Case Study Questions Class 10 Science Chapter 4 Carbon and its Compounds
CBSE Class 10 Case Study Questions Science Carbon and its compounds. Term 2 Important Case Study Questions for Class 10 Board Exam Students. Here we have arranged some Important Case Base Questions for students who are searching for Paragraph Based Questions Carbon and its compounds.
At Case Study Questions there will given a Paragraph. In where some Important Questions will made on that respective Case Based Study. There will various types of marks will given 1 marks, 2 marks, 3 marks, 4 marks.
CBSE Case Study Questions Class 10 Science Carbon and its compounds
CASE STUDY : 1
Carbon has the unique ability to form bonds with other atoms of carbon, giving rise to large molecules. This property is called catenation. These compounds may have long chains of carbon, branched chains of carbon or even carbon atoms arranged in rings. In addition, carbon atoms may be linked by single, double or triple bonds.
i) What are saturated compounds?
Ans: Compounds of carbon that are linked by only single bond between the carbon atoms are called as saturated compounds.
Eg: C2H6, CH4
ii) What is the another versatile property of carbon?
Ans: The tetravalent nature of carbon i.e it has four valency and it is capable of bonding with other four atoms of carbon or any other atom of monovalency.
iii) Give two example of unsaturated compounds.
Ans- Ethene- C2H4 & Ethyne- C2H2
iv) What would be the electron dot structure of C2H6.
Ans-
v) Name any one element other than carbon which show catenation property?
Ans- Sulphur i.e S8 molecule.
CASE STUDY :2
Carbon, in all its allotropic forms, burns in oxygen to give carbon dioxide along with the release of heat and light. Most carbon compounds also release a large amount of heat and light on burning.
Saturated hydrocarbons will generally give a clean flame while unsaturated carbon compounds will give a yellow flame with lots of black smoke.
i) Complete the reaction: CH3CH2OH +O2 gives
Ans: CH3CH2OH + O2 👉 CO2 + H2O + heat & light.
ii) What is the reason for incomplete combustion?
Ans: When the supply of air is limited for combustion, then the fuel goes partial combustion which results in sooty flame.
iii) Combustion is an oxidation or reduction type of reaction?
Ans: It is an oxidation type of reaction as oxygen get added to reactant.
Eg: C+ O2 👉 CO2 + heat aand light.
iv) Draw the structure of the compound: But-2- yne.
Ans:
V) What is homologous series?
Ans- A series of compound in which the same functional group substitutes for hydrogen in a carbon chain.
Eg: C2H6 & C3H6. – these differ by CH2 unit.
CASE STUDY : 3
Carbon compounds can be easily oxidised on combustion. In addition to this complete oxidation, we have reactions in which alcohols are converted to carboxylic acids.
We see that some substances are capable of adding oxygen to others. These substances are known as oxidisingagents.
i) Give two example of good oxidising agent.
Ans: Alkaline potassium permanganate or acidified potassium dichromate.
ii) Complete the reaction: CH3CH2CH2OH + Alk. KMnO4 👉?
Ans: CH3CH2CH2OH + Alk. KMnO4 👉 CH3CH2COOH.
iii) What are the uses of alcohol?
Ans: Good solvent, used to make syrups & drinks.
iv) Why Acidified potassium dichromate is called an oxidising agent?
Ans: It is because they can add oxygen to the reactant molecule very easily and convert them to acid.
v) What is the use of ethanoic acid?
Ans: used as preservatives in pickle and also to make esters.
CASE STUDY : 4
Most dirt is oily in nature and as you know, oil does not dissolve in water. The molecules of soap are sodium or potassium salts of long-chain carboxylic acids. The ionic-end of soap interacts with water while the carbon chain interacts with oil. The soap molecules, thus form structures called micelles, where one end of the molecules is towards the oil droplet while the ionic-end faces outside. This forms an emulsion in water. The soap micelle thus helps in pulling out the dirt in water and we can wash our clothes clean
i) What is hydrophobic end?
Ans- Soap molecules have two ends in which one is hydrophobic end which interacts with hydrocarbons and do not dissolve in water.
ii) Draw the structure of micelle.
Ans:
iii) What are scums?
Ans- An insoluble substance(white precipitate) remains after washing with water. It is formed by the reaction of soaps with the calcium and magnesium salts.
iv) What is hard water?
Ans: The water which contains Calcium and magnesium salts in it and form insoluble precipitates when treated with soap are called hard water.
V) To remove hardness of water, the water is treated with soap or detergent?
Ans: Detergent are effective in hard water as they contain sodium salts of sulphonic acid or ammonium salts with chlorides or bromides ions etc.
CASE STUDY :5
Ethanoic acid is commonly called acetic acid and belongs to a group of acids called carboxylic acids. 5-8% solution of acetic acid in water is called vinegar and is used widely as a preservative in pickles.
i) What is glacial acetic acid?
Ans: The melting point of ethanoic acid is 290K, so its often freezes during winter. Hence, gave rise to new name called as glacial acetic acid.
ii) Complete the reaction: NaOH + CH3CH2COOH 👉?
Ans: NaOH + CH3CH2COOH👉 CH3CH2COONa + H2O
iii) What is esterification reaction?
