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Chemistry Grade 10 Unit 2: Solutions

national exam questions have come from this unit. It runs 57 pages; one careful study pass takes about 7.9 hours, and its difficulty is harder among Chemistry units. Each section below lists the questions set from it, with the year, and opens the page that teaches it.

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2.1 Heterogeneous and Homogeneous Mixtures · read p. 53

2013 E.C., Q23 – The difference between colloids and suspension is that
2012 E.C., Q3 – Which of the following substances might stabilize a colloidal suspension of oil in water?
2012 E.C., Q21 – Lava is a foam colloid. The dispersed phase and dispersion medium are respectively:
2009 E.C., Q47 – Which of the following types of solution are possible? 1. Solid dissolved in a liquid 2. Gas dissolved in a gas 3. Gas dissolved in a liquid 4. Solid dissolved in a solid

2.2 The Solution Process · read p. 59

2018 E.C., Q36 – A student crushes a large crystal of sugar into many small pieces before dissolving it in water. The sugar dissolves faster than the large crystal. Which of the following correctly describes the observation?
2015 E.C., Q75 – The speed with which a solute goes into solution is
2015 E.C., Q1 – Which one of the following is a colorless, flammable volatile liquid and miscible with non-polar solvents?
2014 E.C., Q56 – What is the rate of dissolution? It is
2013 E.C., Q54 – The "like dissolves like" rule accounts for one of the following observation
2012 E.C., Q49 – When the compounds below are listed in order of decreasing boiling point (highest to lowest) which one is the correct order? 1. Ethane 2. Fluoroethane 3. Ethanol 4. Ethanoic acid
2012 E.C., Q2 – In which of the following solvents would you expect the solubility of NaCl to be greatest?
2012 E.C., Q69 – Which of the following is the most important type of solute-solvent interaction in solution NaCl(s) in water?
2011 E.C., Q51 – In which of the following cases will the dissolution of sugar be the most rapid?
2010 E.C., Q9 – A ___ corresponds to an ___ process.
2010 E.C., Q61 – Which of the following is true regarding the solution formation process?
2010 E.C., Q36 – The phrase "like dissolves like" refers to the fact that:
2007 E.C., Q12 – What type of solute-solvent interaction should be the most important in a solution of iodine in carbon tetrachloride?
2007 E.C., Q4 – The process of solute particles being surrounded by solvent particles is known as
2007 E.C., Q57 – The dissolution of water in octane ( ) is prevented by
2006 E.C., Q5 – Which of the following statement(s) is (are) true of an ideal liquid-liquid solution? I. It obeys PV = nRT II. It obeys Raoult's law III. Solute-solute, solvent-solvent, and solute-solvent interactions are very similar.
2006 E.C., Q41 – If the solute-solvent interactions are greater than the solute-solute and solvent-solvent interactions, what will be the total vapour pressure of the solution?
2005 E.C., Q31 – Which of the following is the most important type of solute-solvent interaction in a solution of n- butanol in water?

2.3 Solubility as an Equilibrium Process · read p. 73

2015 E.C., Q21 – The partial pressure of acetylene, $\mathrm{C_2H_2}$, in a container is 10 atm at $25^\circ\text{C}$. What is the solubility in molarity of $\mathrm{C_2H_2}$, assume that $\mathrm{C_2H_2}$ obeys Henry's law? ($K_H = 1.04
2014 E.C., Q57 – Which one of the following is correctly stated regarding solubility as an equilibrium process?
2013 E.C., Q25 – 50 mL of the supernatant saturated solution of NaCl was taken in an evaporating dish (weight=w₀) and evaporated over a Bunsen burner until all the water has evaporated and dry sodium chloride is left in the evaporating d
2012 E.C., Q10 – The solubility of a particular salt in water is 9.9 g/mL at room temperature. If 11.1 g is completely dissolved in one milliliter of water, the solution is
2011 E.C., Q38 – When a saturated solution of sodium chloride is heated, it becomes
2010 E.C., Q38 – You are given a bottle of solid x and three aqueous solutions of Y, the first saturated the second unsaturated and the third supersaturated. Which of the following is correct, if you add a small amount of the solid solut
2009 E.C., Q45 – The solubility of NaCl in water at C is 36g in 100g of water. A solution that contains 18g of NaCl in 50g of 200 water at C is
2007 E.C., Q54 – The solubility of oxygen gas in water at and 1.0 atm pressure of oxygen is 0.41g/L. the solubility of oxygen in water at 25 C 0 3.0 atm and is g/L.

