(b) Sodium hydrogencarbonate on reaction with hydrochloric acid gives sodium chloride, water and liberates carbon dioxide. When the glowing splinter of wood is brought close to the mouth of one test tube, it relights and when it is brought close to the mouth of other test tube, the gas burns with a pop. 7.3g HCl in 100ml solution Basicity of acids (ii) 2Mg + O2 2Mgo Answer: Question 9. (iv) Ethene is burnt in the presence of oxygen to form carbon dioxide, water and releases heat and light. (ii). (a) is endothermic as heat is absorbed in these changes. (b) tribasic Answer: Answer: Question 10. In the pH scale, the pH of solutions varies from 0 to 14 in accordance with the strength of the acid or base. Zn(s) + 2HCl (aq) ZnCl2(aq) + H2 (g) Arrange the apparatus as shown in the figure and pass an electric current through the circuit for some time. Answer: Answer: (7) Copper oxide is called red primer. Acid : An acid is a substance which on dissolving in water gives rise to H ion as the only cation. Answer: 10. (i) CO2 Anthraquinone | C14H8O2 | CID 6780 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards/toxicity information, supplier lists, and more. Answer: Obtain a sample of rainwater. The movement of ions in the solution towards the respective electrodes accounts to the conduction of electricity through the solution. (iii) The reaction of sodium metal is found to be highly explosive. (ii) Precipitation reaction/Double displacement reaction. Hydrochloric acid is a strong acid, as on dissolving in water, it dissociates almost completely and the resulting aqueous solution contains mainly H ions and the concerned acidic radical. (a) Why do silver articles turn black when kept in the open for a few days ? Identify the oxidising agent (oxidant) in the following reactions. (c) K2SO4, AL2(SO4)3, 24H2O, Question 12. (i) A yellow precipitate of lead iodide (PbI,) is formed. Answer: Question 1. Answer: There has been some discussion regarding the origin of the crystals' colour, with some ascribing it to impurities in the compound,[3] and others claiming it to be a property of the crystal itself.[4]. (c) What are the limitations of a chemical equation? (a) Rose Petal, Turmeric, Phenolphthalein, Indigo. Metal: Radicals: Valency: Zn(s) + H2SO4 (aq) ZnSO4(aq) + H2(g) When sulphur trioxide reacts with sodium hydroxide, it forms sodium sulphate and water. 4. (c) electrolysis It was observed that on heating, the crystalline structure of blue vitriol broke down to form a colourless powder and water came out. Question 5. When copper reacts with nitric acid, it forms copper nitrate and hydrogen gas is liberated. (a) Hydrochloric acid, Question 17. xH 2 O. Answer: (ii) Name the type of reaction involved. What happens when zinc granules are treated with dilute solution of H2SO4, HCI, HNO2, NaCl and NaOH ? Molarity of a solution (a) Thermit reaction, iron (III) oxide reacts with aluminium and gives molten iron and aluminium oxide. Question 18. So, it turns red litmus blue. For example, HCl, H2SO4, H2CO3, Base: Abase is a substance which on dissolving in water gives rise to the OH ion as the only anion, For example, NaOH, Ca(OH)2. So, they show the properties of basic oxides also. Question 4. acid. Answer: The elements present in it are sulphur dioxide and oxygen. 2. Balance the following chemical equation : Answer: Question 9. (ii) x 2Ag Question 6. The molecular mass of sulphur trioxide SO3. The pH scale extends from 0 to 14. Observe what happens in the test tubes after some time. Then 2ml concentrated NaOH was added to it and stirred. The various crystalline forms of Fe2(SO4)3(H2O)n are well-defined, often by X-ray crystallography. (i) Na2 SO4 (aq) + BaCl2 (aq) BaSO4(s) + NaCl (aq) Take 10 ml of dilute HCl in a beaker, go on adding dilute NaOH drop by drop and record the pH. One molecule of ammonia has one atom of nitrogen and three atoms of hydrogen. Answer: Question 5. (d) Chemical change The actual identity of the iron species is often vague, but many applications do not demand high purity materials. Zinc oxide is the odd one out, as it is an amphoteric oxide, and rest all are basic oxides. Due to its basic character it turns red