If a sodium hydroxide solution were added to a solution containing lead(ii) ions, sodium ions, nickel(ii) ions, and potassium ions then the ion which would remain in the supernatant are potassium ions and sodium ions
Supernatant means clear liquid overlying material deposited by settling, precipitation and centrifugation called as supernatant. so here in the solution of sodium hydroxide means in naoh solution added lead(ii) ions, sodium ions, nickel(ii) ions, and potassium ions in that solution potassium ions and sodium ions are deposited by settling down and making precipitation that's why in this solution of naoh potassium ions and sodium ions are remain in the supernatant.
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