Question. C Non aqueous

Transcription

1 (hem 108 hapter 7 ) Ques. no. 1 Which is not an example of a? Question 2 dental filling B hicken soup Gasoline Sea water n example of colloids is Milk B Hot coffee Vinegar Gasoline 3 with water, H 2O as the solvent is called. 4 Organic B queous Milk is an example of Non aqueous ll of these Solution B olloid Heterogeneo us mixture 5 Which one of the following compounds is water, H 2O soluble? 6 ll of these Steric acid, 18 H 36 O 11 B l 4 Glucose, Octane, 8 H 18 6 H 12 O 6 Which of the following pairs of compounds will form a? 6H 6 and Nal and 6 H 14 B 6 H 14 7 Which of the following compounds is soluble in H 2O? H 2 O and l 4 H 2 O and 6 H l 4 B 6 H 6 Nal H 4 The, in which maximum number of grams of solute dissolves, is called. Saturated B Unsaturated Which substance is a non-electrolyte? Supersaturated ll of these Kl in H 2 O B KOH in H 2 O H 2 O 2 in H 2 O Nal in H 2 O 1

2 Nonpolar compounds are soluble in. Ionic compounds B Electrolytes Polar solvents Nonpolar solvents Henry's law states that the solubility of a gas in a liquid is proportional to the Partial pressure of the gas above the liquid B Temperature the liquid of Temperature of the gas above the liquid The solubility of gases with increasing temperature? Increases B ecreases Remain the same Which of the following is an electrolytes? Molecular weight of the gas above the liquid ll of these H 2 O 2 in H 2 O B l 4 in H 2 O 12H 22 O 11 in H 2 O Nal in H 2O is made by dissolving 3.88 g of Nal in enough water to make 67.8 ml of. What is the concentration of (w/v)% Nal? 5.41% (w/v) Nal B 5.72% (w/v) Nal 94.3% (w/v) Nal %(w/v) Nal 750 ml bottle of wine contains 105 ml ethanol. What is the (v/v) % concentration of ethanol? 8.0%(v/v) Ethanol B 20%(v/v) Ethanol 25% (v/v) Ethanol 10%(v/v) Ethanol saline used in intravenous drips for patients contains 0.92% (w/v) Nal in water. How many grams of Nal are contained in 575 ml of this? 53 g Nal B 529 g Nal 5.3 g Nal g Nal particular wine contains 11.2% (v/v) ethanol. What volume of ethanol is in a 750 ml bottle of this wine? 84.0 ml ethanol B ml ethanol 6.70 ml ethanol 14.9 ml ethanol What is the concentration in parts per million (ppm) of T in 5.0 mg in 1 Kg, needlefish tissue? 0.5 ppm B 50 ppm 5.0 ppm 500 ppm 2

3 sample of seawater contains 1.3 g of calcium ions in 3,100 kg of. What is the calcium ion concentration of this in units of ppm? ppm 0.42 ppm a2+ a 2+ ions B ppm 420 ppm a2+ ions ions a 2+ ions What is the molarity of a made by dissolving 3.09 moles of Nal in 1.50 L of? 4.64 M Nal B 4.85 M Nal 2.06 M Nal M Nal What is the molarity of a made by dissolving 3.09 moles of Nal in 1.50 L of? 4.64 M Nal B 4.85 M Nal 2.06 M Nal M Nal What is the molarity of a made by dissolving 4.88 g of Kl in 423 ml of? M Kl B 11.5 M Kl M Kl M Kl 23 How many grams of glucose ( 6H 12 O 6 ) are contained in 555 ml of a 1.77 M glucose? g 6 H 12 O 6 B g 6 H 12 O g 6H 12 O g 6H 12 O 6 What is the concentration of a formed by diluting 25.0 ml of a 3.2 M Nal to ml? 17 M Nal B 0.59 M Nal 0.50 M Nal 2.7 M Nal alculate the molarity of a made from 20.0 g of NaOH in 250 ml of 2.0 M B 4.0 M 0.02 M 0.04 M What is the concentration of a formed by diluting 5.0 ml of a 3.2 M glucose to 40.0 ml? 0.04 M B 0.25 M 0.40 M 2.5 M 3

