Drying and Dehydrating Agents

Q.

What is the difference between Washing soda and soda ash?

Q.

What is drying or desiccating agents? Give examples.

Q.

_______ are substances that can absorb moisture from other substances without chemically reacting with them.

1. Drying agents

2. Efflorescent substance

3. Deliquescence substance

4. Desiccating agents

Q.

Complete the following table :

Common Name	Chemical Name	Formula	Acid, base, or salt	Efflorescent, hygroscopic or deliquescent substance
Solid caustic potash
Quick lime
Oil of vitriol
Washing soda
Solid caustic soda
Blue vitriol

Q.

Which of the following can remove chemically combined water molecules from compounds?

1. Dehydrating substance
2. Deliquescence substances
3. Drying agents

4. Hydroscopic substances

Q.

What are drying or desiccating agents. Give examples.

Q.

Certain substances that remove moisture from other substances are called_______ agents.

Q. Sodium carbonate is known by the common name of .

1. washing soda
2. baking soda
3. caustic soda

Q.

Which one of the following is used in the whitewashing of walls?

1. Calcium oxide mixed with water

2. Calcium carbonate mixed with water

3. Cadmium sulfate mixed with water

4. Sodium chloride mixed with water

Q. Green vitriol is the common name of .

1. $FeS{O}_4$
2. $CuS{O}_4$
3. $ZnS{O}_4$

Q.

Identify the substances P, Q, R, S, and T in each case based on the information below:

The white crystalline solid is Q is soluble in water. It liberates a pungent-smelling gas when heated with sodium hydroxide solution.

Q. Sodium carbonate is known by the common name of .

1. caustic soda
2. baking soda
3. washing soda

Q. Which of the following statement(s) is/are correct with reference to $F{e}^{2+}$ and $F{e}^{3+}$ ions ?

1. 1, 2
2. 1, 4
3. 1, 2, 3
4. All of these

Q. Green vitriol is the common name of .

1. $FeS{O}_4$
2. $CuS{O}_4$
3. $ZnS{O}_4$

Q. Which one of the following substances is used in the laboratory for a fast drying of neutral gases?

1. Anhydrous calcium chloride
2. $N{a}_{3}P{O}_4$
3. Active charcoal
4. Phosphorus pentoxide

Q. Which of the following is soluble in alcohol?

1. NaCl

2. NaOH

3. Na₂SO₄

4. Na₂CO₃

Q. Sodium carbonate is known by the common name of .

1. washing soda
2. baking soda
3. caustic soda

Q.

What do you mean by drying or desiccating agents

Q. Sodium carbonate is known by the common name of .

1. washing soda
2. baking soda
3. caustic soda

Q.

Which of the following is not a drying agent?

1. $Conc.H_{2}S{O}_4$
2. $CaO$
3. $P_2{O}_5$
4. None of the above

Q.

What is the difference between drying and dehydrating agents

Q. Sodium carbonate is known by the common name of .

1. washing soda
2. baking soda
3. caustic soda

Q.

Which of the following can remove chemically combined water molecules from compounds?

1. Dehydrating substance
2. Deliquescence substances

3. Hydroscopic substances

4. Drying agents

Q. Green vitriol is the common name of .

1. $FeS{O}_4$
2. $CuS{O}_4$
3. $ZnS{O}_4$

Q. State the methods by which hydrated salts can be made anhydrous.

Q. Which of the following is the dehydrating agent in the given reaction:

1. Carbon
2. Glucose
3. Concentrated sulphuric acid
4. Water

Q. Which of the following substance is used as dehydrating agent in laboratory?

1. Sodium carbonate
2. Potassium nitrate
3. Calcium chloride
4. Sodium chloride

Q. Most of the _____________ substance are drying agent.

1. Anhydrous substance
2. Hydrated substance
3. Hygroscopic substance
4. Efflorescent

Q. A substance which removes water from material is called:

1. dehydrating agent
2. hygroscopic
3. deliquescent
4. efflorescent

Q. From the recorded data:
Weight of U-tube $=20.36$g
Weight of U-tube and calcium chloride before $=39.32$g
Weight of U-tube and calcium chloride after $=57.32$g
Weight of boat and contents(copper oxide)before $=30.23$g
Weight of boat and contents after $=14.23$g
Weight of boat $=5.00$g
Determine the ratio of the mass of water formed to the mass of hydrogen used in the formation of water?

1. $1:8$
2. $1:9$
3. $8:1$
4. $8:9$
5. $9:1$