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NCERT Solutions for Class 10

Question 1: Why are decomposition reactions called the opposite Ncert 9th And 10th Science Book Sale of combination reactions? Lorem lpsum 337 boatplans/price/maths-10th-ncert-36-kit Here equations for these reactions. Answer: In a combination reaction two or more substances are combined to form new substance while in the decomposition reaction one substance decomposes into two or more substances. Hence, the decomposition reactions are called opposite of combination reactions.

Question 2: Write one equation each for decomposition reactions where energy is supplied in the form of heat, light or electricity. Question 3: What is the difference between displacement and double displacement reactions? Answer: When 10th ncert chemical reactions and equations answers ii more reactive element displaces a less reactive element from its salt solution, 10th Ncert Chemistry Notes And Pdf then it is called displacement reaction. While there is an exchange of ions between the reactants to produce new substances, it is called double displacement reaction.

In displacement reaction one displacement takes place. While in double displacement reaction two displacements takes place. Following are examples of displacement 10th ncert chemical reactions and equations answers ii and double displacement reaction.

Question 4: In the refining of silver, the recovery of silver from silver nitrate solution involved displacement by copper metal. Write down the reaction involved. Question 5: What do you mean by a precipitation reaction?

Explain by giving examples. Answer: Reactions in which precipitate is formed are called precipitation reactions. Generally in a precipitation reaction insoluble salts are settled down as precipitate. In the above reaction, when sodium sulphate reacts with barium chloride, the white precipitate of barium sulphate is formed along with the sodium chloride.

Answer: Oxidation: When a substance gains oxygen or loses hydrogen during a reaction, it is called that the substance is oxidized. This phenomenon is called oxidation. In the following reaction, copper gets oxygen and hence is oxidised. Reduction: If a substance loses oxygen or gains hydrogen during a reaction, it is that the substance is reduced. This phenomenon is called reduction. In the following reaction zinc loses oxygen, and hence Ncert Solutions Class 10th Real Numbers And called is reduced.

In this reaction Mangnese dioxide Lorem lpsum 337 boatplans/fishing-boats-sale/fishing-boats-for-sale-europe ��������� fishing boats for sale europe ���������� oxygen and hence is manganese dioxide is said to be reduced.

Answer: Copper is a brown coloured shiny element. When 10th ncert chemical reactions and equations answers ii in air, it becomes black in colour. Answer: When articles made of iron come in contact with the moisture present in air, it forms iron oxide, which 10th ncert chemical reactions and equations answers ii known as rust.

Hence, paint is applied to prevent an iron article to come in contact with moisture present in air. Paint prevents rusting of iron. Answer: When fats and oils are oxidised, they become rancid and their smell and taste change.

This phenomenon is called rancidity. Hence, food items containing oil and fat are flushed with nitrogen which prevents them to get oxidized and becoming rancid. Question Explain the following terms with one example each: a Corrosion b Rancidity. Answer: Corrosion: Metals react with oxygen which is present in the atmospheric moisture.

This leads to formation of metal oxides. In due course of time, metal keeps on changing into its oxide and finally the whole metal is lost due to oxidation. This process is called corrosion. Example: Iron articles; like iron gates or bridges tend to rust because of oxidation by atmospheric moisture. We know that rust is nothing but iron oxide. Conversion of iron into rust leads to corrosion of the iron articles. Due to this, iron articles weaken and finally wither away.

Rancidity: When fats and oils are Ncert Solutions Class 10th Heredity And Evolution Network oxidised, their smell and taste change. This process is called rancidity. Oily food often become rancid and start giving out obnoxious smell. Lorem lpsum 337 boatplans/boat-trailer/bass-boat-trailer-repair-work ����� bass boat trailer repair work ������ taste also becomes bad.

Such oily food is not fit for eating. Example: When packets of potato chips or other oily snacks are kept open for a long time; their taste and smell become bad. The oily food is no longer safe to eat. Question 6: Explain the following: a Oxidation b Reduction Answer: Oxidation: When a substance gains oxygen or loses hydrogen during a reaction, it is called that the substance is oxidized.

Question 8: Why do we apply paint on iron articles? Question 9: Oil and fat containing food items are flushed with nitrogen. Question Explain the following terms with one example each: a Corrosion b Rancidity Answer: Corrosion: Metals react with oxygen which is present in the atmospheric moisture.

Question 2 What are the two properties of carbon which lead to the huge number of carbon compounds we see around us? Answer: d All esters have the common structure of carboxylic group represented by the suffix date. Assertion: Magnesium ribbon keeps on burning in atmosphere of nitrogen. Solution: Question 2 What would be the electron dot structure of a molecule of sulphur, which is made up of eight atoms of sulphur? For example, methane has a lower boiling point than ethane since it has more intermolecular forces with neighbouring molecules. The process of hydrogenation takes place in the presence of nickel Ni or palladium Pd metals as catalyst. It makes good impression if you score good marks in Class 10 Board Exam.
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