Equal length of magnesium ribbon are taken in two test tubes A’ and ‘B’, H2SO4 is added to test tube ‘A’ and H2CO3 in the test tube ‘B’ in equal amounts:       (CBSE 2013) 1.Clean the burette with distilled water, then empty the water, then rinse the burette with potassium permanganate solution, and then empty the burette. (c) State for what purpose is bleaching powder used in water treatment plants. This reaction helps to study the. (iv) Adding water to acid is highly exothermic. The electrode, connected to the positive terminal of a battery, is called (a) anode (b) pole (c) cathode (d) photodiode Answer: (a) Question 4. Answer: It is converted into washing soda by heating followed by crystallization. Question 25. 697 Pages. Write the complete. It will burn with ‘pop’ sound. all the reactions represented above occur in aqueous solution of oxalic acid. Answer: Answer: On diluting permanganate crystals decompose to release oxygen. Answer: 54. Question 14. Read the list of chemical substances below and highlight the substances that would conduct electricity, and in what situation(s). Phosphoric Acid . (AI 2009) What change would be observed in lime water? Give equations of related reactions. (CBSE 2012) Give an example, (i) Dry pellets of a base ‘X’ when kept in open absorbs moisture and turns sticky. Sodium hydrogen carbonate on heating gives C02 which makes cake soft and fluffy. (CBSE 2013) (ii) as a soda acid fire extinguisher (CBSE 2009) Question 7. To show the water of crystallisation in copper sulphate: (a) Identify the most acidic and most basic solutions. (CBSE 2008) It can be prevented by brushing teeth after every meal. (i) X is sodium hydroxide, NaOH. Answer: Here, potassium permanganate is the oxidizing agent and oxalic acid is the reducing agent. NaOH + HCl → NaCl + H2O Answer: (AI 2009) the precipitate conduct electricity? One of the most important industrial applications of KMnO4 is as an oxidizing agent in the chemical synthesis of many important compounds. (b) The strong acid is HCl and strong base is KOH. A compound which is prepared from gypsum has the property of hardening when mixed with a proper quantity of water. The equations representing oxidation in these media are as follows: 2KMnO4 +5Na2SO3+ 3H2SO4 → K2SO4 + 2MnSO4 + 5Na2SO4+3H2O, 2 KMnO4 + 16 HCL → 2 MnCL2 + 2 KCL + 8 H2O + 5 Cl2, (Concentrated hydrochloric acid makes chlorine). What effect does an increase in concentration of H+(aq) in a solution have on the pH of solution? (c) Dilute solution of HCl will have higher pH than concentrated solution. (i) Tap water contains ions which conduct electricity, distilled water does not contain ions. Answer: Answer: When fresh milk turns into curd, its pH value will decrease. This proves that crystals contain water molecules in it. The colour of copper sulphate changes to white. The compound is also formed by chlor-alkali process. -Soluble in acetone, methanol, acetic acid, trifluoroacetic acid, acetic anhydride, pyridine, benzonitrile, sulfolane. Name the acid present in tomato. Write balanced chemical equation for the change. On cooling add few drops of water to anhydrous copper sulphate (white powder obtained) it turns blue. It reacts violently with sulfuric acid resulting in an explosion. An acid–base reaction is; sometimes called a proton-transfer reaction. (ii) Dry hydrogen chloride gas does not turn blue litmus red whereas dilute hydrochloric acid does. During cooking → It decomposes to sodium carbonate, carbon dioxide and water. Bases soluble in water are called alkali. In neutral solution, permanganate is reduced to brown manganese(IV) oxide, where Mn is in a +4 oxidation state. (fa) Give reason to support your answer. Answer: Answer: Answer: (iii) Sour milk (curd) This is what we will discuss in this article. If the temperature is too low (below 55 degrees Celsius), the interaction between the oxalic acid and the potassium permanganate will move too slow. Name an industrial use of washing soda other than washing clothes. Question 30. (i) Name the products obtained when sodium hydrogen carbonate is heated. In general, the extent to which an electrolyte can break up into ions categorises an electrolyte. (iii) Tamarind   (CBSE 2015) (ii) Oxalic acid. (ii) Write the name and chemical formula of the product formed. (b) How does the concentration of hydronium ions (H3O+) change when a solution of an acid is diluted? (iii) Baking soda does not allow milk to change to lactic acid which makes milk sour. Question 3. (a) A metal compound ‘X’ reacts with dil. Answer: (i) When sodium hydrogen carbonate is heated. Question 10. (d) Mg + H2SO4 → MgSO4 + H2 Answer: Write the chemical formula for washing soda. Answer: How? The amount of his electricity bill was (a) ` 125 (b) ` 225 (c) ` 325 (d) ` 425 Successive discounts of 10%, 20% and 30% is equivalent to a single discount of (a) 60% (b) 49.6% (c) 40.5% (d) 36% The price of an article was first increased by 10% and then again by 20%. Question 3. Answer: Oxalic acid. (CBSE 2015) Answer: (i) Tap water contains ions which conduct electricity, distilled water does not contain ions. (c) State the change in colour of pH paper on dipping in solution C and D.      (CBSE 2012) (iii) Crushed egg shells. oxalic acid, HOOCCOOH(aq), is found in rhubarb leaves. What is an alkali? Manganese(IV) oxide is the stuff that stains skin when KMnO4 is put on it. We apologize for the inconvenience, but you may be able to find it instead through your library resources. 7.Repeat the previous steps three times; then calculate the average volume of potassium permanganate used in titration; then calculate the concentration of potassium permanganate. Heat it (CBSE 2013) Also it may cause systemic toxic effects such as adult respiratory distress syndrome, coagulopathy, hepatic-renal failure, pancreatitis, and even death in severe cases. Potassium permanganate is commercially prepared by mixing solution of potassium hydroxide KOH and powdered manganese oxide MnO2, with oxidizing agents like potassium chlorate. forms dangerous products when mixed with concentrated acids. (ii) Why cake or bread swells on adding baking powder? So the color disappears. (c) Distilled water does not conduct electricity because it does not contain any ionic compounds dissolved in it whereas rain water does. Sodium hydrogen carbonate is a salt of sodium hydroxide (strong base) and carbonic acid (weak acid). (a) HCl is acid and NaOH is base whose combination forms the common salt. Write the chemical formula of bleaching powder, how is bleaching powder prepared? Its chemical name is calcium oxychloride. A student dropped few pieces of marble in dilute hydrochloric acid, contained in a test-tube. Question 7. (iii) During summer season, a milk man usually adds a very small amount of baking soda to fresh milk. (iv) For a dilution of acid, acid is added into water and not water into acid. It is used as a regeneration chemical to remove iron and hydrogen sulfide (rotten egg smell) from well water. Preparation: On passing chlorine gas over slaked lime (Ca(OH)2), bleaching powder is obtained. Answer: (iii) You have four solutions A, B, C and D. The pH of solution A is 6, B is 9, C is 12 and D is 7. A. KMnO4 solution is purple in color due to presence of MnO 4- ions. (i) Lemon and orange (a) ‘X’ is CaCO3 (calcium carbonate). (ii) It is because acid ionises in aqueous solution and these ions conduct electricity. (b)Why does an aqueous solution of an acid conduct electricity? permanganate crystals decompose to release oxygen. The acid released reacts with enamel, which is made up of calcium phosphate and tooth decay starts. (a) Give Arrhenius definition of an acid and a base. It neutralizes excess of acid formed in the stomach. (a) Aqueous solution of an acid releases ions so that it can conduct electricity. How can it be verified? Question 32. Answer: (i) before heating and (i) Tomato Molecular weight of potassium permanganate = 158, From the above experiment, it is evident that potassium permanganate can be effectively standardized by using oxalic acid solution. KMnO4 spontaneously reduces in a basic solution to green-colored potassium manganate, where manganese is in the +6 oxidation state. Answer: It is used in hospitals for a plaster cast. Mg + H2CO3 → MgCO3 + H2 Write the chemical Write the chemical reaction taking place when the powder is heated during baking. How is this compound manufactured? Question 21. Answer: (ii) Sodium chloride and water will be formed (ii) Tomatoes and Guava. It regains its colour by absorbing water from atmosphere and becomes blue in colour. (v) Ammonia is a base but does not contain hydroxyl group. (iii) to make bread and cake soft and spongy. This function: Red litmus will change to blue colour in solution of sodium carbonate. Question 2. C) on the basis of your classification, predict the result of a conductivity test for a solution containing oxalic acid. Write its formula and chemical name of this salt. Baking soda – NaHCO3 (Sodium bicarb3onate) Baking powder is a mixture of baking soda and tartaric acid. In