The state of matter with the lowest density is gas, as its molecules are widely spaced, resulting in a lower mass per unit volume compared to liquids and solids.

XeOF4 is a compound of Xenon in which the oxidation state of Xenon is +6. This is due to the presence of fluorine and oxygen atoms, which contribute to the overall oxidation state of Xenon.

Metals are typically insoluble in both polar and non-polar solvents, but can dissolve in their own molten state, known as fused metal.

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Butyric acid is a short-chain saturated fatty acid that is known for its strong, unpleasant odor, often described as rancid, sour, or pungent.

Palmitic acid is a saturated fatty acid with a 16-carbon chain. Its chemical formula is C15H31COOH, which corresponds to a carboxylic acid group attached to a 15-carbon hydrocarbon chain.

Polymers are formed from the combination of small repeating units, known as monomers. These monomers bond together through chemical reactions to create the polymer chain.

Alkanes are a type of aliphatic hydrocarbons characterized by single covalent bonds between carbon atoms in their chain, also known as saturated hydrocarbons.

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Linear polymers have their monomer units linked in a straight chain. High density polythene and PVC are examples of linear polymers, whereas low density polythene is a branched polymer. Therefore, both A and C are correct examples of linear polymers.