Acids, Bases and Salts
NIOS · Class 10 · Science & Tech
Flashcards for Acids, Bases and Salts — NIOS Class 10 Science & Tech. Quick Q&A cards covering key concepts, definitions, and formulas.
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See them allWhat is an acid according to Arrhenius?
Answer
An acid is a substance which furnishes hydrogen ions (H+) when dissolved in water. Acids turn blue litmus red and can conduct electricity in aqueous solution.
What is a base according to Arrhenius?
Answer
A base is a substance which furnishes hydroxide ions (OH-) when dissolved in water. Bases turn red litmus blue and can conduct electricity in aqueous solution.
Why do acids and bases show their properties only in water?
Answer
Water helps acids and bases dissociate into ions. Dry HCl gas does not change dry blue litmus, and dry solid NaOH does not show basic nature until it absorbs moisture. So water is needed for free ions…
What happens when an acid reacts with a metal?
Answer
Acid + Metal → Salt + Hydrogen gas. Hydrogen gas can be confirmed by the pop sound when a burning matchstick is brought near it. Example: Zn + H2SO4 → ZnSO4 + H2.
What happens when acids react with metal carbonates or metal hydrogen carbonates?
Answer
Acid + metal carbonate or hydrogen carbonate → Salt + Water + Carbon dioxide. The carbon dioxide turns lime water milky. Excess carbon dioxide makes the milkiness disappear due to soluble calcium hydr…
Why does lime water first turn milky and then clear on passing extra carbon dioxide?
Answer
Carbon dioxide reacts with lime water to form white calcium carbonate, which makes it milky. When excess carbon dioxide is passed, the calcium carbonate changes into soluble calcium hydrogen carbonate…
What happens when an acid reacts with a metal oxide?
Answer
Metal oxide + Acid → Salt + Water. Example: CuO + 2HCl → CuCl2 + H2O. The black copper oxide dissolves and the solution becomes bluish green.
What is neutralization?
Answer
Neutralization is the reaction of an acid with a base to form salt and water. Example: HCl + NaOH → NaCl + H2O. This reaction reduces acidic and basic properties.
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