Uses of Salts

Q.

The chemical formula of gypsum is_________

Q.

What is acetone solution?

Q.

Sodium bicarbonate is used in the baking industry.

Q.

By adding gypsum to cement:

1. Reduce setting time to cement B.

2. Produce very light colour cement.

3. Increases setting time of cement

4. A shining surface is formed.

Q.

Sodium hydrogen carbonate is commonly called as

1. sodium carbonate

2. sodium bicarbonate

3. sodium dioxide

4. None of the option

Q.

In the process of evaporation, which one of the following pieces of laboratory apparatus would not be used?

1. Bunsen burner

2. Filter

3. Evaporating basin

4. Wire gauze

Q.

71) How is cement manufactured? Mention the areas of application of cement.

Q. Give any two uses of common salt (sodium chloride).

Q. Gypsum is added to cement because:

1. it makes the cement very hard
2. it increases the pace of setting of cement
3. it slows down the initial setting of cement when water is added
4. none of the above

Q.

Is sodium hydroxide good for the face?

Q. Gypsum is added to cooled clinker during cement manufacture:

1. because gypsum permits formation of fine powder
2. to delay the initial setting time of cement
3. to increase the hardening of cement
4. to increase the strength of set concrete

Q.

The formula for sodium carbonate is:

1. Na₂CO₃

2. Na₃CO₂

3. NaCO₂

4. na₂CO₃

Q. A mixture of sand, salt and water can be separated by using which of the following processes?

1. Only evaporation
2. Only sedimentation
3. Decantation and filtration
4. Filtration, evaporation and condensation

Q. Sodium hydroxide is used in the manufacture of:

1. pulp and paper
2. textiles
3. soap and detergents
4. all of the above

Q.

The day of reopening of the school after summer break was coming closer for Rahul, a student of class 9. He went to the market to buy some stationary for himself. His mother told him to get a packet of salt also with him. When Rahul was coming back from the market the bag got split and the things fell on the ground. He started collecting the things but while doing so the things got mixed up. He somehow collected everything and reached home. The mother saw that the salt was mixed up with sand and stapler pins. Now answer the following questions in the chemistry notebook.
. Write the steps to separate sand, salt and stapler pins suggesting Rahul.

Q. Choose the correct option regarding the uses of Plaster of Paris.

1. It is used for making glass
2. It is used in soda-acid fire extinguisher.
3. It is used for making soaps.
4. It is used by doctors for supporting fractured bones.

Q.

when water is boiled the germs in the water is killed after killing, the germs remain in the water so water becomes harmful ?

Q. Potash alum is widely used in:

1. land treatment
2. water treatment
3. air treatment
4. all of the above

Q. ${\mathrm{CaOCl}}_2$ is the product formed due to the reaction between calcium hydroxide and ___ and is commonly known as ___.

1. chlorine, bleaching powder
2. hydrochloric acid, baking powder
3. hydrogen, washing soda
4. hydrochloric acid, baking soda

Q. What is used in photography for developing films?

1. Silver nitrate
2. Silver bromide
3. Silver iodide
4. Silver chloride

Q. Match Column I with Column II and choose he correct option from the codes given below:

Q. Highly concentrated aqueous solution of sodium chloride is called __________.

1. bleaching solution
2. washing powder
3. brine solution
4. baking powder

Q. Which of the following are the uses of ${\text{CaOCl}}_2$?

1. Used for bleaching of clothes
2. Used for softening of water
3. Used for baking
4. Used for disinfecting the garbage sites

Q. Which of the following statements are true about sodium chloride?

1. It is a colourless salt.
2. It is formed from a neutralisation reaction.
3. It is used in the preparation of sodium carbonate.
4. It has pH value 6.

Q. The compound present in bone ash is:

1. calcium carbonate
2. calcium phosphate
3. calcium sulphate
4. calcium hydroxide

Q. What are the uses of chlorine?

1. DDT manufacture
2. Disinfectant
3. PVC manufacture
4. Antiseptic
5. Bleaching
6. Dyes
7. Indicator
8. Paint
9. Lubricant

Q. Complete the following reaction:
$+H_{2}O\left(l\right)+C{O}_2\left(g\right)+N{H}_3\left(g\right)\to$$+{\mathrm{NH}}_4\mathrm{Cl}\left(\mathrm{aq}\right)$

1. $NaCl$(aq)
2. $N{a}_{2}C{O}_3$(aq)
3. $NaHC{O}_3$(s)
4. $N{a}_{2}C{O}_3$(s)

Q. Which of the following salt is used as a laxative?

1. Epsom salt
2. Blue vitrol
3. Green vitrol
4. Plaster of Paris

Q. The salt we use in our food is:

1. $CaC{l}_2$
2. $NaCl$
3. $KCl$
4. $MgC{l}_2$

Q. Q. CaOCl2 is used for - a) In soda acid fire extinguishers , b) For supporting fractural bones in right position , c) To make drinking water free from germs , d) As an antacid