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The MCQs below are drawn from the Chemistry subject category.
Showing 3081–3090
of 4341 MCQs
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3081
Which theoretical framework describes chemical bonding as the result of valence electrons being either shared between atoms or transferred from one atom to another?
The electronic theory of chemical bonding, often associated with the Lewis octet rule, posits that atoms bond by transferring electrons (forming ionic bonds) or sharing electrons (forming covalent bonds) to achieve a stable electronic configuration, typically resembling that of a noble gas.
3082
What type of bond holds hydrogen and oxygen atoms together in a water molecule?
In a water molecule, hydrogen and oxygen atoms are bonded together through a covalent bond, which is a chemical bond formed by sharing electrons between atoms.
3083
Which one of the following has polar covalent bond ?
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3084
What substance exhibits the most robust bonding when in its solid form?
Sodium chloride (NaCl) forms an ionic bond, characterized by the electrostatic attraction between positively and negatively charged ions. This strong electrostatic interaction results in a high melting and boiling point, indicating strong bonding in the solid state.
3085
What characteristic is typical of covalent network crystals?
Covalent network crystals are characterized by a strong and rigid three-dimensional network of covalent bonds, resulting in higher melting points compared to molecular crystals, which are held together by weaker intermolecular forces.
Copper is a metal that primarily exhibits ionic bonds, unlike the other options, which are all made up of covalent bonds. Ice is a form of water, diamond is pure carbon, and graphite is also pure carbon, all of which contain covalent bonds.
3087
What is the primary type of compound formed between nitrogen and phosphorus?
Nitrogen and phosphorus tend to form covalent bonds due to their similar electronegativities, resulting in compounds such as ammonia (NH3) and phosphine (PH3). This is in contrast to ionic compounds, which typically form between metals and nonmetals with large electronegativity differences.
Ethylene diammine is a bidentate ligand as it has two donor atoms that can bind to a central metal atom, forming two coordinate covalent bonds. This allows it to occupy two coordination sites.
Ionic bonds occur when one atom loses an electron to become a positively charged ion (cation), and another atom gains an electron to become a negatively charged ion (anion). Sharing of electrons is not a characteristic of ionic bonds, as it is more typical of covalent bonds.
3090
Which hydroxide is the least ionic and decomposes when heated?
LiOH is the least ionic due to the small size of Li+, resulting in higher covalent character. It decomposes into Li2O when heated, unlike other alkali metal hydroxides which are more ionic and stable.