presence of dil. Identify ‘X’. It is produced (in the chemical industry) from manganese dioxide. Baking soda on heating gives sodium carbonate which on crystallisation forms washing soda (b) Name the compound whose one formula unit is associated with 10 water molecules. A metal is released in the electrolysis of a salt. Conductivity is the material’s ability to conduct electricity. Write its chemical name and formula. (b) \(2 \mathrm{NaHCO}_{3} \stackrel{\text { heat }}{\longrightarrow} \mathrm{Na}_{2} \mathrm{CO}_{3}+\mathrm{CO}_{2}+\mathrm{H}_{2} \mathrm{O}\) (ii) It is used for the manufacture of glass. Answer: (a) The compound is bleaching powder (CaOCl2). (CBSE 2006) The oxalate ion, C2O42-, will react quantitatively with permanganate ion, MnO4-, in the presence of strong acid according to the following equation: MnO4- (aq) + C2O42- (aq) ( Mn2+ (aq) + CO2 (g) The numerical value of Keq for the equilibrium is very large. (CBSE 2015) The color of potassium permanganate changes with the reaction; no further indicator is used in this experiment to determine the endpoint as the potassium permanganate is a self-indicator. Ca(OH)2 + Cl2 → CaOCl2 + H2O effervescence due to CO2. (b) What is rock salt? Question 4. It can react with many reducing agents or organic material because it is inflammable. (e) Out of the two acids taken above (b) It is because H2SO4 is strong acid. Adsorption is widely applied in both potable and municipal or industrial wastewater treatments process. Question 17. (c) Why does bee sting cause pain and irritation? Birla Institute of Technology and Sciences (BITS), Pilani conducts BITS Admission Test (BITSAT) for admission into various courses. How will you explain this statement on the basis of ionisation and how is it affected by concentration of sodium chloride? Answer: Answer: (b) How is washing soda is obtained from baking soda? (b) Na2CO3.10H2O. HCl being a strong acid ionise completely to give more H+ ion than CH3COOH (a weak acid which ionise partially) of equal concentration. (Foreign 2008) (e.g. Question 22. (b) What is the source of liquid droplets seen on inner side of tube? (ii) After heating blue colour disappears and turns white. How does it make the cake soft and spongy? How will you prove its liberation? (iii) It liberates CO2 on heating which makes bread and cake soft and spongy. (c) It is due to formic acid. equation for it. (CBSE 2015) (AI 2008) The above reaction is neutralization reaction. Identify M and black coloured product and also explain the reaction of M with oxygen. (i) Sodium carbonate placed in test tube. Question 10. Crystals of copper sulphate are heated in a test tube for some time. The toxicity of oxalic acid (OA) to Varroa has been known for nearly three decades based on experiments conducted in Asia and later in Europe. What is the colour of litmus in a solution of ammonium hydroxide? It is used in printing fabrics and tanning leathers. a 1 (the number of electrons gained per formula unit of potassium permanganate in the balanced chemical equation of half-cell reaction) =2. Answer: Answer: In this experiment, potassium permanganate is the analyte and oxalic acid is the titrant . (i) Oxalic acid Acid when dissolved in water the H+ concentration in moles per litre decreases and therefore pH will increase, as the solution becomes less acidic on dilution. (c) Brine is the aqueous solution of NaCl which undergoes electrolysis on passing current and forms H2 and Cl2 gases with NaOH as aqueous solution. Question 11. (c) Name the gas liberated in both the tubes. Write the chemical equation for the reaction involved. Above 70 degrees Celsius, oxalate acid begins to decompose, so it’s important to stay in this range. Since it acts by destructive oxidation process on all organic matter, its use is restricted for external purposes only. (CBSE 2008) 1. In fuel cell technology, it’s used as an electron receiver in a microbial fuel cell. Tags: Rubbing of baking soda on the sting area gives relief. formed is removed continuously in order to prevent its breaking down. pH of the strong base would be 14, on diluting its pH becomes below 14). (ii) Zinc metal in a test tube? (a) Why does an aqueous solution of an acid conduct electricity? Question 16. 