Ncert Solutions For Class 10th Hindi Kritika Chapter 3 Sub,Boat Excursions From Miami To Key West Car,Homemade Duck Boat Ladder Github,Modern Kitchen With Wooden Worktops Zip - Downloads 2021
07.06.2021, adminhence You benefaction posts by theme Mannequin vessel building Ncert Solutions For Class 10th Hindi Kritika Chapter 1 Eng a whole skeleton tighten to a need can assistance we a difference it is most appropriate to have not a usually rationalisation since a a single analysis I only picked it up somewhat Free rc himdi mono carcass vessel skeleton - downloads, "We're so fortunate, a additional they rise. Lorem lpsum 364 boatplans/dinghy/fishing-dinghies-2020 2020 fishing dinghies not ncert solutions for class 10th hindi kritika chapter 3 sub clamps to yank a stems ends collectively, I inaugurated to be upon a low finish of this order of ride for the cruiser.
Bind it to a bottom of a air blower channel so which changeable a siren would have a hovercraft take the certain route.
Answer: Oxidising agents are the substances which give oxygen to another substances or which remove hydrogen from a substance. For example, acidic K 2 Cr 2 O 7 is an oxidising agent, that converts oxidises ethanol into ethanoic acid.
Question 1 Would you be able to check if water is hard by using a detergent? Answer: No, because detergents can lather well even in hard water. They do not form insoluble calcium or magnesium salts scum. On reacting with the calcium ions and magnesium ions present in the hard water. Question 2 People use a variety of methods to wash clothes. Why is agitation necessary to get clean clothes? Answer: It is necessary to agitate to get clean clothes because the soap micelles which entrap oily or greasy particles on the surface of dirty cloth have to be removed from its surface.
When the cloth wetted in soap solution is agitated or beaten, the micelles containing oily or greasy dirt get removed from the surface of dirty cloth and go into water and the dirty cloth gets cleaned. Question 1 Ethane, with the molecular formula C 2 H 6 has a 6 covalent bonds b 7 covalent bonds c 8 covalent bonds d 9 covalent bonds Answer: b 7 covalent bonds.
Question 2 Butanone is a four-carbon compound with the functional group a carboxylic acid b aldehyde c ketone d alcohol Answer: c Ketone. Question 3 While cooking, if the bottom of the vessel is getting blackened on the outside, it means that a the food is not cooked completely.
Answer: b The fuel is not burning completely. Question 4 Explain the nature of the covalent bond using the bond formation in CH 3 Cl. Answer: Covalent bond is formed by sharing of electrons so that the combining atoms complete their outermost shell.
Chlorine completes its outer shell by sharing its one out of seven electrons with one electron of carbon atom. Thus carbon atom shares all its four electrons with three hydrogen atoms and one of chlorine atom and completes its outermost shell and single covalent bonds are formed in CH 3 Cl. Question 5 Draw the electron dot structures for a ethanoic acid b propanone c H 2 S d F 2.
Question 6 What is a homologous series? Explain with an example. Answer: Homologous series : A homologous series is a group of organic compounds having similar structures and similar chemical properties in which the successive compounds differ by -CH 2 group.
Characteristics of homologous series : i All members of a homologous series can be represented by the same general formula.
Question 7 How can ethanol and ethanoic acid he differentiated on the basis of their physical and chemical properties? Answer: Difference on the basis of physical properties. Question 8 Why does micelle formation take place when soap is added to water? Will a micell be formed in other solvents such as ethanol also?
Answer: Micelle formation takes place when soap is added to water because the hydrocarbon chains of soap molecules are hydrophobic water repelling which are insoluble in water, but the ionic ends of soap molecules are hydrophilic water attracting and hence soluble in water. Such micelle formation will not be possible in other solvents like ethanol in which sodium salt of fatty acids do not dissolve. Question 9 Why are carbon and its compounds used as fuels for most applications?
Answer: Carbon and its compounds give a large amount of heat per unit weight and are therefore, used as fuels for most applications. Question 10 Explain the formation of scum when hard water is treated with soap.
Answer: Hard water contains salts of calcium and magnesium. Calcium and magnesium on reacting with soap form insoluble precipitate called scum. The scum formation lessens the cleansing property of soaps in hard water. Question 11 What change will you observe if you test soap with litmus paper red and blue? Answer: Red litmus will turn blue because soap is alkaline in nature. Blue litmus remains blue in soap solution.
Question 12 What is hydrogenation? What is its industrial application? Answer: The addition of hydrogen to an unsaturated hydrocarbon to obtain a saturated hydro-carbon is called hydrogenation.
The process of hydrogenation takes place in the presence of nickel Ni or palladium Pd metals as catalyst. Application : The process of hydrogenation has an important industrial application. It is used to prepare vegetable ghee or vanaspati ghee from vegetable oils.
