Which formula represents a hydroxide of an alkali metal?

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Multiple Choice

Which formula represents a hydroxide of an alkali metal?

Explanation:
Alkali metals form hydroxides with the simple formula MOH when they react with water, where the metal is from Group 1. LiOH fits this pattern because lithium (an alkali metal) combines with hydroxide to give lithium hydroxide. The other options don’t match: Ca(OH)2 is a hydroxide but of calcium, an alkaline earth metal (Group 2), Zn(NO3)2 is a zinc salt (not a hydroxide), and NH4Cl is a salt containing ammonium, not a hydroxide.

Alkali metals form hydroxides with the simple formula MOH when they react with water, where the metal is from Group 1. LiOH fits this pattern because lithium (an alkali metal) combines with hydroxide to give lithium hydroxide. The other options don’t match: Ca(OH)2 is a hydroxide but of calcium, an alkaline earth metal (Group 2), Zn(NO3)2 is a zinc salt (not a hydroxide), and NH4Cl is a salt containing ammonium, not a hydroxide.

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