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16.) An acid which dissociates completely or almost completely in water are called strong acids. For example: HCl, H2SO4.
An acid which dissociates only partially when dissolved in water are called weak acids. For example: CH3COOH, HCOOH.
17.) When HCl react with metals, it produce hydrogen gas. When a match stick lightened place near hydrogen gas puts out with a pop sound.
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