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Chemistry: Non-metallic and Metallic Character

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Chemistry: Non-metallic and Metallic Character

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Questions and Answers

What is the molecular structure of diborane (B2H6)?

Trigonal planar

Bridged (correct)

Linear

Tetrahedral

What happens when borax is heated strongly?

It forms boric acid

It sublimes

It turns into a glass-like material

It decomposes to form sodium oxide and boron trioxide (correct)

What is the product when silicon is heated with methyl chloride at high temperature in the presence of copper?

Copper silicide

Silicon carbide

Silicon tetrachloride

Methyl silane (correct)

Why can concentrated nitric acid be transported in aluminum containers?

Aluminum forms a thin, protective oxide layer that prevents further reaction Signup and view all the answers

Why does graphite have a lower melting point compared to diamond?

Graphite has a layered structure with weaker intermolecular forces Signup and view all the answers

Why is aluminium alloy used to make aircraft bodies?

Aluminium alloy is lightweight and corrosion-resistant Signup and view all the answers

Why is there a significant decrease in ionization enthalpy from carbon to silicon?

Silicon has a larger atomic radius compared to carbon Signup and view all the answers

What is the primary difference in the physical properties of diamond and graphite?

Diamond is harder than graphite Signup and view all the answers

Why should aluminum utensils not be kept in water overnight?

Aluminum forms a protective oxide layer that can be damaged by prolonged exposure to water Signup and view all the answers

What is the reason for the lower atomic radius of gallium compared to aluminum?

Gallium has a higher effective nuclear charge due to its higher atomic number Signup and view all the answers