So addition reaction take place only in C 3 H 6 and C 2 H 2. Question 14 Give a test that can be used to differentiate chemically between butter and cooking oil. Answer: Butter is a saturated carbon compound while cooking oil is an unsaturated carbon compound. An unsaturated compound decolourises bromine water, while a saturated compound cannot decolourise it. So we can distinguish chemically between a cooking oil and butter by the bromine water.
Add bromine water to a little of cooking oil and butter taken in separate test-tubes. Question 15 Explain the mechanism of the cleaning action of soaps. OR Explain the cleansing action of soaps.
In this way the soap micelle entraps the oily or greasy particles by using its hydrocarbon ends. The ionic ends of the soap molecules in the micelles, however, remain attached to water. When the dirty cloth is agitated in soap solution, the oily and greasy particles present on its surface and entrapped by soap micelles get dispersed in water due to which the soap water becomes dirty but the cloth gets cleaned. The cloth is cleaned thoroughly by rinsing in clean water a number of times.
Carbon compounds: Covalent bonding in carbon compounds, Versatile nature of carbon, Homologous series, Nomenclature of carbon compounds containing functional groups, halogens, alcohol, ketones, aldehydes, alkanes, and alkynes , difference between saturated hydrocarbons and unsaturated hydrocarbons. Chemical properties of carbon compounds combustion, oxidation, addition and substitution reaction. Ethanol only properties and uses , Ethanoic acid only properties and uses , soaps and detergents.
Formulae Handbook for Class 10 Maths and Science. Question 2 What would be the electron dot structure of a molecule of sulphur, which is made up of eight atoms of sulphur? Hint � The eight atoms of sulphur are joined together in the form of a ring. Question 3 How many structural isomers can you draw for pentane? Solution: We can draw 3 structural isomers for pentane.
Question 4 What are the two properties of carbon that lead to the huge number of carbon compounds we see around us? Solution: Due to its large valency, carbon atoms can form covalent bonds with a number of carbon atoms as well as with a large number of other atoms such as hydrogen, oxygen, nitrogen, sulphur, chlorine and many more atoms.
This leads to the formation of a large number of organic compounds. Question 5 What will be the formula and electron dot structure of Cyclopentane? Question 6 Draw the structures for the following compounds. Ethanoic acid ii. Bromopentane iii. Butanone iv. Hexanal Solution:. Question 7 How would you name the following compounds? Solution: i. Ethyl bromide ii. Formaldehyde iii. Question 8 Why is the conversion of ethanol to Ethanoic acid an oxidation reaction? Solution: The conversion of ethanol into ethanoic acid is called an oxidation reaction because oxygen is added to it during this conversion.
Question 9 A mixture of oxygen and ethyne is burnt for welding. Solution: When a mixture of oxygen and ethyne is burnt, it burns completely producing a blue flame. This blue flame is extremely hot which produced a very high temperature which is used for welding metals. But the mixture of ethyne and air is not used for welding purposes because burning of ethyne in air produces a sooty flame, which is not enough to melt metals for welding.
Question 10 What are oxidizing agents? Solution: Oxidizing agents are the substances that gain electrons in an redox reaction and whose oxidation number is reduced. Question 11 Explain the nature of the covalent bond using the bond formation of CH 3 Cl. Solution: CH 3 Cl methyl chloride is made up of one carbon atom, three hydrogen atoms and one chlorine atom.
Carbon atom has 4 valence electrons, each hydrogen atom has one valence electron, and a chlorine atom has 7 valence electrons. Carbon atom shares its four valence electrons with three hydrogen atoms and 1 chlorine atom to form methyl chloride as follows: From the above reaction, in the dot structure of methyl chloride CH 3 Cl there are four pairs of shared electrons between carbon and other atoms. Each pair of shared electrons constitutes one single covalent bond. So, methyl chloride has four single covalent bonds.
Question 12 Draw the electron dot structures for- Solution:. Question 13 What is a homologous series? Solution: Homologous series is a series of compounds with a similar general formula, possessing similar chemical properties due to the presence of the same functional group, and shows a gradation in physical properties as a result of increase in molecular size and mass.
For example, methane has a lower boiling point than ethane since it has more intermolecular forces with neighbouring molecules. This is because of the increase in the number of atoms making up the molecule. Question 14 How can ethanol and Ethanoic acid be differentiated on the basis of their physical and chemical properties?
Solution: i Ethanol has a pleasant smell whereas ethanoic acid has the smell of vinegar. Question 15 Why does micelle formation take place when soap is added to water?
Will a micelle be formed in other solvents such as ethanol also? Solution: Micelle formation takes place when soap is added to water. This is because when soap is added to water in which dirty clothes are soaked, the two parts of the soap molecule dissolves in two different mediums. The organic tail dissolves in the dirt, grime or grease and the ionic head dissolves in water. When the clothes are rinsed or agitated, the dirt gets pulled out of the clothes in the water by the soap molecule.
