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Going through the step-wise solutions for every question too is highly important to bag a good score. Also in this article, you will find the Step-wise explanation for each and every question.

Going through them will help you in getting a better understanding of how to solve problems. Question 1 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 ncert solutions for class 10th history chapter 2 act Answer: i Put the red litmus paper in all the test tubes, turn by turn.

The solution which turns red litmus to blue will be a basic solution. The blue litmus paper formed here can now be used to test the acidic solution. The solution which turns the blue litmus paper to red will be the acidic solution. Question 1 Why should curd and sour substances not be kept in brass and copper vessels?

Answer: Curd and sour substances should not be kept in brass and copper vessels because these and other sour food-stuffs contain acids which can react with the metal of the vessel to form poisonous metal compounds which can cause food poisoning and affect our health adversely.

Question 2 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?

Answer: i Hydrogen H 2 gas is liberated when an acid reacts with a metal. Take some zinc granules in the test tube. Add about 5 mL dilute hydrochloric acid slowly.

Soon the reaction between zinc and hydrochloric acid starts and hydrogen gas is evolved. When passed through soap solution, it gets trapped into bubbles. Bring a burning candle near the soap bubble filled with gas.

The soap bubble bursts and hydrogen gas burns with a pop sound. Question 3 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.

Answer: As the end product is calcium chloride and the gas formed is carbon dioxide, the metal compound A must be calcium carbonate. Therefore, the reaction between calcium carbonate and hydrochloric acid is. Question 1 Why do HCl, HNO 3etc show acidic characters in aqueous solutions while solutions of compounds like alcohol and glucose do not show acidic character?

HCl, HNO 3. Therefore, alcohol and glucose do not show acidic character. Question 2 Why does an aqueous solution of an acid conduct electricity? Answer: The aqueous solution of an acid conducts electricity due to the presence of charged particles called ions in it. Question 3 Why does dry HCl gas not change the colour of the dry litmus paper?

Question 4 While diluting an acid, why is it recommended that the acid should be added to water and not ncert solutions for class 10th history chapter 2 act to the acid?

Answer: While diluting an acid it is recommended that the acid should be added to water and not water to the ncert solutions for class 10th history chapter 2 act because if water is added to concentrated acid to dilute it, then a large amount of heat is evolved at.

Answer: When a given amount of an acid is added to water, there is a fixed number of hydronium ions per volume of the solution. On dilution, the number of hydronium ions per volume decreases and concentration decreases. Question 6 How is the concentration of hydroxide ions OH � affected when excess base is dissolved in a solution of sodium hydroxide?

Answer: The concentration of hydroxide ions will ncert solutions for class 10th history chapter 2 act when excess base is dissolved ncert solutions for class 10th history chapter 2 act a solution of sodium hydroxide, but it happens to a limited extent only after which the concentration becomes almost constant. Question 1 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?

Answer: A pH value of less than 7 indicates an acidic solution, while greater than 7 indicates a basic solution. Since solution A has more hydrogen ion concentration, solution A is acidic and solution B is basic. If yes, then why are these basic? But these are far less in number than OH � ions that is responsible for their basic nature.

Question 4 Under what soil condition do you think a farmer would treat the soil of his fields with quick lime calcium oxide ncert solutions for class 10th history chapter 2 act slaked lime calcium hydroxide or chalk calcium carbonate?

Answer: If the soil is too acidic having low pH then it is treated ncert solutions for class 10th history chapter 2 act materials like quick lime calcium oxide or slaked lime calcium hydroxide or chalk calcium carbonate. Question 1 What is the common name of the compound CaOCl 2? Answer: Bleaching powder. Question 2 Name the substance which on treatment with chlorine yields bleaching powder. Answer: Slaked lime Ca OH 2.

Question 3 Ncert solutions for class 10th history chapter 2 act the sodium compound which is used for softening hard water. Answer: Sodium carbonate. Question 4 What will happen if a solution of sodium hydrogen carbonate is heated. Give the equation of the reaction involved?

Answer: Solution of sodium hydrogen carbonate on heating gives sodium carbonate and carbon dioxide gas is evolved.

Question 5 Write an equation to show the reaction between plaster of Paris and water. Question 1 A solution turns red litmus blue, its pH is likely to be a 1 b 4 c 5 d 10 Answer: d Question 2 A solution reacts with crushed-egg shells to give a gas that turns lime water milky.