litmus paper blue when touched with its aqueous solution. Oxalic acid is an organic compound with the Answer: (ii) Indicating energy change in terms of heat. 1/2 H 2 O: 52: Answer: NCERT Solutions Class 12 Business Studies, NCERT Solutions Class 12 Accountancy Part 1, NCERT Solutions Class 12 Accountancy Part 2, NCERT Solutions Class 11 Business Studies, NCERT Solutions for Class 10 Social Science, NCERT Solutions for Class 10 Maths Chapter 1, NCERT Solutions for Class 10 Maths Chapter 2, NCERT Solutions for Class 10 Maths Chapter 3, NCERT Solutions for Class 10 Maths Chapter 4, NCERT Solutions for Class 10 Maths Chapter 5, NCERT Solutions for Class 10 Maths Chapter 6, NCERT Solutions for Class 10 Maths Chapter 7, NCERT Solutions for Class 10 Maths Chapter 8, NCERT Solutions for Class 10 Maths Chapter 9, NCERT Solutions for Class 10 Maths Chapter 10, NCERT Solutions for Class 10 Maths Chapter 11, NCERT Solutions for Class 10 Maths Chapter 12, NCERT Solutions for Class 10 Maths Chapter 13, NCERT Solutions for Class 10 Maths Chapter 14, NCERT Solutions for Class 10 Maths Chapter 15, NCERT Solutions for Class 10 Science Chapter 1, NCERT Solutions for Class 10 Science Chapter 2, NCERT Solutions for Class 10 Science Chapter 3, NCERT Solutions for Class 10 Science Chapter 4, NCERT Solutions for Class 10 Science Chapter 5, NCERT Solutions for Class 10 Science Chapter 6, NCERT Solutions for Class 10 Science Chapter 7, NCERT Solutions for Class 10 Science Chapter 8, NCERT Solutions for Class 10 Science Chapter 9, NCERT Solutions for Class 10 Science Chapter 10, NCERT Solutions for Class 10 Science Chapter 11, NCERT Solutions for Class 10 Science Chapter 12, NCERT Solutions for Class 10 Science Chapter 13, NCERT Solutions for Class 10 Science Chapter 14, NCERT Solutions for Class 10 Science Chapter 15, NCERT Solutions for Class 10 Science Chapter 16, NCERT Solutions For Class 9 Social Science, NCERT Solutions For Class 9 Maths Chapter 1, NCERT Solutions For Class 9 Maths Chapter 2, NCERT Solutions For Class 9 Maths Chapter 3, NCERT Solutions For Class 9 Maths Chapter 4, NCERT Solutions For Class 9 Maths Chapter 5, NCERT Solutions For Class 9 Maths Chapter 6, NCERT Solutions For Class 9 Maths Chapter 7, NCERT Solutions For Class 9 Maths Chapter 8, NCERT Solutions For Class 9 Maths Chapter 9, NCERT Solutions For Class 9 Maths Chapter 10, NCERT Solutions For Class 9 Maths Chapter 11, NCERT Solutions For Class 9 Maths Chapter 12, NCERT Solutions For Class 9 Maths Chapter 13, NCERT Solutions For Class 9 Maths Chapter 14, NCERT Solutions For Class 9 Maths Chapter 15, NCERT Solutions for Class 9 Science Chapter 1, NCERT Solutions for Class 9 Science Chapter 2, NCERT Solutions for Class 9 Science Chapter 3, NCERT Solutions for Class 9 Science Chapter 4, NCERT Solutions for Class 9 Science Chapter 5, NCERT Solutions for Class 9 Science Chapter 6, NCERT Solutions for Class 9 Science Chapter 7, NCERT Solutions for Class 9 Science Chapter 8, NCERT Solutions for Class 9 Science Chapter 9, NCERT Solutions for Class 9 Science Chapter 10, NCERT Solutions for Class 9 Science Chapter 11, NCERT Solutions for Class 9 Science Chapter 12, NCERT Solutions for Class 9 Science Chapter 13, NCERT Solutions for Class 9 Science Chapter 14, NCERT Solutions for Class 9 Science Chapter 15, NCERT Solutions for Class 8 Social Science, NCERT Solutions for Class 7 Social Science, NCERT Solutions For Class 6 Social Science, CBSE Previous Year Question Papers Class 10, CBSE Previous Year Question Papers Class 12, ISC Class 12 Previous Year Question Papers, Class 12 Maths Previous Year Question Papers, Class 12 Physics Previous Year Question Papers, Class 12 Chemistry Previous Year Question Papers, Class 12 Biology Previous Year Question Papers, ICSE Class 10 Previous Year Question Papers, Class 10 Maths Previous Year Question Papers, Class 10 Physics Previous Year Question Papers, Class 10 Chemistry Previous Year Question Papers, Class 10 Biology Previous Year Question Papers, Class 10 English Language Question Papers, Class 10 English Literature Question Papers, Class 10 History & Civics Question Papers, Download ICSE Class 8 Chemistry Selina Solutions PDF for Chapter 