Family of Salts

Q. When ${\text{NaHCO}}_3$ is heated , + ${\text{CO}}_2+{\text{H}}_2\text{O}$ is obtained.

1. ${\text{Na}}_2{\text{CO}}_3$
2. $\text{NaOH}$
3. ${\text{NaHCO}}_3$
4. $\text{NaCl}$

Q. Why does plaster of Paris have 1/2 molecule of water? Why does 2 CaSO4 molecules share one molecule of water?

Q.

An aqueous solution of sodium chloride is called:

1. Plaster of Paris

2. Brine

3. Baking soda

4. Washing soda

Q.

what is plaster of paris ? how is it obtained from gypsum ?

Q. How many water molecules are present in one formula unit of ${\text{CuSO}}_4.5{\text{H}}_2\text{O}$?

1. 5

Q. Why we call hemihydrated calcium sulphate as plaster of paris

Q.

Plaster of Paris is prepared by heating which of the following compounds?

1. Limestone

2. Lime

3. Soda ash

4. Gypsum

Q. Which compound is normally used as a drying agent for ammonia?

Q.

On heating gypsum at 373 K, we obtain:

1. Calcium sulphate hemihydrate

2. Baking soda

3. Washing soda

4. Calcium sulphate dihydrate

Q.

the difference of molecules of water in gypsum and pop is

Q.

which of the following is used to make toys

a) plaster of Paris b) gypsum c) bleaching powder d) calcium carbonate

Q. What can you say about the pH of a solution that liberates carbon dioxide from sodium carbonate?

Q.

Which of the following substances is used for supporting fractured bones?

1. Na₂SO₄

2. CaSO₄.₂H2O

3. CaSO₄

4. CaSO₄.1/2 H₂O

Q.

Give two examples of white-colored hydrated salts along with their chemical formula.

Q.

What is the commercial name of calcium sulphate hemihydrate ?

Q.

Importance of plaster of Paris with definition and with marks.

Q. Which of the following statements are true about sodium chloride?

1. It is a colourless salt.
2. It is formed from a neutralisation reaction.
3. It is used in the preparation of sodium carbonate.
4. It has pH value 6.

Q.

What are the strong bases?

Q. (i) What is the purpose of the pH scale?
(ii) What is the pH of pure water?
(iii) A is a soluble acidic oxide; B is a soluble base. Compared to the pH of pure water, what is the pH of
(a) a soluble of A?
(b) a solution of B?

Q.

Which of the following salt can be used as a cleaning agent for domestic purposes?

1. X = Na₂CO₃, Y = NH₄Cl and Z = Baking soda

2. X = NaOH, Y = H₂O and Z is washing soda

3. X = NaHCO₃, Y = NH₄Cl and Z = Na₂CO₃.10H₂O

4. X = NH₄Cl , Y = NaHCO₃ and Z = Washing soda

Q. Which one out of the given options is an example of a complex salt?

1. Zinc Sulphate
2. Sodium hydrogen sulfate
3. Iron(II) ammonium sulfate
4. Tetramine copper(II) sulfate

Q.

State true or false: bleaching powder is used for disinfecting drinking water.

1. True
2. False

Q.

Calcium sulphate hemihydrate is known as:

1. Soda ash

2. Plaster of Paris

3. Gypsum

4. Washing soda

Q.

Is the white cement and plaster of Paris the same?

Q.

Why calcium sulphate hemihydrate is called plaster of Paris?

Q.

Potash alum is an example of a:

1. Simple salt

2. Complex salt

3. Acid salt

4. Double salt

Q.

Explain about the plaster of Paris and useful of it and also give examples

Q. The chemical name of plaster of Paris is calcium sulphate dihydrate.

1. True
2. False

Q. Which of the following is not a salt?

1. Lead sulphide
2. Sodium chloride
3. Slaked lime
4. Zinc nitrate

Q. Identify the salt whose aqueous solution will have pH more than 7.

1. $K_{2}S{O}_4$
2. $K_{2}C{O}_3$
3. $NaCl$
4. $N{H}_{4}Cl$