4 How many milliliters of a 6.0 M NaOH would be needed to prepare 750 ml of a 4.0 M 500 ml B 250 ml 400 ml 40 ml How many milliliters of a 4.0% (w/v) must be used to prepare 250 ml of a 0.080% (w/v)? 5.0 ml B 2.5 ml 0.50 ml 25 ml Which law is stated that, the solubility of a gas in a liquid is proportional to the partial pressure of the gas above the liquid? vogadro s law B Raoult s law Henry s law Boyel s law How many milliliters of a 5.25% (w/v) Hl must be used to prepare 250 ml of a 0.175% (w/v) Hl? 8.3 ml Hl B 240 ml Hl 8.6 ml Hl 230 ml Hl 31 The maximum level of lead (Pb+2 ) allowed in drinking water is 15 µg/kg. What is this concentration in units of parts per million? ppm Pb +2 B ppm ppm Pb +2 Pb +2 Which of the following is an electrolytes? 3.1 ppm Pb+2 H 2 O 2 in H 2 O B l 4 in H 2 O 12H 22 O 11 in H 2 O Nal in H 2O For most ionic and molecular solids, solubility generally... as temperature increases. Remains the same B Increases ecreases ll of these..is defined as the number of moles of solute per liter (L) of? Molality (m) B Molarity (M) Normality (N) Mole fraction 4

5 Which compound will be the most soluble in water? B Which compound will be the least soluble in water? B The attraction of an ion with a dipole in a molecule is called. dipole-dipole interaction B London n ion dipole dispersion forces interaction Two s with the same osmotic pressure are said to be Hypotonic s B Isotonic s Hypertonic s Swelling and rupture of red blood cells is called. Hemolysis B renation Osmosis hypotonic has a..than body fluids Van der Waals forces Isomeric Reverse Osmosis Lower osmotic pressure B Higher osmotic pressure negligible osmotic pressure ll of these 41 What happens if a red blood cell is placed in a hypertonic, resulted in The cell rupture the cell shrivels The cell keeps its ll of these (Homolysis) B (renation) normal volume 42 What happens if a red blood cell is placed in a hypotonic, resulted in The cell rupture the cell shrivels The cell keeps its (Homolysis) B (renation) normal volume 43 hypertonic has a..than body fluids ll of these Lower osmotic pressure B Higher osmotic pressure negligible osmotic pressure ll of these 5

6 M glucose is separated from a 0.2 M glucose by a semipermeable membrane. Which exerts the greater osmotic pressure? 0.1 M glucose B 0.2 M glucose 0.3 M glucose 0.4 M glucose 45 flask contains two compartments ( and B) with equal volumes of separated by a semi permeable membrane. Which diagram represents the final level of the liquids if is initially a 10% (w/v) glucose and B is initially a 20% (w/v) glucose? B ll of these 46 Osmosis is the passage of water and small molecules across a semipermeable membrane from.. a of low solute onc. to a of higher solute onc. B a of high solute onc. to a of lower solute onc. 47 ir is a..of gases, primarily N 2 and O 2? Both () and (B) ll of these Mixture B Solution olloid ll of these 48 that has less than the maximum number of grams of solute is said to be... Supersaturated B Saturated Unsaturated ll of these 49 Octane ( 8 H 18 ) dissolves in l 4 because both are nonpolar liquids that exhibit. 50 London dispersion forces B Hydrogen bonding Ion - dipole interactions What volume of a 5.0% (w/v) of ketamine contains 75 mg? 1.5 ml B 3.5 ml 5.4 ml ll of these 2.2 ml 6

7 (hem 108 hapter 8 ) Ques. no. 1 n rrhenius acid is Question 2 compound that contains hydroxide and dissolves in H 2 O to form OH Brønsted-Lowry acid is B compound that is a proton donor compound that is a proton acceptor compound that contains hydrogen and dissolves in H 2 O to form H compound that contains hydroxide and dissolves in H 2 O to form OH B compound that is a proton donor Which species can act as a Brønsted Lowry acid? 2 O 3 Which species can act as a Brønsted Lowry base? compound that is a proton acceptor B HBr Br 2 LiOH 2 O 3 Which of the following species cannot be a Brønsted - Lowry acid? B HBr H 2 O 3 NH 4 + HF B HSO 3 NH 3 HI Which of the following species cannot be a Brønsted - Lowry base? compound that contains hydrogen and dissolves in H 2 O to form H + l(oh) 3 B Br NH Which of the following is conjugate acid of the NH 3? NH 2 8 raw the conjugate base of the acid HO 3? B H 3 O + NH 4 + N Hl 2 O 3 9 raw the conjugate acid of the base NO 3? B H 2 O 3 H 3 O 3 H 2 O H 2 NO 3 B HNO 3 H 3 NO 3 HNO 2 7

