Chapter 5 Acids, Bases and Salts
- What will bethesame of magnesium chloride?
- Classify aqueous solutions of the following substances according to their pH into three groups : 7, more than 7, less Substances pH Value Common salt equal to 7 Sodium acetate greater than 7 Hydrochloric acid less than 7 Carbon dioxide less than 7 Potassium... 1
- state the difference Negative electrode and positive electrode. Negative Electrode Positive Electrode Refers to a piece of electrochemical cell that is the negative pole Refers to a piece of electrochemic... 1
- State the differences. Cation and anion Cations Anions Positively charged particles Negatively charged particles Formed by loss of electrons from metals Formed by gain of electrons... 1
- State the differences. 1. Acids and bases Acid Base Substance which when dissolved in water gives hydrogen ion Substance which when dissolved in water can accept hydrogen ions Substa... 1
- Buttermilk spoils if kept in a copper or brass container. Buttermilk spoils if kept in a copper or brass container because Brass or copper reacts with organic acid. Buttermilk contains lactic acid a... 1
- Hydronium ions are always in the form H3 O+ The strength of an acid is measured in terms of the extent of the dissociation of acid in an aqueous solution. The higher H⁺ ion concentrati... 1
- Explain what is meant by electrolysis of water. Write the electrode reactions and explain them Electrolysis of water : When electric current is passed through water containing a few drops of an acid or a few drops of a base, it dissoci... 1
- What is meant by neutralization? Give two examples from everyday life of the neutralization reaction. Neutralization reaction : A neutralization reaction is a reaction in which an acid and a base reacts to form water and a salt. It involves t... 2
- Classify the acids according to their basicity and give one example of each type. The number of ionizable hydrogen (H⁺) ions obtainable by dissociation of one molecule of an acid is called its basicity For example : HCl --... 2
- Obtain a sample of rainwater. Add to it a few drops of universal indicator. Measure its pH. This is an activity based question in which you are supposed to collect rainwater from different places. If we take samples of rain water fr... 1
- Write down the concentration of each of the following solutions in g/L and mol/L. 4) 4.9 g H2SO4 in 200 mL solution Given: Volume of solution = 200ml =0.2L, Mass of CH₃COOH in gram =4.9g Molecular Formula = H₂SO₄ Molecular mass of H₂SO₄ = 2(H)+1(S)+4(O) =... 1
- Write down the concentration of each of the following solutions in g/L and mol/L. 3) 3g CH3COOH in 100 mL solution Given: Volume of solution = 100ml =0.1L, Mass of CH₃COOH in gram =3g Molecular Formula = CH₃COOH Molecular mass of CH₃COOH = 2(C)+2(O)+4(H)... 1
- Write down the concentration of each of the following solutions in g/L and mol/L. 2) 2g NaOH in 50 mL solution Given: Volume of solution = 50ml =0.05L, Mass of NaOH in gram =2g Molecular Formula = NaOH Molecular mass of NaOH = 23 +16 + 1 = 40m Mass of... 1
- Write down the concentration of each of the following solutions in g/L and mol/L. 1) 7.3g HCl in 100ml solution Given: Volume of solution = 100ml =0.1L, Mass of Solute in gram =7.3g Molecular Formula = HCL Molecular mass of HCl = 1+35.5=36.5 m Mass of... 1
- Show the dissociation of the following compounds on dissolving in water, with the help of chemical equation and (i) HCl underrightarrowwater H^(+ )+ Cl⁻ Dissociation is large (ii) NaCl underrightarrowwater Na⁺ + Cl⁻ Dissociation is large (iii) KOH unde... 2
- Formation of a magnesium chloride from magnesium and chlorine. Atomic number of Magnesium atom is 12. Electronic configuration is : Mg = 2, 8, 2 So it contains 2 valence electron. In order to achieve the... 1
- Formation of sodium chloride from sodium and chlorine. Atomic number of Sodium (Na) atom is 11. Electronic configuration is: Na = 2, 8, 1 So it contains 1 valence electron. In order to achieve th... 1
- Classify the following oxides into three types and name the types. CaO, MgO, CO2 , SO3 , Na2O, ZnO, Al2O3 , Fe2O3 1) Acidic Oxides: CO₂ (Carbon dioxide), SO₃ (Sulfur trioxide) 2) Basic Oxides: CaO (Calcium oxide), MgO (Magnesium oxide), Na₂O (Sodium oxid... 1
- Dilute H2SO4 was taken in an electrolytic cell and electric current was passed through it. When a dilute solution of sulfuric acid is electrolysed, gases are produced at both the anode and the cathode electrode. The gas produced at... 1
- Pieces of blue vitriol were heated in a test tube. On cooling, water was added to it. When pieces of blue vitriol are heated in a test tube, then crystal structure of blue vitriol broke down to form a colourless powder and wat... 1
- Dilute HCl was added to limestone. Limestone is calcium carbonate. When Dilute HCl was added to limestone, it forms calcium chloride, water and carbon dioxide gas. 2HCl + CaCO... 1
- Zinc oxide was added to dilute HCl and zinc oxide was added to dilute NaOH. When Zinc oxide is added to dilute HCl, it forms zinc chloride and water and neutralization reaction takes place. In this reaction zinc oxid... 1
- Magnesium oxide was added to dilute HCl and magnesium oxide was a added to dilute NaOH. Bases react only with oxides of non-metal to form salt and water and neutralization reaction take place. Magnesium oxide is a base. When Mag... 2