(b) Name the compound whose one formula unit is associated with 10 water molecules. Baking soda: The primary use of sodium bicarbonate where it is used as baking soda. Why? (iii) to make bread and cake soft and spongy. (a) Alkali, e.g., NaOH (Sodium hydroxide). The pH range suitable for aquatic survival is 7.0 to 7.8 and due to acid rainwater pH of river water decreases. Answer: In purely chemical terms, baking soda consists of only one ingredient, namely sodium bicarbonate (whose IUPAC name is sodium hydrogen carbonate). When fresh milk turns into curd, its pH value will decrease. Question 36. Bases soluble in water are called alkali. \(2 \mathrm{NaCl}+2 \mathrm{H}_{2} \mathrm{O} \stackrel{\text { electrolysis }}{\longrightarrow} 2 \mathrm{NaOH}+\mathrm{H}_{2}+\mathrm{Cl}_{2}\). How is this soup likely to … Acid reacts with Ca3(PO4)2 and cause tooth decay. It works by releasing carbon dioxide gas into a batter or dough through an acid-base reaction, causing … (i) HCl is completely ionised in aqueous solution whereas acetic acid is partially ionised in aqueous solution. If excess of CO2 gas is passed through lime water, milkiness will disappear due to the formation of Ca(HCO3)2(aq) which is soluble in water. (i) State the method that should be followed with reason. Effervescence of CO2 gas is seen. (CBSE 2008/2012) (a) (i) Colour of copper sulphate crystals before heating is blue. In Baking. (c) State for what purpose is bleaching powder used in water treatment plants. I: Interactions of sodium bicarbonate and tartaric acid under compressed conditions. FeSO4.7H2O Ferrous sulphate [Green vitriol]. (ii) It is because acid ionises in aqueous solution and these ions conduct electricity. 2NaHCO3 → Na2CO3 + CO2 + H2O (c) Hydrogen gas will be formed. Washing soda → Na2CO3 + 10H2O. Answer. This is because lactic acid is produced when milk changes into curd. (CBSE 2012) NaOH + HCl → NaCl + H2O Question 9. Write the chemical equation for the reaction involved. (a) Write the name given to bases that are highly soluble in water. This will help us to improve better. Water of crystallization is fixed number of water molecules present in the crystalline state of salt. Which gas is generally liberated when a dilute solution of hydrochloric acid reacts with an active metal? State reason for the following statements: (a) Identify the compound of calcium which is yellowish-white powder and is used for disinfecting drinking water. One of the constituents of baking powder is sodium hydrogen carbonate, the other constituent is: A. acetic acid. johnmulu answered the question on February 3, 2017 at 12:08. An active metal reacts with hydrochloric acid to give hydrogen gas. Fresh milk has a pH of 6. Name an industrial use of washing soda other than washing clothes. 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(b) Arrange the above four solutions in the increasing order of H+ ion concentration. (AI 2008) Question 4. Why does tooth decay start when the pH of mouth is lower than 5.5? (CBSE 2012) Answer: 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 … (a) HCl is acid and NaOH is base whose combination forms the common salt. Ashish. (b) C(10-12) < B (10-9) < D(10-7) < A(10-6) (b) Lower the pH, more will be tooth decay. (i) as an antacid Join now. (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. Nick is researching why baking powder is a common baking ingredient. Explain the function of each ingredient. The gas evolved is CO2. \(\frac{1}{2}\)H2O. Thus, it is a basic salt. Answer: For what purpose is it used in paper factories? CaCO3(s) + H2O(l) + CO2(g) → Ca(HCO3)2(aq). 0 0. bravozulu. Question 8. 4 years ago. (ii) A farmer treats the soil with quicklime or calcium carbonate. Zn(s) + 2HCl(dil) → ZnCl2(aq) + H2(g). How can it be prevented? Answer: Ca(OH)2(aq) + CO2(g) → CaCO2(s) + H2O(l) Acid containing recipes often say add a little of extra bicarbonate. Answer: This is chlor-alkali process. B. oxalic acid. (CBSE 2015) Answer: (a) Write chemical name and formula of the powder (a) Identify the most acidic and most basic solutions. Mg + H2CO3 → MgCO3 + H2 It may be white or light blue or yellow depending upon impurities present (CBSE 2006) (i) It is used for bleaching purposes in laundary, textile and paper industries. (iii) Tamarind   (CBSE 2015) Name the gas evolved when dilute HCl reacts with sodium hydrogen carbonate. It is prepared by passing CO2 gas through saturated solution of ammonical brine. It shows gas liberated is hydrogen. (CBSE 2012) 0 0. Question 8. (b) (i) NaHCO3 is antacid. (iii) Baking soda does not allow milk to change to lactic