT a use of carbon dioxide?

Used to make explosives (B) Signup and view all the answers

What is the chemical reaction that occurs when carbon dioxide is passed through an aqueous solution of sodium carbonate?

Na₂CO₃ + H₂O + CO₂ → 2NaHCO₃ (B) Signup and view all the answers

The observation that carbon dioxide turns blue litmus paper red indicates what property of carbon dioxide?

Acidity (B) Signup and view all the answers

What is the chemical formula for the gas that is produced when dilute hydrochloric acid reacts with calcium carbonate?

CO₂ (C) Signup and view all the answers

What method is used to collect the carbon dioxide gas in the experiment described?

Upward displacement of air (B) Signup and view all the answers

What property of carbon dioxide makes it suitable for being used in fire extinguishers?

Acidity (B) Signup and view all the answers

What is the main reason why coke is used as a reducing agent?

Coke can react with metal oxides to remove oxygen and form carbon dioxide. (A) Signup and view all the answers

What is the primary difference between saturated and unsaturated hydrocarbons?

Saturated hydrocarbons contain only single bonds between carbon atoms, while unsaturated hydrocarbons have at least one double or triple bond. (A) Signup and view all the answers

Which of the following is a saturated hydrocarbon?

Ethane (CH₃—CH₃) (A), Propane (CH₃—CH₂—CH₃) (B) Signup and view all the answers

Based on its electronic configuration, what is the maximum number of covalent bonds a carbon atom can form?

4 (A) Signup and view all the answers

What is the name of the compound formed by sharing one electron each with four hydrogen atoms by a carbon atom?

Methane (CH₄) (B) Signup and view all the answers

Charcoal, a form of carbon produced from plants, has a significant application in which of the following?

Purification of water and organic material. (C) Signup and view all the answers

What is the primary reason for the strong and stable nature of a single bond between two carbon atoms?

The equal sharing of electrons between the two carbon atoms. (B) Signup and view all the answers

Which of the following is NOT an application of coke?

Production of synthetic diamonds. (E) Signup and view all the answers

What type of bond is formed when a carbon atom shares an electron with a hydrogen atom?

Covalent bond (A) Signup and view all the answers

What chemical reaction occurs when sodium bicarbonate and sulphuric acid are mixed in a fire extinguisher?

2NaHCO3 + H₂SO₄ → Na₂SO₄ + 2 H2O + 2 CO₂↑ (C) Signup and view all the answers

Why are CO₂ fire extinguishers preferred for electrical fires?

They do not cause corrosion and are non-conductors of electricity. (B) Signup and view all the answers

Which statement is true regarding the properties of methane?

Methane has a boiling point of -161.5 °C. (B) Signup and view all the answers

What is produced when methane reacts with chlorine in the presence of ultraviolet light?

Methyl chloride and hydrogen chloride (B) Signup and view all the answers

Which of the following best describes the condition under which methane is formed from a mixture of hydrogen and carbon monoxide?

At 300 °C in the presence of a nickel catalyst (D) Signup and view all the answers

What is the name of the carbon allotrope that is shaped like a soccer ball?

Fullerene (B) Signup and view all the answers

Which type of coal has the highest carbon content?

Anthracite (C) Signup and view all the answers

What is the name of the carbon allotrope that is shaped like a tube?

Buckytube (B) Signup and view all the answers

Which of these are NOT properties of fullerene?

They have a very high melting point. (C) Signup and view all the answers

Which of the following are NOT an example of fullerene?

C90 (B) Signup and view all the answers

What is the first step in the formation of coal?

Formation of Peat (C) Signup and view all the answers

What is the name of the carbon allotrope used as a catalyst in water purification?

Fullerene (C) Signup and view all the answers

Which of the following statements correctly describes the arrangement of carbon atoms in graphite?

Carbon atoms are arranged in layers that can slide over each other. (A) Signup and view all the answers

What is the MAIN difference between graphite and fullerene?

Their structural arrangement. (B) Signup and view all the answers

What is the main element present in substances derived from plants and animals?

Carbon (A) Signup and view all the answers

Which of the following is NOT considered an organic compound?

Water (A) Signup and view all the answers

What is the Latin word from which the name 'carbon' is derived?

Carbo (B) Signup and view all the answers

Which of the following is an example of a free state of carbon?

Diamond (A) Signup and view all the answers

What does the black substance remaining in test tubes after heating substances like sugar, wool, and dry leaves indicate?

The presence of carbon (C) Signup and view all the answers

What is the chemical equation for the synthesis of urea from ammonium cyanate?

$NH_4^+CNO \xrightarrow{Heat} NH_2CONH_2$ (A) Signup and view all the answers

What is the primary reason why organic chemistry is also referred to as the chemistry of carbon compounds?

Carbon forms strong bonds with itself and other elements, leading to a vast diversity of compounds. (D) Signup and view all the answers

Flashcards

Element

A basic substance that cannot be broken down into simpler substances.

Carbon

A non-metallic element essential in organic compounds, present in free and combined forms.