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5/75 MCQs for:
MATTER - PROPERTIES AND TRANSFORMATION: Chemistry Of Elements - Identification Of Ions
When an unknown solution is mixed with dilute hydrochloric acid, a gas is evolved which turns a filter paper dipped in lead(II) ethanoate solution black. Which anion is indicated?
What colour precipitate is formed when sodium hydroxide solution is added to a solution containing copper(II) ions?

When sodium hydroxide solution is added drop wise to a test solution, and then in excess, a reddish-brown gelatinous precipitate which is insoluble in excess sodium hydroxide indicates the presence of?

When an unknown solution is warmed with sodium hydroxide, a gas is evolved that turns damp red litmus paper blue. Which cation is likely present?
What colour flame is observed when a small amount of a sodium compound is introduced into a Bunsen flame?