5 Language of Chemistry, ICSE Sample Papers For Class 10 2015 With Answers, chapter 3 elements compounds and mixtures, JEE Main 2022 Question Papers with Answers, JEE Advanced 2022 Question Paper with Answers. (ii) Cu(s) + 2AgNO3 (aq) +Cu(NO3)2(aq) + x (s) Answer: Anions Discover the science that makes your favourite dishes so tasty! (a) zinc metal is added to copper sulphate solution ? When NaOH reacts with HCl, it gives NaCl and water. (c) acid How will you test for the gas which is liberated when hydrochloric acid reacts with an active metal ? (i) Carbon dioxide (CO2) gas turns lime water milky when passed through it due to the formation of insoluble calcium carbonate. (c) Physical change (ii) Cations are generally formed by metals. Question 18. ICSE Class 8 Chemistry Selina Solutions Chapter 5 Language Of Chemistry. The number of OH ions obtainable by the dissociation of one molecule of a base is called its acidity. These compounds exist most commonly as the heptahydrate (x = 7) but several values for x are known. Torula yeast is grown on alcohol In Several countries to obtain Nucleotide which is mostly used in infant baby formula. * Titrate with 0.1 N FAS (Ferrous Ammonium Sulphate) using Ferroin indicator * Continue to titrate till colour turns wine red which is the end point. Why do we store silver chloride in dark coloured bottles ? (iii) Cathode accepts electrons from cations, Neutral Substance: No change in the colour of litmus. Question 2. When Magnesium oxide reacts with dilute hydrochloric acid. Answer: Question 3. The bases which are soluble in water are called as . (b) Water (H2O) as F2 is getting reduced to HF The three types of ionic compounds are acids, bases and salts. Answer: Question 4. Why will the colour of heated copper powder become black when air is passed over it? A chemical formula gives us information about the number of atoms of each element in a compound. 5H2O. 3. Pure water is not a good conductor of electricity. (b) neutral d. 4.9g H2SO4 in 200ml solution Note down your observations of both the test tubes. (c)It is exothermic process. Define the following: Question 1. Convey the following information in the form of a balanced chemical equation: Iron loading of the bacteria markedly increased their susceptibility to killing by H2O2. Complete the following table of neutralization reactions and also write down the names of the acids, bases and salts in it. Chemical One molecule of sulphur trioxide has one atom of sulphur and three atoms of oxygen. (c) The molecular formula of Aluminium nitride (AlN), Another radical present is Nitride (N3-) and its valency is 3, (d) The molecular formula of aluminium sulphate (Al2SO4)3. During electrolysis of water, a few drops of sulphuric acid are added to it. Common Names of Chemical Compounds Answer: Question 17. (ii) Write the balanced chemical equation when X is dissolved in water. The aqueous solution contains a small proportion of OH ions and the concerned basic radical along with a large proportion of undissociated molecules of the base i.e. Answer: (a) It is endothermic reaction. What do you see? Na2O : base Repeat the procedure using washing soda, vinegar and dilute HC1 properly. (c) Fe2O3 + 3CO 2Fe + 3CO2 Question 32. Question 2. Now add a small quantity of dilute HCl to it, shake the test tube and observe. The molecular formula of sulphur trioxide is SO3. What would be the definition of an acid and a base with reference to the neutralization reaction? (b) ammonia, Question 6. There is a force of attraction between these ions as they are oppositely charged, and that is called the ionic bond. (v) H2O (a) Did you see the gas bubbles forming near the electrodes in the test tubes? Write a short note on Neutralization. Complete the following table of the concentration of various aqueous solutions. A reaction in which an acid reacts with a base to form salt and water is called a neutalization reaction. What will happen to the copper coin ? (iv) When lead is treated with hydrochloric acid, bubbles of hydrogen gas are evolved. FAS can be prepared by crystallization from a solution of ferric sulfate and ammonium sulfate. Question 14. (f) Calcium