2.4 Ways of Expressing Concentration of Solution · read p. 81

2018 E.C., Q37 – A technician prepares a solution by dissolving 40 g of NaOH in enough water to make 500 mL of solution. What is the molarity (M) of this solution?
2016 E.C., Q22 – A 250 mL solution is formed from 24.5 g of sulfuric acid (H 2 SO 4 ). What is the normality of this solution? (Mol. wt. H 2 SO 4 = 98 g/mol)
2015 E.C., Q22 – What is the normality of a solution that contains 19.6 g of $\mathrm{H_2SO_4}$ in 20 mL of the solution?
2015 E.C., Q13 – How does the equivalent mass of a base is obtained?
2014 E.C., Q10 – How many moles of C 12 H 22 O 11 (sucrose Molecular weight= 342.91 g/mol) is needed there to prepare 2.0 L of 0.3 M solution?
2014 E.C., Q9 – What is the concentration of a solution? It is
2013 E.C., Q55 – The concentrated sulphuric acid H 2 SO 4 we use in the laboratory is 98% H 2 SO 4 by mass and has a density of 1.83 g/mL. Below are given the concentrations of the acid in various units, which of the given alternatives c
2013 E.C., Q29 – One of the following given mass of acids constitutes the corresponding equivalent of the acid
2013 E.C., Q62 – Which of the following concentration units is correctly defined?
2011 E.C., Q76 – What is the freezing point of a solution of 250 g of $\mathrm{CaCl_2}$ in 1.0 kg of water? ($K_f$ for $\mathrm{H_2O}$ = 1.86 kg/mol)
2011 E.C., Q68 – Given the following unbalanced equation How many grams of are needed to make 250 mL of 0.20 N solution?
2010 E.C., Q67 – How long has a current of 3 ampere to be applied through a solution of silver nitrate to coat a metal surface of 80cm2 10.5gcm−3 with 0.005cm thick layer? Density of silver =
2010 E.C., Q44 – Commercial concentrated sulphuric acid (density = $1.831\,\text{g cm}^{-3}$) is 94.0% $\mathrm{H_2SO_4}$ by mass. What is the normality of $\mathrm{H_2}$)
2010 E.C., Q45 – 2.3g of ethanol ( ) is added to 500g of water. What is the molality of the resulting solution?
2009 E.C., Q42 – How many grams of methanol would have to be added to water to prepare $150\text{ml}$ of solution which is $2.0\mathrm{M}$ methanol?
2009 E.C., Q43 – A certain 500g toothpaste sample has 0.2g of fluoride. What is the concentration of the fluoride in ppm?
2008 E.C., Q18 – What is the molality of a solution that contains 51.2gm of naphthalene, $\mathrm{C_{10}H_8}$ in 500ml of carbon tetrachloride? The density of $\mathrm{CCl_4}$ is 1.60gm/ml
2008 E.C., Q13 – What is the solvent in 70% alcohol solution?
2008 E.C., Q14 – How many moles of $\mathrm{H_2SO_4}$ are needed to prepare 5.0 liters of a 2.0M solution of $\mathrm{H_2SO_4}$?
2007 E.C., Q32 – What is the molality of a 5g hydrogen peroxide ( ) in 100mL solution that is used for hair bleaching?
2007 E.C., Q42 – What is the final concentration of ion when 250ml of 0.20M solution is mixed with 250ml of 0.4M KCl solution? (Assume additive volumes)
2006 E.C., Q16 – A beaker filled to the 100mL mark with salt (the salt has a mass of 100g) and another beaker to the 100mL mark with water (the water has a mass of 100g) are mixed together in a bigger beaker until the salt is completely
2006 E.C., Q51 – An aqueous solution is 70% nitric acid ( ) by mass. What is the concentration of expressed in molality?
2006 E.C., Q69 – A lab instructor is preparing 5.0 liters of a $0.10\mathrm{M}$ $\mathrm{Pb(NO_3)_2}$ (molecular mass 331) solution. What is the mass required?
2006 E.C., Q37 – How many moles of sodium hydroxide are present in 2.5L of 0.5M aqueous solution?
2006 E.C., Q43 – What volume of 0.500M NaOH is required to neutralize 25.0 mL of 1.2 ? (Assume complete ionization of the acid).
2005 E.C., Q65 – A solution was prepared by dissolving 3.75 g of pure hydrocarbon in 95.0g of cyclohexane. The boiling point of 80.70 C 0 81.45 C 0 pure cyclohexane was observed to be and that of the solution was . What is the approximat
2005 E.C., Q64 – A solution was prepared by adding 48g of methanol ( ) in to 81g of water ( ). What is the mole fraction of methanol in this solution?

2.5 Preparation of Solutions · read p. 94

2015 E.C., Q76 – Which one of the following explains how 2 L of 1 M NaOH aqueous stock solution is converted into a 0.25 M NaOH solution?
2012 E.C., Q25 – A chemist adds water to 120 mL of a 6 M solution of HCl until the final volume is 2 L. What is the molarity of the resulting solution?
2012 E.C., Q1 – According to World Health Organization (WHO), the standard for the concentration of alcohol used to prevent COVID-19 virus is 70%. How much water has to be added to prepare the standard alcohol for 1L of 96% alcohol?
2011 E.C., Q28 – How much water, in liters, must be added to 0.50 liter of 6.0 M HCl to make the solution 2.0 M?
2010 E.C., Q46 – A 0.5L and 0.1 solution is to be prepared by dilution process form a 13M nitric acid. How many ml conc. and how many ml of water are required to prepare the dilute solution?
2005 E.C., Q34 – What is the quantity of water, in mL, required to prepare $0.5\,\mathrm{M}$ of $\mathrm{HCl}$ from a concentrated solution of $3.5\mathrm{M}$ in 50 mL is?
2005 E.C., Q38 – Which of the following statements is TRUE about colligative properties?

2.6 Solution Stoichiometry · read p. 98

2010 E.C., Q62 – What volume of 1.40M solution is needed to react exactly with 10.0g of aluminium according of the following reaction?

2.7 Describing Reactions in Solution · read p. 101

2009 E.C., Q40 – When the molecular equation: Is written in terms of ionic equation, which one of the following pairs will be the spectator ions? Na+ Cl− Ca2+ Cl−
2008 E.C., Q15 – What is the balanced net ionic equation for the reaction of and ? CaCl (aq) + 2AgNO (aq) →2(NO )2 (aq) + 2AgCl (s) 2 3 3 Ca (aq) + 2Cl (aq) + 2NO (aq) →Ca (aq) + 2NO + 2+ − 3 − 2+ 3 −