Chhattisgarh State Board Class 10 Science Chapter 17 Chemistry in Daily Life Exercise Multiple Choice, Fill in the Blanks, Questions and Answers here.
Chhattisgarh State Class 10 Science Chapter 17 Solution
1) Choose the correct option:
(i) The chemical formula of baking soda is:
(a) NaHSO4
(b) Na2CO3
(c) NaHCO3
(d) Na2CO3.10H2O.
Ans: – (c) NaHCO3.
(ii) The chemical substance that is used for disinfecting drinking water to make it free ofgerms is:
(a) CaCl2
(b) CaOCl2
(c) FeCl3
(d) MgCl2.
Ans: – (b) CaOCl2.
(iii) Glass is a
(a) Liquid (b) Solid
(c) Transparent carbon polymer (d) Super-cooled liquid.
Ans: – (d) super cooled liquid.
(iv) Plaster of Paris hardens by
(a) Losing CaCl2
(b) Releasing CO2
(c) Absorbing water (d) Releasing water.
Ans: – (c) Absorbing water.
2) Match words in column A with the correct options in column B
Column A Column B
Bleaching powder super-cooled liquid
Baking soda. clinker
Washing soda. preservative
Sodium chloride Bleaching agent
Glass manufacture Antacid.
Ans: –
Column A |
Column B |
Bleaching powder |
Bleaching agent |
Baking soda |
Antacid |
Washing soda |
Glass manufacture |
Sodium chloride |
Preservation |
3) What is hard water? What is soft water?
Ans: – There is a high mineral present in hard water. From the deposit of calcium and magnesium carbonate and bicarbonate the hard water is formed.It has various health benefits.
In a soft water there is no presence such metal like iron, calcium, magnesium etc. The rain water is an example of the soft water.
4) What are the factors that cause hardness of water? How many types of hardness are there?
Ans: – The different substance that after mixing with the water or after dissolving in water effect the hardness of water like calcium and magnesium carbonate which after mixing in water makes the PH value of water high.
The hardness of water is two types such as –
- Temporary Hardness.
- Permanent Hardness.
5) How do animals and plants, living in lakes and ponds in snowy regions, survive during winter?
Ans: – The water density is Maximum at 4℃ which makes the water to stay its form at beneath the ice sheet in harsh winter. As well as the oxygen remain in under water before the ice filled in upper region which makes the aquatic animal survive in lakes in winter time.
6) What is baking powder? How does it make cakes soft and spongy?
Ans: – The mixture of tartaric acid and baking soda is known as the baking powder. It’s used for food preservation sometimes.
This baking powder make the cake soft. After mixing with the water the reaction between the baking soda, tartaric acid and water produces the carbon dioxide. When this CO2 wanted to came out the cake become soft and spongy.
7) What is the process of making Plaster of Paris? Why is it stored in air-tight containers?
Ans: –Plaster of Paris is nothing but the calcium sulphate hemihydrate or CaSO4. 2H2O. It produces after the heating of gypsum.
The precautions that must be taken for the storage of plaster of Paris that should not came it contact with the moisture because after that it becomes solid making gypsum again.
8) What is the chemical name for washing soda? Name the three main raw materials used to produce washing soda by the Solvay ammonia process.
Ans: – The chemical name of washing soda is sodium carbonate (Na2CO3).
The raw material used to produce washing soda is sodium chloride (NaCl), Calcium carbonate (CaCO3) , Ammonia (NH3).
9) A compound of calcium, which is a white powder having a yellow tinge, is used in the textile industry and as a disinfectant.
(i) Name the compound.
(ii) Which gas is released when the compound is left out in open air? Give the balanced equation for this reaction.
Ans: – (i) The compound is Calcium oxychloride CaOCl2.
(ii) Chlorine gas will be released.
The reaction is, Ca (OH)2 + Cl2 –> CaOCl2 + H2O;
10) A compound of sodium, ‘X’, is a white powder and an important component of baking powder. When ‘X’ is heated, a gas ‘Y’ is produced that turns lime water milky.
(i) Write the chemical equation for the reaction which takes place on heating.
(ii) Why is ‘X’ used as an antacid?
Ans: – (i) The chemical equation after heating is,
2NaHCO3 –> Na2CO3 + CO2 + H2O;
(ii) The x compound is alkaline in nature so for this reason it uses as the antacids for the acidity in our stomach.
11) Describe the steps in the process of glass manufacture under each of the following headings:
(i) Necessary materials
(ii) Substances that give or impart colour to glass
(iii) The chemical reaction taking place in tank furnace.
Ans: – (i) Material: – sand as silicate, sodium or potassium carbonate, lead oxide, manganese dioxide, NaNO3.
(ii) Colouring material: – chromium oxide (green), cadmium sulphide (yellow),copper oxide (red), manganese oxide (purple), cobalt oxide (blue).
(iii) The different chemical reaction that happens in the tank furnace,
Na2CO3 + SiO2 –> Na2SiO3 + CO2
CaCO3 + SiO2 –> CaSiO3 + CO2
Na2SiO3 + CaSiO3 + 4SiO2 –> Na2O.CaO.6SiO.
12) Write the different steps involved in cement production.
Ans: – Different steps that are follows for the production of cement is –
• After crushing reclaim the raw material.
• Grinding raw material
• Homogenization.
• Clinkerizetion.
• Grinding and storage cement.
• Packaging.
13) How are soap-micelles formed? Describe.
Ans: – The soap bubbles are hydrophilic in nature. The different particle like dirt, fat, oil mixed with it. After mixing of these tiny cluster the soap micelles are formed.
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