Daily-Life Salts II: Baking Soda, Washing Soda and Plaster of Paris

Section A: Baking Soda and Washing Soda

Question 1mcq

Baking soda is:

A.

NaCl

B.

Na_2CO_3 \cdot 10H_2O

C.

CaOCl_2

D.

NaHCO_3

Question 2mcq

Baking soda helps cakes rise because it releases:

A.

Cl_2

B.

O_2

C.

H_2

D.

CO_2

Question 3mcq

Baking soda can act as an antacid because it is:

A.A neutral gas

B.Mildly basic

C.Strongly acidic

D.A metal

Question 4mcq

Washing soda is:

A.

NaHCO_3

B.

Na_2CO_3 \cdot 10H_2O

C.

CaOCl_2

D.

CaSO_4 \cdot rac{1}{2}H_2O

Question 5mcq

Washing soda is used for:

A.Making curd

B.Testing hydrogen

C.Preparing oxygen

D.Softening hard water

Question 6mcq

Which pair is correctly matched?

A.Baking soda —

NaHCO_3

; Washing soda —

Na_2CO_3 \cdot 10H_2O

B.Baking soda —

NaOH

; Washing soda —

H_2SO_4

C.Baking soda —

NaCl

; Washing soda —

HCl

D.Baking soda —

CaOCl_2

; Washing soda —

CaSO_4

Section B: Plaster of Paris

Question 7mcq

Plaster of Paris has the formula:

A.

NaHCO_3

B.

CaSO_4 \cdot 2H_2O

C.

CaSO_4 \cdot rac{1}{2}H_2O

D.

CaOCl_2

Question 8mcq

Gypsum is:

A.

Na_2CO_3

B.

NaCl

C.

CaSO_4 \cdot rac{1}{2}H_2O

D.

CaSO_4 \cdot 2H_2O

Question 9mcq

Plaster of Paris sets into a hard mass when mixed with:

A.Water

B.Dry salt

C.Chlorine gas

D.Hydrogen gas

Question 10mcq

Why is POP stored in moisture-proof containers?

A.It turns into baking soda

B.It evaporates quickly

C.It becomes chlorine

D.It reacts with moisture and sets hard

Question 11mcq

A common use of plaster of Paris is:

A.Disinfecting water

B.Making soap directly

C.Neutralising stomach acid

D.Making casts for fractured bones

Question 12mcq

POP is prepared by heating gypsum at about:

A.

273\ K

B.

1000\ K

C.

573\ K

D.

373\ K