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When an acid is dissolved in water, it dissociates hydrogen. Similarly a base dissociates hydroxide ion in water. The range of pH scale is between 0 to The pH value increases with decrease in hydrogen ion concentration.

Type of Indicator: There are many types of indicators. Some common types of indicators are. Indicators obtained from natural sources are Ch 21 Class 10 Maths Icse 03 called natural indicators. Litmus, turmeric, etc. Litmus: It is obtained from lichens. The solution of litmus is purple in colour. When we add acid to litmus solution, it Ch 21 Class 10 Maths Icse 03 turns to red. And when we add base to litmus solution, it turns to blue. Turmeric: Turmeric is yellow in colour.

Turmeric solution or paper turns reddish brown with base. It does not change colour with acid. Indicators that are synthesized in laboratory are known as synthetic indicators. For example; phenolphthalein, methyl orange, etc. Methyl Orange: 21 Maths Class 10 Ch Icse 03 Ch 21 Class 10 Maths Icse 03 It is used to show acidic and basic behavior of substance.

It is originally orange in colour. It turns to red with acid and turns to yellow with base. Phenolphthalein: It is also an indicator. It is a colourless liquid. Phenolphthalein remains colourless with acid but turns to pink with base. Substances which change their smell when Ch 21 Class 10 Maths Icse 03 Ch 21 Class 10 Maths Icse 03 mixed with acid or base are known as olfactory indicators. For example onion, vanilla, clove, etc. Onion: Paste or juice of onion loses its smell when added with Ch 21 Class 10 Maths Icse 03 base.

It does not change its smell with acid. Using a litmus paper, phenolphthalein, methyl orange, etc. So, to get the strength as well as acidic and basic Ch 21 Class 10 Maths Icse 03 Ch 21 Class 10 Maths Icse 03 nature of a given solution, universal indicator is used. When we add cabbage juice in different substances of different pH value, their colour get change. If substance is Ch 21 Class 10 Maths Icse 03 Ch 21 Class 10 Maths Icse 03 highly acidic, its colour turns to red.

If substance is highly basic, its colour turns to yellow. If substance is neutral in nature, solution remain bluish in colour. When we start eating, our body produces strong dilute hydrochloric acid HCl to begin the process of digestion. Normally, your body produces just the amount of HCl and other chemicals it needs for digestion. But, under certain conditions, our stomach starts producing more HCl acid.

Too much stomach acid can cause pain and irritation. This problem is Ch 21 Class 10 Maths Icse 03 Ch 21 Class 10 Maths Icse 03 Ch 21 Class 10 Maths Icse 03 Ch 21 Class 10 Maths Icse 03 Ch 21 Class 10 Maths Icse 03 called acidity. At that point, we may have to take medicines called antacids that decrease the amount of active HCl in your stomach.

Antacids are actually anti acids Ch 21 Class 10 Maths Icse 03 or we can say basic in nature which neutralize acids in stomach and we feels good. Our mouth is full of bacteria. Some bacteria are helpful. But some can be harmful such as those that play a role in the tooth decay process. Tooth decay is the result of an infection with certain types of bacteria. These Ch 21 Class 10 Maths Icse 03 bacteria use sugars in food to make acids. Over time, these acids can make a cavity in the tooth. Toothpaste is used to protect our teeth from those acids. Toothpaste is basic in nature which neutralizes the acids and thus protects our teeth.

This is highly acidic. Due to acid rain, acid reaches into oceans, lakes and affects the life of aquatic animals and plants. Some aquatic animals and plants are died due to acid rain and some plants lose lots of their leaves.Ch 21 Class 10 Maths Icse 03 Ch 21 Class 10 Maths Icse 03

To neutralize this acidic behavior of lakes and oceans, calcium carbonate CaCO 3 is added into it. A dry acid does not dissociate in hydrogen ions. When we Ch 21 Class 10 Maths Icse 03 Ch 21 Class 10 Maths Icse 03 dissolve it with water, then it shows the acidic behavior.

