Default Title

Question (31)

QN0035902

NaCl and KCl belong to the same family because they have the same:

(A) Sodium ion
(B) Potassium ion
(C) Chloride ion
(D) Sulphate ion

Correct Answer: C

Explanation:

Both contain the chloride radical, so they belong to the chloride salt family.

Link:

Report Error

Question (32)

QN0035903

During electrolysis of brine, 2NaCl + 2H2O → 2NaOH + Cl2 + H2. If 4 formula units of NaCl participate, how many H2 molecules are represented?

(A) 1
(B) 2
(C) 4
(D) 8

Correct Answer: B

Explanation:

The equation shows a 2:1 ratio of NaCl to H2, so 4 NaCl corresponds to 2 H2.

Link:

Report Error

Question (33)

QN0035904

In the chlor-alkali process, chlorine gas is released at the:

(A) Cathode
(B) Anode
(C) Salt bridge
(D) Bottom of the container only

Correct Answer: B

Explanation:

Chlorine is given off at the anode and hydrogen at the cathode.

Link:

Report Error

Question (34)

QN0035905

If the chlor-alkali process produces chlorine and hydrogen gases along with NaOH, which raw material is being electrolysed?

(A) Solid NaOH
(B) Aqueous sodium chloride (brine)
(C) Calcium carbonate
(D) Sodium carbonate crystals

Correct Answer: B

Explanation:

The chlor-alkali process uses an aqueous solution of sodium chloride called brine.

Link:

Report Error

Question (35)

QN0035906

Chlorine reacts with dry slaked lime to produce a substance represented in the chapter as Ca(ClO)2. What is its common name?

(A) Washing soda
(B) Baking soda
(C) Bleaching powder
(D) Plaster of Paris

Correct Answer: C

Explanation:

Bleaching powder is represented as Ca(ClO)2 in the chapter.

Link:

Report Error

Question (36)

QN0035907

A chemical is required to disinfect drinking water and is also used for bleaching materials. Which substance from the chapter fits both requirements?

(A) Bleaching powder
(B) Washing soda
(C) Plaster of Paris
(D) Sodium chloride

Correct Answer: A

Explanation:

Bleaching powder is used for bleaching and for making drinking water free from germs.

Link:

Report Error

Question (37)

QN0035908

Baking soda is heated according to 2NaHCO3 → Na2CO3 + H2O + CO2. If 2 units of NaHCO3 are heated, how many CO2 molecules are represented?

(A) 0
(B) 1
(C) 2
(D) 4

Correct Answer: B

Explanation:

The balanced equation has one CO2 for every two NaHCO3 units.

Link:

Report Error

Question (38)

QN0035909

A baker adds baking powder to a mixture. The product of the reaction causes the dough to rise. Which gas is responsible?

(A) H2
(B) O2
(C) CO2
(D) Cl2

Correct Answer: C

Explanation:

CO2 produced when baking powder reacts helps bread or cake rise and become soft and spongy.

Link:

Report Error

Question (39)

QN0035910

A patient needs a mild basic substance to neutralise excess stomach acid. Which compound from the chapter can serve this purpose?

(A) NaHCO3
(B) HCl
(C) CH3COOH
(D) H2SO4

Correct Answer: A

Explanation:

Sodium hydrogencarbonate is a mild, non-corrosive basic salt and is an ingredient in antacids.

Link:

Report Error

Question (40)

QN0035911

A substance is required to remove permanent hardness of water. Which compound from the chapter is suitable?

(A) Sodium chloride
(B) Sodium carbonate
(C) Sodium hydrogencarbonate
(D) Hydrochloric acid

Correct Answer: B

Explanation:

Sodium carbonate (washing soda) is used for removing permanent hardness of water.

Link:

Report Error

Question (31)

NaCl and KCl belong to the same family because they have the same:

Explanation:

Link:

Question (32)

During electrolysis of brine, 2NaCl + 2H2O → 2NaOH + Cl2 + H2. If 4 formula units of NaCl participate, how many H2 molecules are represented?

Explanation:

Link:

Question (33)

In the chlor-alkali process, chlorine gas is released at the:

Explanation:

Link:

Question (34)

If the chlor-alkali process produces chlorine and hydrogen gases along with NaOH, which raw material is being electrolysed?

Explanation:

Link:

Question (35)

Chlorine reacts with dry slaked lime to produce a substance represented in the chapter as Ca(ClO)2. What is its common name?

Explanation:

Link:

Question (36)

A chemical is required to disinfect drinking water and is also used for bleaching materials. Which substance from the chapter fits both requirements?

Explanation:

Link:

Question (37)

Baking soda is heated according to 2NaHCO3 → Na2CO3 + H2O + CO2. If 2 units of NaHCO3 are heated, how many CO2 molecules are represented?

Explanation:

Link:

Question (38)

A baker adds baking powder to a mixture. The product of the reaction causes the dough to rise. Which gas is responsible?

Explanation:

Link:

Question (39)

A patient needs a mild basic substance to neutralise excess stomach acid. Which compound from the chapter can serve this purpose?

Explanation:

Link:

Question (40)

A substance is required to remove permanent hardness of water. Which compound from the chapter is suitable?

Explanation:

Link:

Excel With Tutors

ExcelWithTutors

For Student

For Tutors

Learn

OUR POLICY