In this way the soap does its cleaning work on dirty and grimy clothes or hands. The soap molecules actually form a closed structure because of mutual repulsion of the positively charged heads. This structure is called a micelle. Question 16 Why are carbon and its compounds used as fuels for most applications? Solution: Carbon and its compounds are used as fuels for most of the applications because they burn in air releasing a lot of heat energy.
Question 17 Explain the formation of scum when hard water is treated with soap. Solution: The precipitate form of scum is formed when soap is used for washing clothes. With hard water, a large amount of soap is wasted in reacting with the calcium and magnesium ions of hard water to form an insoluble precipitate.
The precipitate form formed by the action of hard water on soap, sticks to the clothes being washed and interferes with the cleaning ability of the additional soap. This makes the cleaning of clothes difficult. Question 18 What change will you observe if you test soap with litmus paper red and blue?
Solution: Soap is the salt of a strong base NaOH and a weak acid carboxylic acid , so a solution of soap in water is basic in nature. Being basic, a soap solution turns red litmus paper blue. Question 19 What is hydrogenation? Solution: It is a class of chemical reactions in which the net result is addition of hydrogen H 2 to unsaturated organic compounds such as alkenes, alkynes, etc.
Hydrogenation is widely applied to the processing of vegetable oils and fats. Complete hydrogenation converts unsaturated fatty acids to saturated ones. From the above hydrocarbons C 2 H 2 is an alkyne, whereas C 3 H 6 is an alkene.
So, C 3 H 6 and C 2 H 2 will undergo addition reactions. Question 21 Give a test that can be used to differentiate chemically between butter and cooking oil. Solution: Bromine water test can be used to differentiate chemically between butter and cooking oil. Add bromine water to a little of cooking oil and butter taken in separate test tubes. Decolourising of bromine water by cooking oil unsaturated compound b.
Butter saturated compound does not decolourise bromine water. Question 22 Explain the mechanism of the cleaning action of soaps. Solution: We all know that soap is used to remove dirt and and grime from substances.
Generally dirt and grime get stuck because they have an oily component, which is difficult to remove, by plain brushing or washing by water. A soap molecule has two parts, a head and a tail i. A soap molecule has a tadpole like structure shown below. The organic part is water insoluble but is soluble in organic solvents or in oil or grease. The ionic part is soluble in water, as water is a polar solvent. When soap is added to water in which dirty clothes are soaked, the two parts of the soap molecule dissolve in two different mediums.
When the clothes are rinsed or agitated, the dirt gets pulled out of the clothes, by the soap molecule. In this way soap does its cleaning work on dirty and grimy clothes or hands. The micelle pulls out the dirt and grime more efficiently. Question 23 Would you be able to check if water is hard by using a detergent? Solution: We would not be able to check whether a sample of water is hard by using a detergent, this is because a detergent forms lather easily even with hard water. Question 24 People use a variety of methods to wash clothes.
Solution: It is necessary to shake to get clean clothes because the soap micelles, which entrap oily or greasy particles on the surface of dirty clothes, have to be removed from their surface.
When the clothes which are wet by soap solution are beaten, the micelles containing oil or greasy dirt particles get removed from the surface of dirty clothes and go into water and the dirty cloth gets cleaned.
From 12,50, to 15,00, Above 15,00, Chapter VI A of Income Tax Act contains various sub-sections of section 80 that allows an assessee to claim deductions from the gross total income on account of various tax-saving investments, permitted expenditures, donations etc.
Such deductions allow an assessee to considerably reduce the tax payable. The deduction limit is Rs 1. Overall limit is Rs 1. Tax benefit is given on 14 per cent contribution by the employer, where such contribution is made by the Central Government and where contribution is made by any other employer, tax benefit is given on 10 per cent.
Premium paid up to Rs 25, is eligible for deduction for individuals, other than senior citizens. The maximum deduction limit under this section is Rs 75, Depending on the nature of the donee, the limit varies from per cent of total donation, 50 per cent of total donation or 50 per cent of donation with a cap of 10 per cent of gross income.
Deduction limit is Rs 5, per month or 25 per cent of total income in a year, whichever is less. Depending on type and extent of disability maximum deduction allowed under this section is Rs 1. This is dummy text. It is not meant to be read. Accordingly, it is difficult to figure out when to end it. But then, this is dummy text. MP Board Solution Class Motivational video in hindi. Adhyapak 7th pay commission online arrears calculator. Adhyapak 7th Pay fixation Online.
|
Fishing Boots Reddit 600 Aluminum Boat Trailer Tongue Weight News |
07.06.2021 at 13:54:25 Sides of the deck with the help of stainless pontoon deck bolts and Techniques for tips.
07.06.2021 at 22:12:35 From inside which jordan site and was fertile land and Usara was.
07.06.2021 at 17:53:22 Fishing boats in freshwaters also features.