Hydrated Salts

Q.

Question 25.
Match the chemical substances given in Column I with their appropriate application given in Column II.

(a) A - (2) B - (1) C - (4) D - (3)
(b) A - (3) B - (2) C - (4) D - (1)
(c) A - (3) B - (4) C - (1) D - (2)
(a) A - (2) B - (4) C - (1) D - (3)

Q.

What is the equation for Calcium Carbonate?

Q.

Name a salt blue in color but becomes white upon strong heating.

Q.

Which of the following numbers represents the water of crystallization of blue vitriol?

1. 2

2. 4

3. 5

4. 7

Q.

Permutit is the name given to:

1. Aluminium of calcium and sodium

2. Hydrated silicate of aluminium and sodium

3. Silicates of calcium and magnesium

4. Silicates of calcium and sodium

Q.

How do you test for blood clotting disorders?

Q. Slide the number of water molecules present in washing soda.

1. 10

Q.

(i) Carbonate of metal $‘X’$is abundant in earth crust and its hydroxide is used in ‘white washing’. Identify metal $‘X’$.

(ii) How will you convert this carbonate into oxide? Name the process and write its equation.

Q. Question 30.
Identify the correct representation of reaction occurring during chloralkali process.
(a) $2\text{NaCl(l)}+2{\text{H}}_2\text{O(l)}\to 2\text{NaOH(l)}+{\text{Cl}}_2\text{(g)}+{\text{H}}_2\text{(g)}$
(b) $2\text{NaCl(aq)}+2{\text{H}}_2\text{O(aq)}\to 2\text{NaOH(aq)}+{\text{Cl}}_2\text{(g)}+{\text{H}}_2\text{(g)}$
(c) $2\text{NaCl(aq)}+2{\text{H}}_2\text{O(l)}\to 2\text{NaOH(aq)}+{\text{Cl}}_2\text{(aq)}+{\text{H}}_2\text{(aq)}$
(d) $2\text{NaCl(aq)}+2{\text{H}}_2\text{O(l)}\to 2\text{NaOH(aq)}+{\text{Cl}}_2\text{(g)}+{\text{H}}_2\text{(g)}$

Q.

How do you use Alum ?

Q. The aqueous solution of potash alum $[K_{2}S{O}_4.A{l}_2(S{O}_4{)}_3.24H_{2}O]$ is acidic due to:

1. hydrolysis of $S{O}_4^{2-}$
2. presence of acid in its crystal as impurity
3. hydrolysis of $A{l}^{3+}$
4. hydrolysis of $K^{+}$

Q.

Why is it called Potash?

Q.

Write the formulae of the following compound:

• Potassium carbonate

Q. Potash alum removes impurities from water by coagulation of impurities.

1. True
2. False

Q. Blue colored X changes to white colored Y on heating and in the presence of the moisture Y gives blue colored X. What is X likely to be?

1. X is the bleaching powder
2. X has some water of crystallization
3. X is NaCl
4. X has some organic contents

Q. What are the uses of potash alum?

1. Purification of impure water
2. Used for catalysis
3. Used for stopping bleeding
4. Used in dyeing industry

Q.

Which chlorides does $\mathrm{Li}$ and $\mathrm{Mg}$ form?

Q. Which of the following salts does not contain water of crystallisation?

Q.

Match the following.

Relate physical states used in Chemical reaction to their symbols.

$\begin{array}{cc}\text{Physical State}& \text{Symbol}\\ 1.\text{Gas}& \left(A\right)\left(dw\right)\\ 2.\text{Solid}& \left(B\right)\left(g\right)\\ 3.\text{Liquid}& \left(C\right)\left(aq\right)\\ 4.\text{Dissolved in water(solution with water)}& \left(D\right)\left(l\right)\\ & \left(E\right)\left(s\right)\\ & \left(F\right)\left(v\right)\end{array}$

1. B, E, D, C

2. B, D, E, C

3. C, D, E, B

4. E, B, C, D

Q. _____ is the chemical formula of Glauber's salt.

1. ${\text{Na}}_2{\text{SO}}_4.10{\text{H}}_2\text{O}$
2. ${\text{Na}}_2{\text{CO}}_3.10{\text{H}}_2\text{O}$
3. $\text{Ba}{\text{Cl}}_2.2{\text{H}}_2\text{O}$
4. ${\text{MgSO}}_4.7{\text{H}}_2\text{O}$

Q.

Explain any two types of dyes based on their method of application.

Q. If compound X is ${\text{CuSO}}_4.5{\text{H}}_2\text{O}$, how many water molecules are present in one formula unit of X?

1. Ten
2. Four
3. One
4. Five

Q. The chemical used to remove organic particles from leather is ___ .

Q.

Name the compounds of calcium which are used in making washing soda.

Q. When ${\text{CuSO}}_4.5{\text{H}}_2\text{O}$ is heated, the products formed are:

1. $CuS{O}_4.3H_{2}OandC{O}_2$
2. $CuS{O}_{4}and5H_{2}O$
3. $CuS{O}_4.10H_{2}Oand5H_{2}O$
4. $Cu(OH{)}_{2}and{H}_{2}S{O}_4$

Q.

Which of the following salts are not hydrated salts?

1. Washing soda

2. Baking soda

3. Blue vitriol

4. Glauber's salt

Q. why do ZnO is white at room temperature but turns yellow on heating ? give a detailed explanation .

Q. Hydrated salts are widely used in skin care products.

1. False
2. True

Q. Salts lose their water of crystallisation upon heating.

1. True
2. False

Q. Burst the bubble that contains a salt having water of crystallisation.

1. Caustic soda
2. Gypsum
3. Plaster of Paris
4. Washing soda
5. Baking soda
6. Blue vitriol
7. Green vitriol
8. Caustic potash