For example, dry hydrochloric acid gas does not change the colour of blue litmus paper to red because a dry acid does not dissociate hydrogen ion. This is the cause that a moist litmus paper is used to check the acidic or basic character of a gas. Similarly at room temperature, sodium hydroxide is in the form of solid.

So as a solid, NaOH does not dissociate into hydroxide ion. When we dissole it Icse Maths 03 Ch 21 Class 10 with water, then it shows its basic behavior. Salts are the ionic compounds which are produced after the neutralization reaction between acid and base. Similarly when salt is dissolved in water, it ionizes to form ions. And these ions are responsible to conduct electricity same as in the case of acids and bases. Salts produced because of reaction between strong acid and strong base are neutral in nature.

The pH value of such salts is equal to 7, i. Salts which are formed after the Ch Icse 10 Class Maths 03 21 Ch 21 Class 10 Maths Icse 03 reaction between weak acid and strong base are called basic salt. The pH value of acidic salt is greater than 7. Salts which are formed after the reaction between a strong acid and weak base are called acidic salt.

The pH value of acidic salt is lower than 7. Many salts contain water molecule and are Ch 21 Class 10 Maths Icse 03 known as hydrated salts. The water molecules present in salt is known as water of crystallization. For example; copper sulphate pentahydrate CuSO 4.

The green colour of ferrous 21 Ch 03 Class Maths Icse 10 sulphate heptahydrate; commonly known as ferrous sulphate; is due to the presence of 7 molecules of water in it. Plaster of Paris is used in making of toys, Ch 21 Class 10 Maths Icse 03 designer false ceiling, etc. Doctors use Plaster of Paris to set the fractured bone. Sodium chloride NaCl is also known as common salt or table salt. It is 03 Ch 21 Class 10 Icse Maths formed after the reaction between sodium hydroxide and hydrochloric acid. Hydrogen gas is used as fuel, margarine, in making of ammonia for fertilizer, etc.

It is also used in manufacturing of bleaching powder and hydrochloric acid. Sodium hydroxide is used in de-greasing of metals, manufacturing of paper, soap, detergents, artificial fibres, bleach, etc. Bleaching powder is also Ch 21 Class 10 Maths Icse 03 known as chloride of lime.

It is a solid and yellowish white in colour. Bleaching powder can be easily identified by the strong smell of chlorine. When calcium hydroxide slaked lime reacts with chlorine, it gives calcium oxychloride bleaching powder and water is formed.

The term bleach means removal of colour. Bleaching powder is often used as bleaching agent. It works because of oxidation. Chlorine in the bleaching powder is responsible for bleaching effect.

Baking soda is another important product which can be obtained using byproducts of chlor-alkali process. The chemical name of baking soda is sodium hydrogen carbonate NaHCO 3 or sodium bicarbonate. Bread soda, cooking soda, bicarbonate of soda, sodium bicarb, bicarb of soda or simply bicarb, etc. Baking soda is obtained by the reaction of brine with carbon dioxide and ammonia.

This is known as Solvay process. In Ch 21 Class 10 Maths Icse 03 this process, calcium carbonate is used as the source of CO 2 and the resultant calcium oxide is used to recover ammonia from ammonium chloride. Sodium carbonate formed after thermal decomposition of sodium hydrogen carbonate; decomposes into sodium oxide and carbon dioxide on further heating.

Baking powder produces carbon dioxide on heating, so it is used Ch 21 Class 10 Maths Icse 03 in cooking to make the batter spongy. Although baking soda also produces carbon dioxide on heating, but it is not used in cooking because on heating; baking soda produces sodium carbonate along with carbon dioxide. The sodium carbonate; thus produced; makes the taste bitter.

Baking powder is the mixture of baking soda and a mild edible acid. Generally, tartaric acid is mixed with baking soda to make baking powder. When baking powder mixture of baking soda and an edible acid is heated, the sodium Ch 21 Class 10 Maths Icse 03 carbonate formed because of heating of baking soda neutralizes after reacting with tartaric acid and sodium tartarate salt is formed.

