Molten sodium burns with brilliant yellow flame in a chlorine atmosphere to form _ ?
Correct answer: A. NaCl
- A. NaCl
- B. NaOH
- C. NaBr
- D. ClO
Explanation
Option A: When molten sodium (Na) comes into contact with chlorine (Cl₂) gas, a vigorous reaction takes place, resulting in the formation of sodium chloride (NaCl). This reaction is highly exothermic and produces a brilliant yellow flame. Sodium chloride is a common salt and is the compound formed when sodium reacts with chlorine. Option B: Sodium hydroxide, also known as caustic soda, is not formed when molten sodium reacts with chlorine. Sodium hydroxide is typically produced through the electrolysis of sodium chloride (NaCl) solution. It is a strong base and has various industrial uses, including in the production of soaps, detergents, and paper. Option C: Sodium bromide is not formed when molten sodium reacts with chlorine. Sodium bromide is produced by the reaction of sodium hydroxide (NaOH) with hydrobromic acid (HBr) or by the direct combination of sodium and bromine. It is commonly used in photography, oil drilling, and as a sedative in medicine. Option D: Chlorine monoxide (ClO) is not formed when molten sodium reacts with chlorine. Chlorine monoxide is a radical molecule composed of one chlorine atom and one oxygen atom. It is highly reactive and participates in various atmospheric reactions, particularly in the depletion of ozone (O₃) in the stratosphere.
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About Reactions of Group I Elements
Group I elements have one valence electron, so their reactivity increases down the group as ionisation energy decreases. Their reactions with water, oxygen, hydrogen and halogens produce hydroxides, oxides, hydrides and halides, while the behaviour of lithium differs from the heavier metals because of its small ionic size.
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