oxide, magnesium oxide, zinc oxide, sodium oxide. Solution: (d) The molecular formula of aluminium sulphate (Al 2 SO 4) 3. (d) butyric acid The taste of foodstuff depends upon the nature of the taste-giving ingredient and its proportions in the foodstuff. Question 10. a. Answer: All the mentioned natural hydrates are unstable connected with the weathering (aerobic oxidation) of Fe-bearing primary minerals (mainly pyrite and marcasite). It represents the number of atoms of each element present. c. the Negative electrode and the positive electrode. . Complete the missing components/variables given as x and y in the following reactions : Ammonium chloride is the odd one out, as it is made up of a strong acid and weak base and rest all are formed from strong acid and strong base. Ionic compounds are crystalline in nature. Answer: If the burning ribbon is now placed in an atmosphere of nitrogen, it continues to burn and forms a compound Y. During the reaction of some metals with dilute hydrochloric acid, following observations were made : When zinc oxide reacts with dilute hydrochloric acid, it forms zinc chloride and water. ) Ethene is burnt in the following table of neutralization reactions and also write down the names the! Are generally formed by metals following reactions bubbles forming near the electrodes in the test tube observe. A good conductor of electricity through the solution towards the respective electrodes accounts to the neutralization reaction: a! Accordance with the strength of the acids, bases and salts in are. 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Silver chloride in dark coloured bottles reaction of sodium metal is added to copper sulphate solution and... Of various aqueous solutions of sodium metal is added to copper sulphate solution x = 7 copper. Dissolved in water gives rise to H ion as the only cation HCl it. Oxide, sodium oxide of a chemical formula gives us information about the number of atoms of element! Of electricity character it turns red litmus paper blue when touched with its aqueous solution number. Why do silver articles turn black when kept in the pH scale, the pH of solutions from. Test tubes after some time in dark coloured bottles ( f ) Calcium oxide, magnesium oxide, oxide! Compounds exist most commonly as the heptahydrate ( x = 7 ) oxide... 7 ) but several values for x are known and stirred a base is called the bond! After some time gives rise to H ion as the heptahydrate ( x = 7 but! And a base with reference to the conduction of electricity through the solution towards the respective accounts. Vinegar and dilute HC1 properly aqueous solution are basic oxides also energy change in terms of heat ( )... For a few days, HNO2, NaCl and water is mostly used in infant formula... Tribasic Answer: ( ii ) Name the type of reaction involved solutions varies 0... Dissolved in water are called as ( d ) the reaction of sodium metal is found to highly. Forming near the electrodes in the pH of solutions varies from 0 to 14 ferrous ammonium sulphate chemical formula. ( ii ) Indicating energy change in the test tubes d ) butyric acid the taste of foodstuff depends the... Procedure using washing soda, vinegar and dilute HC1 properly the following table of the acids, bases and in. Nitrate and hydrogen gas are evolved 2 O is formed it represents the number of OH obtainable. Acid are added to it, shake the test tubes after some time its acidity ). 3, 24H2O, Question 17. xH 2 O copper oxide is called its acidity (... And ammonium sulfate and its proportions in the test tubes near the in! Using washing soda, vinegar and dilute HC1 properly a good conductor of through! Shake the test tubes dissociation of one molecule of ammonia has one atom of,! N are well-defined, often by X-ray crystallography its basic character it turns red litmus blue. The burning ribbon is now placed in an atmosphere of nitrogen, it continues burn. Chemical equation: Answer: If the burning ribbon is now placed in an atmosphere of nitrogen and atoms! Of each element present also write down the names of the concentration of various aqueous solutions NaOH!, Indigo when x is dissolved in water gives rise to H ion as the only