Hydrated and Anhydrous Substances

Q.

What is the water of crystallization?

Q.

Give the characteristics of salts.

Q. What is meant by water of crystallization? Give examples of salts with water of crystallization and their uses.

Q.

Common salt can be purified by a process of?

Q.

What does one mean by water of crystallization?

Q.

Make a brief note about Nitrolium.

Q.

What are hydrated and unhydrated salts?

Q.

Explain the term water of crystallisation

Q.

When some amount of salt is dissolved in plenty of water, which statement is most likely to be correct about the resulting solution?

1. The solution becomes less concentrated on boiling for a long time

2. The boiling point of solution decreases on boiling for a long time

3. The boiling point of solution is lower than pure water

4. The boiling point of solution is higher than pure water

Q.

Give suitable chemical term for

A definite number of water molecules bound to some salts?

Q.

Assertion (A): Ammonia is a compound. ​
Reason (R): Ammonia is formed by the chemical combination of two elements which are nitrogen and hydrogen.​

Q.

Water of crystallization is the definite number of water molecules chemically combined with a salt in its crystalline form.

1. True
2. False

Q.

Differentiate between temporary and permanent hard water.

Q.

State your observations when following salts are heated strongly in dry state. Write chemical equations in support of your answer.

Ammonium dichromate $\left[{\left({\mathrm{NH}}_4\right)}_2{\mathrm{Cr}}_2{\mathrm{O}}_7\right]$

Q.

Choose the correct option regarding the uses of washing soda:

1. It is used to make the freezing mixture.

2. It is used as a fungicide.

3. It is used to manufacture glass.

4. It is used to manufacture cement.

Q.

Define water of crystallization. Give any three examples of hydrated salts along with their common names.

Q. Assertion :$CuS{O}_4.5H_{2}O$ has one hydrogen-bonded molecule of water. Reason: The four molecules of water are coordinated in $CuS{O}_4.5H_{2}O$.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. On heating 1.763g of hydrated $BaC{l}_2$ to dryness 1.505g of an hydrous salt remained. What is the formula of hydrate ?

1. $BaC{l}_2$$.H_{2}O$
2. $BaC{l}_2$$.3H_{2}O$
3. $BaC{l}_2$$.5H_{2}O$
4. $BaC{l}_2$$.2H_{2}O$

Q.

State your observations when following salts are heated strongly in dry state. Write chemical equations in support of your answer.

Copper nitrate hexahydrate $[\mathrm{Cu}{\left({\mathrm{NO}}_3\right)}_2.6{\mathrm{H}}_2\mathrm{O}]$

Q. The mass of BaCO3 produced when excess CO2 is bubbled through a solution of 0.205 mol Ba (OH)2 is

Q.

Which of the salt contain water of crystallization?

1. Potash alum

2. Plaster of paris

3. Epsom salt

4. All of these

Q.

Differentiate between temporary and permanent hard water.

Q. What is the formula for magnesium sulfate heptahydrate?

1. $MgS\cdot 7H_{2}O$
2. $Mg{\left({SO}_4\right)}_2\cdot 6H_{2}O$
3. $MgS\cdot 6H_{2}O$
4. $Mg{SO}_4\cdot 7H_{2}O$

Q. What is the difference between a hydrate and an anhydrate?

1. They are two separate and different compounds.
2. An anhydrate is a hydrate with the 'an' removed.
3. An anhydrate is a hydrate with the water removed.
4. A hydrate is an anhydrate with the water removed.
5. They are different words for the same thing.

Q. Which of the following is an example of hydrated substance?

1. Washing soda
2. Blue vitriol
3. Gypsum
4. All of the above

Q.

What do you mean by water of crystallization?

Q. Blue vitriol is an example of hydrated salt.

1. True
2. False

Q. Which of the following salts has no water of crystallization?

1. Washing soda
2. Blue vitriol
3. Baking soda
4. Gypsum

Q. The molecular formula of magnesium sulphide is

मैग्नीशियम सल्फाइड का अणुसूत्र है

1. Mg₂S
   
2. MgS
   
3. MgSO₄
   
4. Mg(SO₃)₂
   

Q. A salt which changes into liquid state on absorbing water from air is called hydrated salt.

1. true
2. false