Question 4 Which one of the following types of medicines is used for treating indigestion? Question 6 Compounds such as alcohol and glucose also contain hydrogen but are not categorised as acids. Describe an activity to prove it. The bulb does not glow in this case. This shows that alcohols and glucose are not acids. Question 7 Why does distilled water not conduct electricity, whereas rainwater does? Answer: Distilled water does not conduct electricity because it does not contain any ionic compound like acids, bases or salts dissolved in it.

Rainwater, while falling to the earth through the atmosphere, dissolves an acidic gas carbon dioxide from the air and forms carbonic acid H 2 CO 3. Hence, due to ncert solutions for class 10th history chapter 2 act presence of carbonic acid which provides ions to rainwater, the rainwater conducts electricity. Question 8 Why do acids not show acidic behaviour in the absence of water? The acid produces hydrogen ions only in the presence ncert solutions for class 10th history chapter 2 act water.

So in the absence of water, an acid will not form hydrogen ions and hence will not show its acidic behaviour. Which solution is a Neutral b Strongly alkaline c Strongly acidic Ncert Solutions For Class 10th History Chapter 7 Error d Weakly acidic e Weakly alkaline Arrange the pH in increasing order of hydrogen ion concentration. Question 10 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? Answer: Fizzing will occur more vigorously in test tube A. Being strong acid, the hydrochloric acid solution contains a much greater amount of hydrogen ions in it due to which the fizzing will occur more vigorously in test tube A containing hydrochloric acid. The fizzing is due to the evolution of hydrogen gas which is formed by the Ncert Solutions For Class 10th History Chapter 3 Review action of acid on the magnesium metal Ncert Solutions For Class 10th History Chapter 3 World of magnesium ribbon.

Question 11 fresh milk has a pH of 6. How do you think the pH will change as it turns into curd? Explain your answer. Answer: pH of milk falls below 6 as it turns into curd due to the formation of lactic acid during this process. Lactic acid present in it reduces its pH value. Question 12 A milkman adds a very small amount of baking soda to fresh milk.

Answer: a Milk is made slightly alkaline so that it may not get sour easily due to the formation of lactic acid in it. Question 13 Plaster of Paris should be stored in Ncert Solutions For Class 10th History Chapter 3 Student a moisture proof container. Explain why? Answer: Plaster of Paris should be stored in a moisture proof container because the presence of moisture can cause slow setting of plaster of Paris by bringing about its hydration.

This will make the plaster of Paris useless after. Question 14 What is a neutralisation reaction? Give two examples. Answer: The reaction between an acid and a base to form salt and water is called a neutralisation reaction.

Question 15 Give two important uses of washing soda and baking soda. Answer: Uses of washing soda : i Washing soda is used in glass, soap and paper industries. Uses of baking soda : i Baking soda is used as an antacid in medicines to remove acidity of the stomach.

One of them contains distilled water and the other two contain an acidic solution and a basic solution respectively. Solution: The contents of each test tube would be identified by change in colour of red litmus paper. For example, when we wet the red litmus paper with the basic solution, it changes into blue colour.

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The French needed an educated local labour force: a To be loyal to them b To understand them better c But they feared that education might create problems. Vietnamese may not convert into Christians. Answer: c But they feared that education might create problems. The French needed an educated local labour force but they feared that education might create problems. In , in a population of 17 million: a there were less than who passed the examination.

Answer: b There were less than who passed the examination. There were less than who passed the examination. Answer: a To provide a Western-style education. It was started to provide a Western-style education. Schools in Vietnam became an: a Important place for education. Answer: c Important place for political and cultural battles.

Schools in Vietnam became an important place for political and cultural battles. In , the modern part of Hanoi was struck by: a famine b drought c bubonic plague d US bombs. Defeated by the resistance of the weak: a The Chinese were forced to scrap the bounty programme. Answer: c The French were forced to scrap the bounty programme. The French were forced to scrap the bounty programme.

Answer: b Buddhism, Confucianism and local practices. An early movement against French control and the spread of Christianity was the: a Students Revolt in b Teachers Revolt in c Scholars Revolt in d none of the above.

Indentured labour refers to a form of labour widely used in the plantations from the mid-nineteenth century. The Vietnamese intellectuals feared that Vietnam was losing not just control over its territory but its very identity. An early movement against French control and the spread of Christianity was the Scholars Revolt in Most important outcome of the French Revolution of was a the abolition of absolute monarchy.

Identify and mark the incorrect response. A large number of people were hostile to the Napoleonic code because a it was not suitable for all. For the middle class of Europe, the most important feature of Liberalism was a abolition of conservatism.

