Acids, bases and salts

Front

An example of an acidic oxide is: MgO, CO₂, BaO, Na₂O

Back

CO₂

Front

Compound X was added to water, resulting in a pH < 7 and effervescence with calcium carbonate. What could compound X be?

Back

HNO₃

Front

A solution was added to some ammonium chloride then heated. A gas with a pungent smell that turned moist red litmus blue was produced. What could have been present in the original solution?

Back

potassium hydroxide

Front

Sequence for synthesizing lead iodide from the following steps: 1. Mix lead nitrate and potassium iodide 2. Dry 3. Filter 4. Mix lead sulphate and potassium iodide

Back

1, 3, 2

Front

A salt was being prepared by adding an acid to a carbonate. However, after a while, the reaction ceased and a precipitate began to form without all of the carbonate reacting. Which of the following pairs of acid and carbonate? Options: CaCO₃, H₂SO₄; CuCO₃, HCl; BaCO₃, HNO₃; Na₂CO₃, H₂SO₄

Back

CaCO₃, H₂SO₄

Front

Sodium hydroxide was added to a solution and a white precipitate formed, then dissolved in excess. Aqueous ammonia formed a white precipitate that did not dissolve. Which ion could be present? Options: Fe²⁺, Al³⁺, Zn²⁺, Ca²⁺

Back

Al³⁺

Front

What is the best way of making zinc carbonate?

Back

Shake solid zinc sulphate with water and add aqueous sodium carbonate

Front

Which property does hydrochloric acid have?

Back

It reacts with any base to give a salt

Front

Aqueous ammonia was added to a solution of a salt. A blue precipitate was formed which dissolved to give a deep blue solution in excess ammonia. Which ion could be present? Options: Cu²⁺, Fe²⁺, Pb²⁺, Fe³⁺

Back

Cu²⁺

Front

What is the best description of a salt?

Back

Forms when all or part of the hydrogen ions in an acid is replaced.