Sec 3NA Revision_Acids, Bases and Salts

Which of the following is used to neutralise excess acid in the soil?

• ammonium sulfate

• calcium hydroxide

• magnesium nitrate

• sodium hydroxide

Which element forms an oxide that reacts with both acid and alkali?

• aluminium

• calcium

• copper

• magnesium

When sodium hydroxide is warmed with salt S, a gas is produced which turns damp red litmus paper blue. Which of the following could be salt S?

• zinc carbonate

• ammonium chloride

• calcium chloride

• aluminium nitrate

Which gas forms a white precipitate with limewater?

• carbon monoxide

• carbon dioxide

• ammonia

• hydrogen

Which gas extinguishes a lighted splint with a pop sound?

• oxygen

• hydrogen

• carbon dioxide

• ammonia

Which gas turns damp red litmus paper blue?

• hydrogen

• carbon dioxide

• ammonia

• oxygen

Four solutions have the following pH values.

Which pair of solutions is certain to produce an alkaline solution when mixed together?

• W and X

• X and Y

• Y and Z

• W and Z

Which of the following is a salt?

• sodium chloride

• hydrochloric acid

• sodium hydroxide

• sodium oxide

Which of the following is a base?

• magnesium chloride

• magnesium sulfate

• magnesium oxide

• magnesium nitrate

Which of the following is the correct chemical formula for hydrochloric acid?

• HCl

• H₂Cl

• HCl₂

• H₂Cl₂