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NCERT Solutions for Class 10 English Chapter 2 - Long Walk To Freedom

You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. If you are given only red litmus paper, how will you identify the contents of each test tube?

If the colour of red litmus does not change then it is acid. If the colour of red ncert solutions class 10th english chapter 2 student changes to blue then it is base.

If there is slight change in the colour of red litmus such as purple then it is distilled water. Curd and other sour substances contain acids. Therefore, when they are kept in brass and copper vessels, the metal reacts with the acid to liberate hydrogen gas and harmful products, thereby spoiling the food.

Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas? Take few pieces of zinc granules and add 5 ml of dilute H2SO4. Shake ncert solutions class 10th english chapter 2 student and pass the gas produced into a soap solution. The bubbles of the soap solution are formed. These soap bubbles contain hydrogen gas. Metal compound A reacts with dilute hydrochloric acid to produce effervescence.

The gas evolved extinguishes a burning candle. Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride.

For example just see the following reactions. When alcohols and glucose are mixed with water then they do not dissolve to form ions. Hence they do not show acidic character. While diluting an acid, why is it recommended that the acid should be added to water and not water to the acid?

Since the process of dissolving an acid in water is exothermic, it is always recommended that acid should be added to water. If it is done the other way, then it is possible that because of the large amount of heat generated, the mixture splashes out and causes burns. This means that the strength of the acid decreases. You have two solutions, A and B. The pH of solution A is 6 and pH of solution B is 8.

Which solution has more hydrogen ion concentration? Which of this is acidic and which one is basic? A pH value of less than 7 indicates an acidic solution, while greater than 7 indicates a basic solution. However, their concentration is less as compared to the concentration of OH � ions that makes the solution basic. Under Ncert Solutions Of Class 10th English Chapter Amanda Instagram what soil condition do you think a farmer would treat the soil of his fields with quick lime calcium oxide or slaked lime calcium hydroxide or chalk calcium carbonate?

If the soil is acidic and improper Ncert Solutions Of Class 10th English Chapter 2 Question for cultivation, then to increase the basicity of soil, the farmer would treat the soil with quick lime or slaked lime or chalk. Name the substance Lorem lpsum 337 boatplans/class-maths/ch-1-class-10-maths-formula-utility please click for source on treatment with chlorine yields bleaching powder?

Name the sodium compound which is used for softening hard water. What will happen if a solution of sodium hydrocarbonate is heated? Give the equation of the reaction involved. When sodium hydrogen carbonate is heated then Ncert Solutions Of Class 10th Maths Chapter 3 Exercise 3.6 English sodium carbonate and water is formed along with the evolution of carbon dioxide gas. A solution reacts with crushed egg-shells to give a gas that turns lime-water milky.

The solution contains a NaCl. If we take 20 mL of the same solution of NaOH, the amount of HCl solution the same solution as before required to neutralise it will be a 4 mL. Which one of the following types of medicines is used for treating indigestion?

Compounds such as alcohols and glucose also contain hydrogen but are not categorized as acids. Describe an activity to prove it. Two nails are fitted on a cork and are kept it in a mL beaker. The nails are then connected to the two terminals of a 6-volt battery ncert solutions class 10th english chapter 2 student a bulb and a switch.

Some dilute HCl is poured in Lorem lpsum 337 boatplans/sailboat/making-a-paddle-mixer-uk ��� making a paddle mixer uk ����� beaker and the current is switched on. The same experiment is then Lorem lpsum 337 boatplans/fishing-boats-sale/commercial-fishing-boats-for-sale-queensland-vietnam commercial boats for sale vietnam with glucose solution and alcohol solution.

Observations: It will be observed that the bulb glows in the HCl solution and does not glow in the glucose solution. These ions conduct electricity in the solution resulting in the glowing of the bulb. On the other hand, the glucose solution does not dissociate into ions. Therefore, it does not conduct electricity.

Conclusion: From ncert solutions class 10th english chapter 2 student activity, it can be concluded that all acids contain hydrogen but not all compounds containing hydrogen are acids. That is why, though alcohols and glucose contain hydrogen, they are not categorised as acids. Why does distilled water not conduct electricity, whereas rain water does? Distilled water cannot conduct electricity because it does not contain ions while rain water conducts electricity as it contains ions due presence of dissolved salts in it.

Acids do not show acidic behaviour in the absence of water because the dissociation of hydrogen ions from an acid occurs in the presence of water.

Which solution is a neutral? Arrange the pH in increasing order of hydrogen-ion concentration. Equal lengths of magnesium ribbons are taken in test tubes A and B. In which test tube will the fizzing occur more vigorously and why? The fizzing will occur strongly in test tube A, in which hydrochloric acid HCl is added. Fresh milk has a pH of Lorem lpsum 337 boatplans/diy/diy-pvc-boat-ladder-light click to see more. How do you think the pH will change as it turns into curd?

Explain your answer. The pH of milk is 6. As it changes to curd, the pH will reduce because curd is acidic in nature. The acids present in it decrease the pH. A milkman adds a very small amount of baking soda to fresh milk.

Therefore, it takes a longer time for the curd to set. The Plaster of Paris should be stored in ncert solutions class 10th english chapter 2 student moisture-proof container as it absorbs water from moisture and turn Lorem lpsum 337 boatplans/wooden-kitchen/wooden-modular-kitchen-maker learn more here hard substance Gypsum as shown in following ncert solutions class 10th english chapter 2 student Lorem lpsum 337 boatplans/lights/nitro-bass-boat-trailer-lights-classic link. A reaction in which an acid and base react with each other to give a salt and water is termed as neutralization reaction.

Baking powder is a mixture of baking soda and a mild acid known as tartaric acid. When it is heated or mixed in water, it releases CO2 that makes bread or cake fluffy. Your email address will not be published. This site uses Akismet to reduce spam.

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