quiz 13 sec3

What is the nature of the aqueous solution of NaCN?

• Acidic

• Basic

• Neutral

• Amphoteric

………….solution turns methyl orange into yellow.

• Sodium chloride

• Ammonium chloride

• Sodium carbonate

• Ammonium carbonate

On the titration of ……………, pH value of the produced solution becomes higher than 7

• weak acid with weak base

• strong acid with weak base

• weak acid with strong base

• strong acid with strong base

What is type of the solution produced from mixing 0.1 mol of NaOH with 0.1 mol of acetic acid, where they both have the same concentration?

• An acidic solution

• A basic solution

• A neutral solution

• A solution that does not contain free OH^– ions

Which of the following solutions has lower pH? ……………

• NaOH

• NH₄Cl

• Na₂CO₃

• NaCl

What is the pH value of the aqueous solution resulting from adding 0.085 mol of NaOH to 1 L of 0.075 M HCl?

• 2

• 7

• 12

• 12.78

The correct order of pOH value for solutions is:

• KCN < HCN < KOH

• KOH < KCN < HCN

• HCN < KOH < KCN

• HCN < KCN < KOH

On burning a black powder in air, a gas is formed which dissolves in water forming solution (X) whose pH is close to 7, this gas is also soluble in sodium hydroxide, what is the type od the solution (X)? ……………

• Strong acid.

• Strong base.

• Weak acid

• Weak base

Pure water is a weak electrolyte. Which of the following substances when a small amount of it dissolves in water, it leads to increasing the intensity of the conducted electric current?

• Table salt

• Table sugar

• Acetone

• Oxygen

Which one of the following represents the higher concentration in the acetic acid solution?

• Concentration of hydronium

• Concentration of acid molecules

• Concentration of hydroxyl ions

• Concentration of acetate ions