Why did the Frankfurt Parliament fail to achieve its goal? Solution: Giuseppe Mazzini was an Italian politician, journalist and activist for the unification of Italy and spearheaded the Italian revolutionary movement. His efforts helped bring about the independent and unified Italy in place of several separate states, many dominated by foreign powers. He also helped define the modern European movement for popular democracy in a republican state.

Mazzini was a fervent advocate of republicanism and envisioned a united, free and independent Italy. Unlike his contemporary Garibaldi, who was also a republican, Mazzini never compromised his republican ideas and refused to swear an oath of allegiance to the House of Savoy. Mazzini was the spiritual force of the Italian resurrection.

He joined the Carbonari, a revolutionary organisation and was arrested in He was sent into exile in for attempting a revolution in Liguria. He subsequently founded two more underground societies, first � Young Italy in Marseilles and then Young Europe in Berne, whose members were like- minded young men from Poland, France, Italy and the German states. Mazzini believed that God had intended nations to be the natural units of mankind.

So Italy could not continue to be a patchwork of small states and kingdoms. It had to be forged into a single unified republic within a wider alliance of nations. This unification alone could be the basis of Italian liberty. Mazzini was in favour of a republic because he thought sovereignity resides essentially in the people and can only completely express itself in that form. Mazzini failed in his objects because he himself lacked some of the qualities of practical leadership.

He underestimated the strength of the opposition. But in spite of these drawbacks he is one of the chief makers of Italy. He was responsible for the growth of patriotism for a country that existed as yet only in the imagination.

Solution: Cavour was a realist who practiced realistic politics. Cavour used international power to achieve his domestic goals. He devoted himself to the liberation of northern Italy from Austrian domination. A brilliant and steadfast diplomat, he played a leading role in the unification of Italy. He was distrustful of the reactionary politics in force throughout Europe, particularly their manifestation in the repressive rule of Austria over a large area of Italy.

He became Prime Minister of Piedmont in He reorganized its army and it achieved rapid growth in material prosperity. Through a tactful diplomatic alliance with France, Sardinia-Piedmont succeeded in defeating the Austrian forces in Apart from regular troops, a large number of armed volunteers under the leadership of Giuseppe Garibaldi joined the fight.

In , they marched into South Italy and the Kingdom of Two Sicilies and with the support of the local peasants drove out the Spanish rulers. He, however, died on June 6, , before the completion of the unification of Italy in Although Cavour was neither a revolutionary nor a democrat he played an important role in the unification of Italy.

Events: Greece had been part of the Ottoman Empire since the 15th century. The growth of revolutionary nationalism in Europe sparked off a struggle for independence among st the Greeks which began in The object of the struggle was to expel Turks from Europe and to establish old Greek eastern empire.

Nationalists in Greece were supported by other Greeks living in exile and many West European countries. Poets and artists lauded Greece as the cradle of European civilisation. They mobilised public opinion to support its struggle against a Muslim empire. The English poet Lord Byron organised funds and later went to fight in the war. Ultimately, the Treaty of Constantinople of recognised Greece as an independent nation. Its independence was guaranteed by Russia, England and France.

Solution: Frankfurt Parliament was convened at Frankfurt on May 18, as a result of the liberal revolution that swept the German states early in The parliament was called by a preliminary assembly of German liberals in March and its members were elected by the direct manhood suffrage.

They represented the entire political spectrum and included the foremost German figures of that time. Its purpose was to plan the unification of Germany. The conflict among the traditionally separate German states, notably Austria and Prussia made progress difficult.

In March the parliament adopted a federal constitution of German states, excluding Austria, with a parliamentary government and a hereditary emperor.

Frederick William IV of Prussia was chosen emperor but he refused to accept the crown from a popularly elected assembly and the entire scheme failed. Most of the representatives withdrew and the remainder were dispersed.

This commission consisted of seven members and its Chairman was Sir John Simon. The objective of the Commission was to look into the functioning of the constitutional system in India and suggest some constitutional changes. But nationalists in India opposed the Commission because it had no Indian member. The Congress and the Muslim League jointly demonstrated against it. Question 4: Compare the images of Bharat Mata in this chapter with the image of Germania in Chapter 1.

Question 1. List all the different social groups which joined the Non-Cooperation Movement of Then choose any three and write about their hopes and struggles to show why they joined the movement.

Answer: The different social groups that joined the Non-Cooperation Movement of were the urban middle class comprising lawyers, teachers and headmasters, students, peasants, tribals and workers. Question 2. Discuss the Salt March to make clear why it was an effective symbol of resistance against colonialism.

Answer: The Salt March was an effective symbol of resistance against colonialism because:. Question 3.





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Ncert Solutions For Class 10th History Chapter 2 Act