30 seconds . The MnO2 formed is removed continuously in order to prevent its breaking down. (c) What happens when electricity is passed through brine? MCQ Questions for Class 10 Science with Answers was Prepared Based on Latest Exam Pattern. Question 29. [CBSE 2009] Answer: Oxalic acid has many uses, but it is widely used as a wood bleach because it removes stains without removing the natural color of the wood. What is meant by water of crystallisation in a substance? CH3COOH, NH4OH, KOH, HCl It is also used for curing acidity in the stomach. Repeat the previous steps three times; then calculate the average volume of potassium permanganate used in titration; then calculate the concentration of potassium permanganate. → CaCl2 + H2O + CO2 But that cancelled registration does not mean that "anything goes" - when used to control varroa, oxalic acid still meets the legal definition of a pesticide under FIFRA, and its legal use to control varroa needs EPA registration (or some kind of other formal published action - … (ii) Dry HCl does not form ions but dilute HCl gives H+ and Cl– ions in solution. On heating permanganate crystals decompose to release oxygen. (b) Write the balanced chemical equation of Chlor-alkali process. CH3COOH, H2SO4, H2CO3, HNO3       (CBSE 2015) How is it manufactured? Write the chemical equation for its preparation. the precipitate settles to the bottom, does the solution above. (ii) lower H+ concentration respectively. It is manufactured by reaction of solid slaked lime with dry chlorine gas. Recall the types of chemical substances that can conduct electricity. Why does 1M HCl solution have a higher concentration of H+ ions than 1M CH3COOH solution? Explain. 3.Transfer 10 ml of oxalic acid by means of a pipette into clean conical flask; then add 5 ml of dilute sulfuric acid; then heat the solution to 70oC using hot plate in order to fasten the reaction between oxalic acid and potassium permanganate. Thus, it is a basic salt. Name its main ingredients. It is also known as permanganate of potash and Condy’s crystals. Question 9. (c) pH paper will become blue in ‘C’ and green in ‘D’. Another important application of KMnO4 is in the treatment of bacterial infections. Question 12. (CBSE 2006) 15 ml of water and 10 ml of sulphuric acid are to be mixed in a beaker Explain the function of each ingredient. Oxalic acid is a weak acid. Question 22. Acidic and basic solutions in water conduct electricity. Answer: The farmer wants to make it neutral by adding quicklime which neutralise the acid in the soil. What is an acid and what is a base? On organic and analytical chemistry, because of its strong color and oxidizing nature, KMnO4  is used in chemistry laboratories as a reagent to calculate the amount of substance that can be oxidized in a sample. Based on this degree the electrolytes can be classified as strong or weak electrolyte and non-electrolyte. Zn(s) + 2HCl(dil) → ZnCl2(aq) + H2(g). ‘B’ (H2CO3) will have lower concentration of H+. Chemical formula → NaHCO3 (ii) The soil is acidic in nature. (i) Hydrogen gas will be formed A solution of 1:5000 of permanganate, when used as a gastric wash, oxidizes poison and prevents their absorption. Answer: How does it provide relief in stomach ache? Water vapour collects on the inner sides of the test tube. Name the acid present in the following: Question 15. (a) Identify the compound of calcium which is yellowish-white powder and is used for disinfecting drinking water. Question 36. (b) Choose a strong acid and strong base from the following: -) ion has a dark purple color. 5.Continue adding potassium permanganate until the solution changes from colorless to purple color again and take the end point. It can be used on spots on furniture, like dark water marks, and it can be used to remove stains from larger areas of wood like floors and decks. The pH range suitable for aquatic survival is 7.0 to 7.8 and due to acid rainwater pH of river water decreases. Answer : Because of less reactivity, copper metal does not release hydrogen gas with acid. Answer: (CBSE 2009) Question and Answer forum for K12 Students. Acid reacts with Ca3(PO4)2 and cause tooth decay. (b) Write chemical equation to represent the action of atmospheric CO2 gas on bleaching powder when left exposed in open. Question 15. Answer: However, if the compound is unable to ionise it does not conduct electricity it is called a non-electrolyte. Oxalic acid is a strong electrolyte that dissociates completely in water. This reaction helps to study the oxidation and reduction theory. Ca(OH)2 + Cl2 → CaOCl2 + H2O It does not . The molecular weight/molar mass of KMnO4 is 158.034 g/mol.

White Foam While Boiling Dal, Is Cfh3 Polar Or Nonpolar, X4 Map Faulty Logic, Sleigh Bedroom Sets Cherry Wood, Villeroy And Boch Bathrooms, Easton Xx75 Gamegetter 340,