Washing Soda

Q.

Write the chemical name of ${\mathrm{Na}}_2{\mathrm{CO}}_3·10{\mathrm{H}}_2\mathrm{O}$ and ${\mathrm{Na}}_2{\mathrm{CO}}_3$. Write the significance of $10{\mathrm{H}}_2\mathrm{O}$. Mention the term used for water molecules attached with salt. With the help of a chemical equation explain the method of preparation of both ${\mathrm{Na}}_2{\mathrm{CO}}_3·10{\mathrm{H}}_2\mathrm{O}$and ${\mathrm{Na}}_2{\mathrm{CO}}_3$. Also, enlist the uses of ${\mathrm{Na}}_2{\mathrm{CO}}_3·10{\mathrm{H}}_2\mathrm{O}$.

Q. Consider the given chemical equation and identify X.

$2{\mathrm{NaHCO}}_3\stackrel{\mathrm{Heat}}{\to }{\mathrm{Na}}_2{\mathrm{CO}}_3+H_{2}O+X$

1. $O_2$
2. $C{O}_2$
3. CO
4. $H_2$

Q.

Sodium carbonate is a basic salt because it is a salt of

1. strong acid and strong base

2. weak acid and weak base

3. strong acid and weak base

4. weak acid and strong base

Q.

Match List-I with List-II

List-I	List-II
(a) Ca(OCl)2	(i) Antacid
(b) CaSO4· 1/2H2O	(ii) Cement
(c) CaO	(iii) Bleach
(d) CaCO3	(iv) Plaster of Paris

Choose the most appropriate answer from the option given below:

1. (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)

2. (a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)

3. (a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)

4. (a)-(i), (b)-(iv), (c)-(iii), (d)-(ii)

Q. The common name of sodium carbonate ($N{a}_{2}C{O}_3$) is washing soda.

1. True
2. False

Q. Potash lime is also known as

1. Lead glass
2. Borosil glass
3. Bohemian glass
4. Pyrex

Q.

Question 05.
Sodium carbonate is a basic salt because it is a salt of
(a) strong acid and strong base
(b) weak acid and weak base
(c) strong acid and weak base
(d) weak acid and strong base

Q. Identify X in the following reaction:
$NaCl+H_{2}O+C{O}_2+N{H}_3$ $\to$ $N{H}_{4}Cl+X$

1. $NaHC{O}_3$
2. $N{a}_{2}C{O}_3$
3. $N{a}_{2}C{O}_3.10H_{2}O$
4. None of these

Q.

What is softening of hard water?

Q.

In laboratory, silicon can be prepared

1. None of these

2. By heating carbon in electric furnace

3. By heating potassium with potassium dichromate

4. Silica with magnesium

Q.

(a) Describe how washing soda is produced starting from sodium chloride (common salt). Write equations of all the reactions involved.

(b) State whether an aqueous solution of washing soda is acidic or alkaline ? Give reason for your answer.

(c) What is meant by saying that washing soda has detergent properties ?

(d) Give two important uses of washing soda (or sodium carbonate).

Q.

Write the chemical formula for the following and also calculate the molecular mass of baking powder.

1. $NaHC{O}_3,84gmo{l}^{-1}$
2. $NaHC{O}_3,86gmo{l}^{-1}$
3. $NaHC{O}_3,85gmo{l}^{-1}$
4. $NaHC{O}_3,88gmo{l}^{-1}$

Q. Sodium carbonate is also known as

1. Lime stone
2. Soda Ash
3. Silica
4. Glass

Q.

Write the chemical formula of (i) soda ash, and (ii) sodium chrbonate decahydrale.

Q.

What is washing soda? State two properties and two uses of washing soda

Q. Question 37.
How would you distinguish between baking powder and washing soda by heating ?

Q. Consider the given chemical equation and identify X.

$2{\mathrm{NaHCO}}_3\stackrel{\mathrm{Heat}}{\to }{\mathrm{Na}}_2{\mathrm{CO}}_3+H_{2}O+X$

1. $H_2$
2. $O_2$
3. CO
4. $C{O}_2$

Q.

Chlorides and sulphates of _______________( sodium and magnesium/ calcium and magnesium) cause permanent hardness.

Q. How would you distinguish between baking powder and washing soda by heating?

Q. Match the following columns.

Column (I)	Column (II)
(1) Bleaching powder	(a) Sodium bicarbonate
(2) Baking soda	(b) Sodium carbonate
(3) Washing soda	(c) Calcium oxychloride
(4) Plaster of Paris	(d) Calcium sulphate hemihydrate

1. (1) $\to$ (c), (2) $\to$ (a), (3) $\to$ (b), (4) $\to$ (d)
2. (1) $\to$ (a), (2) $\to$ (b), (3) $\to$ (c), (4) $\to$ (d)
   
3. (1) $\to$ (b), (2) $\to$ (c), (3) $\to$ (d), (4) $\to$ (a)
   
4. (1) $\to$ (d), (2) $\to$ (a), (3) $\to$ (b), (4) $\to$ (c)
   

Q.

Choose the correct option regarding the uses of washing soda.

1. All of the given options are correct.

2. It is used for removing permanent hardness of water.

3. It is used as a cleaning agent for domestic purposes.

4. It is used for manufacturing sodium compounds like borates.

Q.

Is${\mathrm{Na}}_2{\mathrm{CO}}_3$ it Basic or Acidic?

Q. A soap solution was added to the given water samples:-
A- distilled water, B- underground water and C- distilled water and CaSO₄.
Which of the given water sample will produce maximum foam and which will give rise to scum?

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

1. 10

Q. Match the following

	Column (A)		Column (B)
(a)	$NaHC{O}_3$	(i)	Caustic soda
(b)	$N{a}_{2}C{O}_3.10H_{2}O$	(ii)	Baking soda
(c)	$NaOH$	(iii)	Blue vitriol
(d)	$CuS{O}_4.5H_{2}O$	(iv)	Washing soda

1. a-(i), b-(ii), c-(iii), d-(iv)
2. a-(ii), b-(iv), c-(i), d-(iii)
3. a-(i), b-(iv), c-(ii), d-(iii)
4. a-(ii), b-(iv), c-(iii), d-(i)

Q. Name the sodium compound which is used for softening hard water.

Q. What is obtained when ${\text{NaHCO}}_3$ is heated?

1. $\text{NaOH}$

2. $\text{NaCl}$

3. ${\text{Na}}_2{\text{CO}}_3$

4. ${\text{NaCO}}_3$

Q.

Carbon dioxide is released when ________ is used in the manufacture of bakery items.

Q. The volume of $C{O}_2$ obtained by the complete decomposition of 9.8 g $N{a}_{2}C{O}_3$ at $STP$ is :

1. $0$ L
2. $11.2$ L
3. $2.06$ L
4. $4.5$ L

Q. The common name of sodium carbonate ($N{a}_{2}C{O}_3$) is washing soda.

1. True
2. False