The smell of sodium tartarate is pleasant and Ch 21 Class 10 Maths Icse 03 taste is good. This makes the cake or any other food tasty. Sodium carbonate is manufactured by the thermal decomposition of sodium hydrogen carbonate obtained by Solvay process. The sodium carbonate obtained in this process is dry. It is called soda ash or anhydrous sodium carbonate. Washing soda is obtained by rehydration of anhydrous sodium carbonate.

Since 03 10 Ch Class 21 Icse Maths there are 10 water molecules in washing soda, hence it is known as Sodium bicarbonate decahydrate. Sodium carbonate is a crystalline solid and it is soluble in water Ch 21 Class 10 Maths Icse 03 when most of the carbonates are insoluble in water. Bases in which complete dissociation of hydroxide ion takes place are called strong base. In alkali; complete dissociation of Ch 21 Class 10 Maths Icse 03 Ch 21 Class 10 Maths Icse 03 hydroxide ions takes place so they are considered as strong base. But it is not perfectly well defined that which substance is consider in category of Alkali and which is not.

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April 13, at pm Reply. April 11, at pm Ch 21 Class 10 Maths Icse 03 Reply. Sanjukta Paul. March 16, at am Reply. Abhishek Singh. March 14, at pm Reply. March 13, at am Reply. NCO Result. ICO Result. Answer: The roll number 10 Class Maths Ch 03 Icse 21 is given on the admit card, students can get it from there.

You can download previous year question papers of NSO by visiting our page the link for the same is provided below. You can download previous year question papers of IMO by visiting our page the link for the same is provided below. These papers will help you to understand the examination pattern, types of questions which are asked in exam, difficulty level of the examination, you will also get an idea of the important topics which are covered in the exam by practising them so that you can accordingly prepare for the exam , you will also get to know your preparation 21 Class 03 Maths 10 Ch Icse level.

I assume you are asking about national science Olympiad exam conducts by science Olympiad foundation every year, candidates who are studying from class are eligible to participate Ch 21 Class 10 Maths Icse 03 in this olympiad competition. I am sorry.

The results of NSO Level 1 have been published and are available on their official site link given below. When you look back in life , this app would have played a huge role in laying the foundation of your career decisions. Found everything I wanted and it solved all of my queries for which I was searching a lot A must visit No need to find colleges in other sites, this is the best site in India to know about any colleges in India.

Updated on Mar 22, - p. Table of contents. Priority level Section 1 Achiever's Section 2 Science. Question: When NSO results 03 10 Class Icse Ch Maths 21 will be declared? Question: Is there negative marking in NSO? Answer: No, there is no negative marking in the NSO exam. Question: How many levels are there in 03 Maths 21 Class Ch 10 Icse NSO? Answer: There are two levels in the NSO exam. Latest Articles. Read More. View All News and Articles.

Questions related to NSO. Showing 35 out of 35 03 Class 10 Icse Ch 21 Maths Ch 21 Class 10 Maths Icse 03 Questions. Dear student, If you miss the NSO by sof then nothing can be done. Because if you miss then you cannot be able to give the exam again. So, you should be very aware of the dates and timings of that exam. So, if you miss then you can give in next year for that Ch 21 Class 10 Maths Icse 03 Ch 21 Class 10 Maths Icse 03 Ch 21 Class 10 Maths Icse 03 particular class.

Also note that, this sof Olympiad is just for the testing skill of the student for a particular class that whether he or she is fully Ch 21 Class 10 Maths Icse 03 prepared mentally and technically. And yes, if you miss them your registration fees will be wasted too.

But instead of this there are many good Olympiads than sof. You 03 Icse 21 Class Ch Maths 10Ch 21 Class 10 Maths Icse 03 ng> can also give RMO regional mathematics Olympiad. Answer later.

Aditya Kumar Student Expert 7th Dec, Manidipa Kundu Student Expert 30th Jul, Manidipa Kundu Student Expert 28th May, Sai Ch 21 Class 10 Maths Icse 03 Sri Nandan Ch 24th Feb, Hello, I am sorry. Hence, I wont be checking your results.

The results of NSO Level 1 have been published and are available on their official site link given below Enter your roll number and and answer a simple question to view your result. View All Questions.

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