Ans: The reaction of carboxylic acid with an alcohol give rise to fruity smell called as esters. This process of the formation of esters is called esterification reaction.
Eq- CH3COOH + CH3CH2OH + Conc. H2SO4👉 CH3COOCH2CH3 + H2O
iv) What happens when ethanoic acid is reacted with carbonates and bicarbonates?
Ans: They give rise to salt, Carbon dioxide, and water.
V) Write the reaction of ethanoic acid with sodium hydrogen carbonate?
Ans: CH3COOH + NaHCO3 👉 CH3COONa + H2O + CO2
Case Study – 6
Frothing in Yamuna:
The primary reason behind the formation of the toxic foam is high phosphate content in the wastewater because of detergents used in dyeing industries, dhobi ghat and households. Yamuna’s pollution level is so bad that parts of it have been labelled ‘dead’ as there is no oxygen in it for aquatic life to survive.
[ CBSE Academic Question Paper ]
1) Predict the pH value of the water of river Yamuna if the reason for froth is high content of detergents dissolved in it.
- a) 10-11
- b) 5-7
- c) 2-5
- d) 7
Answer – a) 10-11
2) Which of the following statements is correct for the water with detergents dissolved in it?
- a) low concentration of hydroxide ion (OH-)and high concentration of hydronium ion (H3O+)
- b) high concentration of hydroxide ion (OH-)and low concentration of hydronium ion (H3O+)
- c) high concentration of hydroxide ion (OH-) as well as hydronium ion (H3O+)
- d) equal concentration of both hydroxide ion (OH-) and hydronium ion (H3O+).
Answer- b) high concentration of hydroxide ion (OH-) and low concentration of hydronium ion (H3O+)
3) If a sample of water containing detergents is provided to you, which of the following methods will you adopt to neutralize it?
- a) Treating the water with baking soda
- b) Treating the water with vinegar
- c) Treating the water with caustic soda
- d) Treating the water with washing soda
Answer – b) Treating the water with vinegar
4) High content of phosphate ion in river Yamuna may lead to:
- a) decreased level of dissolved oxygen and increased growth of algae.
- b) decreased level of dissolved oxygen and no effect of growth of algae.
- c) increased level of dissolved oxygen and increased growth of algae.
- d) decreased level of dissolved oxygen and decreased growth of algae.
Answer – a) decreased level of dissolved oxygen and increased growth of algae.
Case Study – 7
Marble’s popularity began in ancient Rome and Greece, where white and off-white marble were used to construct a variety of structures, from hand-held sculptures to massive pillars and buildings.
1) Gas A, obtained above is a reactant for a very important biochemical process which occurs in the presence of sunlight. Identify the name of the process –
- a) Respiration
- b) Photosynthesis
- c) Transpiration
- d) photolysis
Answer – Photosynthesis
2) A student added 10g of calcium carbonate in a rigid container, secured it tightly and started to heat it. After some time, an increase in pressure was observed, the pressure reading was then noted at intervals of 5 mins and plotted against time, in a graph as shown below. During which time interval did maximum decomposition took place ?
a) 15-20 min
b) 10-15 min
c) 5-10 min
d) 0-5 min
Answer – d) 0-5 min
3) Calcium oxide can be reduced to calcium, by heating with sodium metal. Which compound would act as an oxidizing agent in the above process?
a) Sodium
b) sodium oxide
c) calcium
d) calcium oxide
Answer – d) calcium oxide
4) Marble statues are corroded or stained when they repeatedly come into contact with polluted rain water. Identify the main reason
a) decomposition of calcium carbonate to calcium oxide
b) polluted water is basic in nature hence it reacts with calcium carbonate
c) polluted water is acidic in nature he
d) calcium carbonate dissolves in water to give calcium hydroxide.
Answer – b) polluted water is acidic in nature hence it reacts with calcium carbonate
Case Study – 8
Chemistry in Automobiles:
Foran internal combustion engine to move a vehicle down the road, it must convert the energy stored in the fuel into mechanical energy to drive the wheels. In your car, the distributor and battery provide this starting energy by creating an electrical “spark”, which helps in combustion of fuels like gasoline. Below is the reaction depicting complete combustion of gasoline in full supply of air:
1) Identify the types of chemical reaction occurring during the combustion of fuel:
- a) Oxidation & Endothermic reaction
- b) Decomposition & Exothermic reaction
- c) Oxidation & Exothermic reaction
- d) Combination & Endothermic reaction
Answer – c) Oxidation & Exothermic reaction
2) ‘Although nitrogen is the most abundant gas in the atmosphere, it does not combustion’. Identify the correct reason for this statement.
- a) Nitrogen is a reactive gas
- b) Nitrogen is an inert gas
- c) Nitrogen is an explosive gas
- d) Only hydrocarbons can take part in combustion
Answer – b) Nitrogen is an inert gas
3) ‘A student while walking on the road observed that a cloud of black smoke belched out from the exhaust stack of moving trucks on the road.’ Choose the correct reason for the production of black smoke:
a) Limited supply of air leads to incomplete combustion of fuel.
b) Rich supply of air leads to complete combustion of fuel.
c) Rich supply of air leads to a combination reaction.
d) Limited supply of air leads to complete combustion of fuel.
Answer – Limited supply of air leads to incomplete combustion of fuel.
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