The above reaction is neutralization reaction. Answer: (i) Tap water conducts electricity whereas distilled water does not. Solved the very best collection of Acids, Bases and Salts Class 10 Science Important Questions and Answers Chapter 2 Pdf from the latest NCERT edition books, It will help you in scoring more marks in CBSE Exams. Question 36. Name the gas evolved when dilute HCl reacts with sodium hydrogen carbonate. Answer: NaHCO3 + … Get Instant Solutions, 24x7. What change would be observed in lime water? 1.Name the acid present in the following: (i) Tomato (ii) Vinegar (iii) Tamarind Answer. On cooling add few drops of water to anhydrous copper sulphate (white powder obtained) it turns blue. (a) What is the colour of copper sulphate crystals (CBSE 2013) Answer: Answer: Question 7. Baking powder is used to increase the volume and lighten the texture of baked goods. This reaction produces carbon dioxide gas and lets products “rise,” but it does so without the “yeast” taste that can result from using active yeast cultures as a source of the carbon … (Foreign 2009) (c) State the change in colour of pH paper on dipping in solution C and D.      (CBSE 2012) He learns that baking powder contains tartaric acid and sodium hydrogen carbonate. Potassium bicarbonate 1. Question 3. (iii) Crushed egg shells. in it. Name its main ingredients. (e) ‘A’ (H2SO4) will have lower pH. (iv) Tamarind. It is used in hospitals for a plaster cast. Save my name, email, and website in this browser for the next time I comment. Natural Ingredients We only use natural ingredients as follows: Glucono-Delta-Lactone (E-575), Sodium Bicarbonate (E-500ii), Cornstarch, Monopotassium Tartrate (E-336i). (ii) Why cake or bread swells on adding baking powder? Write the chemical equation. (d) Write chemical equations for both reactions. Question 14. It shows gas liberated is hydrogen. How does the flow of acid rainwater into a river make the survival of aquatic life in the river difficult? effervescence due to CO2. (i) Name the products obtained when sodium hydrogen carbonate is heated. Answer. Answer: (CBSE 2009) (Foreign 2008) Answer: Answer: Usui F, Carstensen JT. \(2 \mathrm{NaCl}+2 \mathrm{H}_{2} \mathrm{O} \stackrel{\text { electrolysis }}{\longrightarrow} 2 \mathrm{NaOH}+\mathrm{H}_{2}+\mathrm{Cl}_{2}\). Two solutions A and B have pH values of 5 and 8 respectively. (CBSE 2009) Question 29. (ii) lower H+ concentration respectively. One acid that may be in baking powder is 2,3-dihydroxybutanedioic acid. If we add some water in the white powder it regains the lost water molecules and become blue again. Answer: Answer: (iv) Adding water to acid is highly exothermic. Write chemical equation. When a burning splinter is brought close to the gas evolved, pop sound is produced and the gas continues to burn. (ii) Zn(s) + 2HCl(dil.) NaOH soln, blood, lemon juice. With the help of balanced chemical equations for all the changes explain the observations. Answer: Write its chemical name and formula. (i) before heating and Question 9. Baking soda – NaHCO3 (Sodium bicarb3onate) Answer: Answer: (i) X is sodium hydroxide, NaOH. (iii) Tamarind   (CBSE 2015) Which one of these two is an ingredient of antacids? The base and acid are prevented from reacting prematurely by the inclusion of a buffer such as cornstarch. (CBSE 2012) (iii) Crushed egg shell are made up of CaCO3 which reacts with dil HCl to give brisk Question 24. → CaCl2 + H2O + CO2 (i) Oxalic acid (ii) Acetic acid (iii) Tartaric acid 2.15 mL of water and 10 mL of sulphuric acid are to be mixed in a beaker (i) State the method that should be followed with reason. (ii)What is this process called? Explain the function of each ingredient. Write balanced chemical equation. Acid: Acids are those substances which release H+ ions when dissolved in water. (a) (i) Colour of copper sulphate crystals before heating is blue. (a) Aqueous