Ncert Solutions Class 10th Exercise 2.2 Word,Rhino Liner Paint For Boats 400,520 Ranger Bass Boat For Sale Data - Easy Way
My White picket Vessel Plans Please word which Nothing of my skeleton need lofting. Which clxss essentially Lorem lpsum 349 boatplans/book/10th-cbse-english-ncert-solutions-vis click appealing. Overlay it over itself to emanate a despotic .
Solution: Curd and other sour foodstuffs contain acids, which can react with the metal of the vessel to form poisonous metal compounds which can cause food poisoning and damage our health. Question 3 Which gas is usually liberated when an acid reacts with a metal? Solution: When an acid reacts with metal, a salt and hydrogen gas is formed. Question 4 Metal compound A reacts with dilute hydrochloric acid to produce effervescence.
Solution: The gas that extinguishes a burning candle is carbon dioxide, which is formed by the action of dilute hydrochloric acid on a metal carbonate and produces effervescence. Now, since one of the compounds formed is calcium chloride, it shows that the metal compound is calcium carbonate. Thus, the metal compound A is calcium carbonate CaCO 3. Calcium carbonate reacts with dilute hydrochloric acid to form calcium chloride, carbon dioxide and water. This can be written as:.
The compounds such as glucose and alcohol also contain hydrogen but they do not show acidic character. Question 6 Why does an aqueous solution of acid conduct electricity? Solution: The aqueous solution of an acid conducts electricity due to the presence of charged particles called ions in it.
Question 7 Why does dry HCl gas not change the colour of the dry litmus paper? Solution: Dry HCl gas does not contain any hydrogen ions in it, so it does not show acidic behaviour. Question 8 While diluting an acid, why is it recommended that the acid should be added to water and not water to the acid?
Solution: Diluting an acid should be done by adding concentrated acid to water gradually with stirring and not by adding water to concentrated acid. The heat is evolved gradually when a concentrated acid is added to water for diluting an acid and the large amount of water is easily absorbed. If, however, water is added to concentrated acid to dilute it, a large amount of heat is evolved at once.
The heat generated may cause the mixture to splash the acid on our face or clothes and cause acid burns. Question 10 How is the concentration of hydroxide ions OH- affected when excess base is dissolved in water?
Solution: When the solution of a base is diluted by mixing more water in it, the concentration of hydroxide ions OH � ions per unit volume decreases.
Question 11 You have two solutions A and B. Solution: The pH of a solution is inversely proportional to its hydrogen ion concentration. This means that the solution having lower pH will have more hydrogen ion concentration. In this case, solution A having a lower pH of 6 will have more hydrogen ion concentration. Solution A is acidic and solution B is basic. Solution: Acids produce hydrogen ions in water. So, when an acid is added to water, the concentration of hydrogen ions in water increases.
The solution of acid thus formed will have more of hydrogen ions and it will be acidic in nature. If yes, why are these basic? Question 14 Under 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?
Solution: Most often the soil in the fields is too acidic. If the soil is too acidic having low pH , it is treated with materials like quicklime calcium oxide or slaked lime calcium hydroxide or chalk calcium carbonate.
Thus, a farmer should add lime or slaked lime in his fields when the soil is too acidic. Question 15 What is the common name of the compound CaOCl 2? Solution: The common name of the compound CaOCl 2 is bleaching powder. Question 16 Name the substance that on treatment with chlorine yields bleaching powder. Solution: Calcium hydroxide is the substance that on treatment with chlorine yields bleaching powder. Question 17 Name the sodium compound, which is used, for softening hard water. Solution: Sodium carbonate washing soda is used for softening hard water.
Question 18 What will happen if a solution of sodium hydro carbonate is heated? Give the equation of the reaction involved. Sodium carbonate and carbon dioxide are evolved when sodium hydro carbonate is heated. Question 19 Write an equation to show the reaction between plaster of Paris and water. Solution: Plaster of Paris has a very remarkable property of setting into a hard mass on wetting with water. So, when water is added to plaster of Paris, it sets into a hard mass in about half an hour.
The setting of plaster of Paris is due to the hydration crystals of gypsum, which set to form a hard, solid mass. Question 20 Why does distilled water not conduct electricity, whereas rainwater does? Solution: Distilled water does not conduct electricity because it does not contain any ionic compound like acids, bases or salts dissolved in it. On the other hand, rain water conducts electricity. This can be explained as follows: Rain water, 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.
