Washing Soda

Q. The chemical formula of washing soda is:

1. $N{a}_{2}C{O}_3.7H_{2}O$
2. $N{a}_{2}C{O}_3.10H_{2}O$
3. $N{a}_{2}C{O}_3.H_{2}O$
4. $N{a}_{2}C{O}_3$

Q.

Write the chemical name and formula for caustic soda

Q. Question 44.
For making cake, baking powder is taken. If at home your mother uses baking soda instead of baking powder in cake.

1. How will it affect the taste of the cake and why ?
2. How can baking soda be converted into baking powder ?
3. What is the role of tartaric acid added to baking soda ?

Q. Which of the following option is not a property of washing soda?

1. It is a white powder.
2. It is odourless.
3. It is acidic in nature.
4. It is hygroscopic in nature.

Q. Write the chemical equations for the following activities. (EX.Q.8.d)
Carbon dioxide gas was passed through KOH solution.

Q.

Write the chemical names of the following formulae:

${\mathrm{CaCO}}_3$

Q. A crystalline substance P is a water soluble salt. It forms insoluble salt on reaction with magnesium chloride. The chemical formula of P is:

1. ${\mathrm{CaOCl}}_2$
2. ${\mathrm{Na}}_2{\mathrm{SO}}_4$
3. ${\mathrm{BaCl}}_2.2H_{2}O$
4. ${\mathrm{Na}}_2{\mathrm{CO}}_3$

Q. Which of the following reactions is not associated with solvays process of manufacture of sodium carbonate?

1. 

2. 

3. 

4. 

Q.

Calcium carbonate decompose into ________ and ________.

Q.

E. Tick the most appropriate answer:

2. $2{\mathrm{NaHCO}}_3\to {\mathrm{NaCO}}_3+{\mathrm{H}}_2\mathrm{O}+{\mathrm{CO}}_2$ ,

In the above formula of :

1. sodium bicarbonate is incorrect

2. sodium carbonate is incorrect

3. carbon dioxide is incorrect

4. water is incorrect

Q.

Baking soda is used in small amounts for making bread and cake. It helps to make these soft and spongy. An aqueous solution of baking soda turns red litmus blue. It is also used in soda-acid fire extinguishers.

How does baking soda help to make bread and cake soft and spongy?

Q. Analyse the chemical equation given below and identify the product of the reaction from the given options.

${\text{Na}}_2{\text{CO}}_3\text{(aq)}+{\text{H}}_2{\text{SO}}_4\text{(aq)}\to ?$

1. ${\mathrm{NaHSO}}_4\left(\mathrm{aq}\right)+{\mathrm{CO}}_2\left(g\right)+H_{2}O\left(l\right)$
2. ${\mathrm{Na}}_2{\mathrm{SO}}_4\left(\mathrm{aq}\right)+{\mathrm{SO}}_2\left(g\right)+H_{2}O\left(l\right)$
3. ${\mathrm{Na}}_2{\mathrm{SO}}_4\left(\mathrm{aq}\right)+{\mathrm{CO}}_2\left(g\right)+H_{2}O\left(l\right)$
4. ${\mathrm{Na}}_2{\mathrm{SO}}_4\left(\mathrm{aq}\right)+{\mathrm{CO}}_2\left(g\right)+H_2\left(g\right)$

Q. A water soluble salt P on reaction with sulphuric acid gives the products Q, carbon dioxide and water. Identify P and Q.

1. $P\mathrm{is}{\mathrm{Na}}_2{\mathrm{SO}}_{4}Q\mathrm{is}{\mathrm{Na}}_2{\mathrm{CO}}_3$
2. $P\mathrm{is}{\mathrm{Na}}_2{\mathrm{CO}}_{3}Q\mathrm{is}{\mathrm{Na}}_2{\mathrm{SO}}_4$
3. $P\mathrm{is}\mathrm{NaCl}Q\mathrm{is}{\mathrm{Na}}_2{\mathrm{SO}}_4$
4. $P\mathrm{is}{\mathrm{Na}}_2{\mathrm{CO}}_{3}Q\mathrm{is}\mathrm{NaCl}$

Q. How can we remove permanent hardness from water?

Q.

Write the common and chemical names of the compound CaSO⁠⁠⁠⁠⁠⁠⁠₄.0.5H₂O.

Q.

Give the molecular formula of these compounds.

Calcium carbonate

Q. Identify the reactants in the following reaction.

$\text{KOH(aq)}+{\text{HNO}}_3\text{(aq)}\to {\text{H}}_2\text{O(l)}+{\text{KNO}}_3\text{(aq)}$

1. ${\text{H}}_2\text{O}$, ${\text{KNO}}_3$
2. ${\text{HNO}}_3$, ${\text{H}}_2\text{O}$
3. $\text{KOH}$, ${\text{HNO}}_3$
4. ${\text{KNO}}_3$, $\text{KOH}$

Q. Which of the following is known as soda ash ?

1. $N{a}_{2}S{O}_4$
2. $N{a}_{2}C{O}_3.H_{2}O$
3. $N{a}_{2}C{O}_3$
4. NaOH

Q. The reaction given below is an example of:
$N{a}_{2}S{O}_4\left(aq\right)+BaC{l}_2\left(aq\right)\to BaS{O}_4\left(s\right)+2NaCl\left(aq\right)$

1. Combination reaction
2. Decomposition reaction
3. Displacement reaction
4. Double displacement reaction

Q. Hydrated cobalt chloride on being heated to anhydrous form which is :

1. yellowish
2. reddish
3. greenish
4. bluish

Q.

The chemical formula of washing soda is:

1. ${Na}_2{CO}_3.H_{2}0$

2. ${Na}_2{CO}_3$

3. $NaOH$

4. ${NaHCO}_3$ ​

Q. An efflorescent crystal.

1. Water
2. Calcium oxide
3. Hydrogen
4. Washing soda