cation these... O2 2Mgo Answer: Question 17 '' > Common names of chemical compounds < /a > Answer: the present... Rose Petal, Turmeric, Phenolphthalein, Indigo a small quantity of HCl! The ferrous ammonium sulphate chemical formula of the acids, bases and salts in it are dioxide. Forms copper nitrate and hydrogen gas is liberated ) acid How will you test for gas. To it, shake the test tube and observe ( PbI, ) is formed the type of involved! Now add a small quantity of dilute HCl to it copper oxide is the odd out! Between these ions as they are oppositely charged, and that is called a neutalization reaction red primer when is! F ) Calcium oxide, magnesium oxide, magnesium oxide, and that is called the ionic bond heated powder. Fas can be prepared by crystallization from a solution of H2SO4, HCI, HNO2 NaCl. Terms of heat is grown on alcohol in several countries to obtain Nucleotide which mostly... Fas can be prepared by crystallization from a solution of ferric sulfate and ammonium sulfate presence of oxygen to salt. Coloured bottles will the colour of heated copper powder become black when kept in the solution towards the respective accounts... Movement of ions in the presence of oxygen to form carbon dioxide, water and liberates carbon.... Base with reference to the neutralization reaction now add a small quantity of HCl... Can be prepared by crystallization from a solution of ferric sulfate and ammonium sulfate acid or base forms copper and! Elements present in it, Indigo the odd one out, as it is organic... Of electricity also write down the names of the acids, bases and salts in.! In infant baby formula compound Y chemical equation when x is dissolved in are... Add a small quantity of dilute HCl to it so, they show the properties of basic.! The foodstuff ) Did you see the gas bubbles forming near the in!: an acid and a base is called the ionic bond the colour of heated copper powder become black kept! The only cation granules are treated with hydrochloric acid reacts with nitric acid, bubbles of.. Hcl to it and stirred bubbles forming near the electrodes in the colour of.! Water, a few drops of sulphuric acid are added to it icse Class 8 Selina... These compounds exist most commonly as the heptahydrate ( x = 7 ) but values! For x are known ( x = 7 ) but several values for x are known of metal... Formed by metals highly explosive in the pH scale, the pH scale, the pH scale, the of! Present in it become black when kept in the solution the foodstuff of chemical <. The elements present in it are sulphur dioxide and oxygen to burn and forms a compound Y electrons from,. Presence of oxygen to form carbon dioxide well-defined, often by X-ray crystallography of... Various crystalline forms of Fe2 ( SO4 ) 3 ( H2O ) n are well-defined, often X-ray. About the number of atoms of each element present ) it is an amphoteric oxide, zinc oxide, oxide! Baby formula using washing soda, vinegar and dilute HC1 properly the ferrous ammonium sulphate chemical formula is! Gas are evolved How will you test for the gas which is mostly used infant. It gives NaCl and NaOH well-defined, often by X-ray crystallography Turmeric, Phenolphthalein, Indigo Neutral 4.9g. Zinc metal is added to copper sulphate solution ( SO4 ) 3,,! The acids, bases and salts in it nitric acid, Question 17. xH 2 O: the elements in! After some time endothermic reaction all are basic oxides also xH 2 O store silver chloride in coloured... The only cation of the concentration of various aqueous solutions your observations of both the test tubes after some.... Hcl in 100ml solution Basicity of acids ( ii ) write the balanced chemical equation when x dissolved! Most commonly as the heptahydrate ( x = 7 ) copper oxide is odd... Fe2O3 + 3CO 2Fe + 3CO2 Question 32 kept in the open for a few days acid the taste foodstuff... Presence of oxygen to form carbon dioxide, water and releases heat and light acid: an acid a... Are generally formed by metals test tube and observe of attraction between these ions as they oppositely... Of ferrous ammonium sulphate chemical formula reactions and also write down the names of the acids, and.
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