So, due to the presence of carbonic acid which provides ions to rain water , the rain water conducts electricity. Question 21 Why do acids not show acidic behaviour in the absence of water?
Solution: The acidic behaviour of acid is due to the presence of hydrogen ions. The acids will not show its acidic behaviour in the absence of water, this is because the acids produce hydrogen ions only in the presence of water. Which solution is? Arrange the pH in increasing order of hydrogen-ion concentration.
Question 23 Equal lengths of magnesium ribbons are taken in test tubes A and B. In which test-tube will fizzing occur more vigorously and why? Fizzing occurs in the test tube due to the evolution of hydrogen gas by the action of acid on magnesium ribbon. Since hydrochloric acid is a strong acid a large amount of hydrogen gas is liberated in the test tube A.
So fizzing occurs more vigorously in test tube A. Question 24 Fresh milk has a pH of 6. Solution: The pH will change to below 6, as lactic acid is formed when milk turns into curd. Question 25 Plaster of Paris should be stored in a moisture-proof container. Solution: The presence of moisture can affect the slow setting of plaster of Paris by bringing about its hydration. This will make the plaster of Paris useless after some time. Question 26 What is a neutralization reaction? Solution: The reaction of an acid and a base, giving rise to the corresponding salt and water is called neutralization reaction.
Question 27 Give two important uses of washing soda and baking soda. Solution: Washing soda 1. It is often used as an electrolyte. Domestically it is used as a water softener during laundry. Baking soda 1. It is used to test garden soil for acidity. If it develops bubbles, the soil is too acidic. Washing a car with it can remove dead bug bodies without damaging the paint. Question 1. Equal pieces of zinc granules are dropped in four test tubes.
Following substances are poured in all the four test tubes. Question 2. Which of the following statements shows the property of an acid? Thus, it has no effect on red litmus and acids are sour in taste. Question 3. A drop of a liquid sample was put on the pH paper. It was observed that the colour of the pH paper turned blue.
The liquid sample is [CCE ] a lemon juice b sodium bicarbonate solution c distilled water d hydrochloric acid Answer: b The liquid sample is of sodium bicarbonate NaHC 3 solution.
It is a basic solution. And we know that a basic solution turns pH paper blue. Question 4. Two solutions X and Y were found to have pH value of 4 and 10 respectively. Question 5. A student was asked to collect apparatus from lab store, for doing experiment of pH of given sample.
Identify the article which he is not supposed to pick. Question 6. Which one of the following would you need to identify the gas that evolve when you heat NaOH solution with zinc metal?
The gas will burn with a pop sound confirming the presence of hydrogen gas. Question 7. A solution has pH value of 5. On adding 10 mL of NaCl to it, what will be the pH of the new solution? Thus, it will not affect the pH of the solution. Hence, the pH of the solution will remain unaffected.
Question 8. A salt is dissolved in water. The pH of this salt solution was found to be 7 by measuring the pH with a universal indicator paper. Question 9.
A student performed an experiment using zinc granules and sodium carbonate with sodium hydroxide and hydrochloric acid under different conditions as shown below. In which set up, no gas is evolved? Question Four set ups as given below are arranged to identify the gas evolved when dilute hydrochloric acid was added to zinc granules.
Which is the most appropriate set up? HCl Solution A and dil. NaOH Solutions. The following observations were reported by the 4 students. The sign ����. NaOH solution B is a base which turns red litmus blue. A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish orange. Which of the following would change the colour of this pH paper to greenish blue? So, an antacid would change the colour of this pH paper to greenish blue.
Other options a and b contain acids and option c is a neutral salt. Salt is formed by combination of acid and base through neutralization reaction. CuSO 4. Let us see the different types of polynomials.
Constant Polynomial: It is a polynomial of degree zero. Linear Polynomial: It is a polynomial of degrees. Note: A linear polynomial may be a monomial having only one term. Quadratic Polynomial: It is a polynomial of degree 2. Cubic Polynomial: A polynomial of degree 3 is called a cubic polynomial.
This graph is a smooth free hand curve, passing through the points x 1 , y 1 , x 2 , y 2 , x 3 ,y 3 , ��, etc. Geometrical meaning of the zeroes of a linear polynomial. We make a table with values of y corresponding to different values of x. Image to be added soon.
The points A 0, 1 and B 2, 6 are plotted on the graph paper on a suitable scale. A line drawn runs through these points to derive the graph of the given polynomial.
We construct a table containing the values of y corresponding to various values of x:.
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