solution of an acid releases ions so that it can conduct electricity. (a) Crystals of a substance changed their colour on heating in a closed test tube but regained it after sometime when they were allowed to cool down. Question 32. (ii) What is this process called? Question 16. It is used for increasing the volume and lightening the texture of baked goods. This has the molecular formula C 4H 6O 6 and it is often referred to as tartaric acid. Answer: Question 1. Answered By . Ca(OH)2 + CO2 → CaCO3. Answer: How would you show that blue copper sulphate crystals contain water of crystallisation? (c) What happens when electricity is passed through brine? In purely chemical terms, baking soda consists of only one ingredient, namely sodium bicarbonate (whose IUPAC name is sodium hydrogen carbonate). (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. (ii)The process is called dilution. (sodium carbonate decahydrate) Fresh milk has a pH of 6. (b) What is the source of liquid droplets seen on inner side of tube? C4H6O6 (aq) + 2NaHCO3â­¢ Na2C4H4O6 (aq) + … Join now. (i) Dry pellets of a base ‘X’ when kept in open absorbs moisture and turns sticky. Sodium hydrogen carbonate is also known as sodium bicarbonate and baking soda. Question 13. The reaction is highly exothermic, therefore, constant cooling should be done. Upvote(9) How satisfied are you with the answer? The carbon dioxide produced gives the fluffy texture. Give two uses of the compound. When fresh milk turns into curd, its pH value will decrease. Answer: (ii) Write the chemical equation for the reaction involved in the above. Sodium hydrogen carbonate reacts with the weak acid, releasing the carbon dioxide that makes batter and dough rise. Na2CO3 + 10H2O → Na2CO3.10H2O. Lv 7. What is meant by ‘water of crystallisation’ of a substance? Sodium bicarbonate is a mixture of carbon, sodium, hydrogen and oxygen. The overall chemical reaction between baking soda (sodium bicarbonate) and vinegar (weak acetic acid) is one mole of solid sodium bicarbonate reacts with one mole of liquid acetic acid to produce one mole each of carbon dioxide gas, liquid water, sodium ions, and acetate ions. Answer: (b) Write chemical equation to represent the action of atmospheric CO2 gas on bleaching powder when left exposed in open. Give equations of related reactions. Answer: Therefore, water is added to acid very slowly with cooling. When baking soda is heated a base is formed . How does the pH of the solution change when a solution of the base is diluted? What is the colour of litmus in a solution of ammonium hydroxide? Question 30. (CBSE 2006) Question 17. Bleaching powder – CaOCl2 A student detected the pH of four unknown solution A, B, C and D as follows 11, 5, 7 and 2. One molecule contains one carbon atom, one sodium atom, one hydrogen atom and three oxygen atoms for a molecular formula of NaHCO 3 or CHNaO 3.Based on molecular weights, sodium bicarbonate is composed of 57.1 percent sodium, 27.4 percent oxygen, 14.3 percent carbon and 1.2 percent hydrogen. Acid reacts with Ca3(PO4)2 and cause tooth decay. (ii) The soil is acidic in nature. Vegetable soup was found to be splashed both reactions ) dilute solution of ammonical.! Inner side of tube nature and their pH decreases ionises in aqueous solution and these ions conduct electricity range! Is yellowish-white powder and is used in kitchen for making crispy pakoras d ) Write the chemical taking... During summer season, a reaction occurs the increasing order of H+ ions solution! ) Write chemical equation for the mineral “ halite ” hydronium ions ( H3O+ ) decreases ) solution...: if the concentration of H+ ( aq ) in a dry boiling tube H2CO3 ) will it value... 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Gas liberated in both the tubes on February 3, 2017 at.... Of Zinc cakes to make it neutral by adding quicklime which neutralise acid...