acid which makes milk sour. It consists of sodium hydrogen carbonate and tartaric acid. Two solutions A and B have pH values of 5 and 8 respectively. (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. (b) When this white powder is mixed with water a hard solid mass is obtained. (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. (b) Rock salt is the common name for the mineral “halite”. (ii) Why cake or bread swells on adding baking powder? Take a dry boiling test tube, add few crystals of blue copper sulphate and heat it on the flame. If you don't, you affect the taste. (c) Which has higher pH value, a concentrated or dilute solution of hydrochloric acid? The key difference between sodium carbonate and sodium bicarbonate is that the sodium carbonate contains sodium, carbon and oxygen atoms whereas the sodium bicarbonate contains sodium, carbon, oxygen atoms along with a hydrogen atom. What is its chemical formula? (Foreign 2008) (CBSE 2012) NaOH soln, blood, lemon juice. Ca(OH)2 + Cl2 → CaOCl2 + H2O The compound is calcium sulphate hemihydrate, Plaster of Paris CaSO4. For Sex, I love you so much Zaid❤️❤️❤️❤️mele jaan.......mera sb kuch...pyaaluu☺️​, Not for bad purposeI'd-934 723 6482pass-1234join me.....M J​, only for girls come here id 5324611502 and password is modiji​ on zoom​. 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. (i) When sodium hydrogen carbonate is heated. Answer: The reaction proceeds in two steps. How is it manufactured? (a) What is the colour of copper sulphate crystals Answer. What happens chemically when quick lime is added to water? Answer: (a) Those substances whose smell (odour) changes in acidic or basic solution are called olfactory indicators, e.g., onion and vanilla. (i) Tomato Baking soda is used as an antacid it neutralises excess acid in the stomach and provides relief. (iii) Crushed egg shells. (Foreign 2008) (Foreign 2008) Which solution will be basic in nature? answered. (ii) Write the name and chemical formula of the product formed. Baking powder is a mixture of baking soda and tartaric acid . Answer: Answer: B will be basic nature, with pH = 8. (CBSE 2012) How is it recognised? (i) before heating and CaCO3 + H2SO4 (dil.) Join now. (a) Identify the acid and the base whose combination forms the common salt that you use in your food. (i) Citric acid. Question 10. Answer: State and explain the function of tartaric acid in baking powder . (v) Ammonia is a base but does not contain hydroxyl group. e.g. Therefore, water is added to acid very slowly with cooling. The reaction that occurs between sodium bicarbonate (NaHCO 3) and cream of tartar (KHC 4 H 4 O 6) is: NaHCO 3 + KHC 4 H 4 O 6 → KNaC 4 H 4 O 6 + H 2 O + CO 2. Question 4. Baking powder contains an acid to react with the carbonate that's also in the mixture and release carbon dioxide. CH3COOH, NH4OH, KOH, HCl C4H6O6 (aq) + 2NaHCO3â­¢ Na2C4H4O6 (aq) + … C. carbonic acid. It causes bubbles to form that make the cake rise. Answer: What would be the colour of litmus in a solution of sodium carbonate? Question 10. (ii) Sodium hydroxide Bleaching powder – CaOCl2 Bleaching powder – CaOCl2 (ii) Dry hydrogen chloride gas does not turn blue litmus red whereas dilute hydrochloric acid does. Thank You (ii) While diluting an acid, why is it recommended that the acid should be added to water and not water to the acid? (CBSE 2013) (c) Dilute solution of HCl will have higher pH than concentrated solution. One acid that may be in baking powder is 2,3-dihydroxybutanedioic acid. Acid: Acids are those substances which release H+ ions when dissolved in water. (i) A large amount of heat is evolved → Exothermic reaction The reaction takes place vigorously with hissing noise and bubbles. (d) What do you observe on adding dilute hydrochloric acid to Answer: (ii)The process is called dilution. Happens chemically when quick lime is added to water the reason due to acid produced... For some time tube condenses with water blue colour disappears and turns.... Is treated with dilute hydrochloric acid to react with the Answer that use! Water become less basic in nature to pH g ) Odourless and colourless gas hydrogen is evolved with bubbles surface... Burning splinter is brought close to the gas evolved when dilute HCl gives Red! + 2HCl ( dil. as tartaric acid under compressed conditions 10H2O → Na2CO3.10H2O is. 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Metal reacts with the help of balanced chemical equation of Chlor-alkali process Question 6 exposed in open absorbs and. Water contains ions which conduct electricity, distilled water does not contain hydroxyl.!