8 10 Which of the following acid is secreted by stomach to digest food? H 2 SO 4 B H 3 PO 4 HNO 3 Hl 11 Which species is the conjugate base of NH 3? + NH 4 12 Which species is the conjugate acid of NH 3? 13 NH 2 Which species is a diprotic acid? B H 2 O NH 2 NH 3 B H 3 O + NH 4 + NH 3 14 Mg(OH) 2 B H 3 OOH H 2 H 2O 3 Which compound is an example of weak acid? HNO 3 B HBr H 3OOH H 2SO 4 15 mmonia, NH 3 is an example of a.? Strong acid B Strong base Weak acid Which ion is the strongest base? Br B F I NO 3 Rank the increasing strength of the acids HI, HBr and Hl? HI< HBr < Hl B Hl < HBr <HI HI< Hl < HBr Weak base HBr < Hl < HI 18 Increasing order of the acids is H 3 OOH < HF < H 3 PO 4. Rank theconjugate bases in inc order? H 3 OO < F < H 2 PO 4 B F < H 3 OO < H 2 PO 4 H 2PO 4 < F < H 3 OO H 2PO 4 < H 3 OO < F Which acid is the strongest? HSO 4 (K a = ) B HN (K a= ) HF (Ka = ) Which acid is the weakest? NH 4 + (K a = ) HSO 4 (K a = ) B HN (K a= ) HF (K a= ) NH 4 + (K a = ) 8

9 Ques. no. Question 21 What is the expression of K w, the ion product constant for water? K w = [H 2 O] 2 B K w = + [H3O ][ OH] + [H3O ][ OH] Kw = 2 [H O] 2 Kw = + [H3O ] [ OH] 22 The [H 3 O + ] in a wine is M. What is the [OH ] in this wine? Given (K w = M) M B M M M 23 The [ OH] in a sample of egg whites is M. What is the [H 3 O + ] in egg whites? M B M M M Which has the highest ph? M H 3 O + B M H 3 O M H 3 O M H 3 O + Which has the lowest ph? M H 3 O + B M H 3 O M H 3 O M H 3 O + 26 If the [H 3O + ] in a cup of coffee is M, alculate the [OH ]? M B M M M 27 If [H 3O + ] in blood sample is M, what is the value of [OH ]? M B M M M 28 In human blood, [OH ] > [H 3 O + ], it means that blood is? Neutral B cidic Basic 29 alculate the value of [H 3O + ] in M Hl? ll of these M B M M M 9

10 30 alculate the value of [H 3O + ] in M NaOH? M B M M M What is the formula of ph? ph= log[h 2 O] B ph = log[oh ] ph = log[h 3 O + ] ph= log[h 2 O 2 ] 32 Which of the following is Not True for a neutral? ph = 7 B [H 3 O + ]=10 7 [OH ]=10 7 [H 3 O + ]= What is the ph of a urine sample that has [H3 O + ] = M? ph= 5 B ph=7 ph= 8 ph= 9 34 What is the ph of wine that has an [H 3O + ] = M? 3.49 B What is the ph of a cleaning with a [H 3 O + ] = M? 5.9 B Which one of the following s has ph = 3? 3.0 M H 3 OOH B 0.001M NaOH 0.001M Hl 0.001M Nal 37 What is the ph of a urine sample that has [H 3O + ] = M, and classify as acid, basic or neutral? 38 ph = 5, basic B ph = 7, neutral ph = 5, acid ph = 5, acid sample of blood has a ph = 7.4, which of the following is NOT True for the blood sample? Basic B [OH ] > [H 3 O + ] [H 3 O + ] > 10-7 [OH ] >

11 39 What is the concentration [H 3O + ] in sweat that has a ph= 6? M B M M M Normal gastric juice has a ph of about 2 and the gastric juice is aqueous Hl. What is the concentration of Hl in the stomach? 2 M Hl B M Hl 0.01 M Hl 0.14 M Hl Ques. no. Question 41 What is the [H 3O + ] of a sweat sample that has a ph = 5.8? M B M M M 42 The ph of a lime is What is the [H 3O + ]? M B M [H 3O + ] =1.9 M M is a whose ph changes very little, when acid or base is added to it? Hypotonic B Hypertonic Buffer mphoteric Most buffers are s composed of approximately equal amount of ? Strong acid and strong base B Weak acid and the salt of its conjugate base Weak acid and weak base Which of the following substances is a buffer HBr and NaBr B HF and KF H 3OOH alone 46 Which buffer has the lowest ph (HF has Ka = )? 0.10 M HF and 0.10 M NaF B 0.20 M HF and 0.10 M NaF 0.20 M HF and 0.20 M NaF all of these Hl and Nal 0.10 M HF and 0.20 M NaF 11

12 47 If two different s of Hl1 and Hl 2 have ph 1 = 3 and ph 2 = 5, respectively. What is the different in their strength [H 3 O + ]? [Hl 1 ]=2 [Hl 2 ] B [Hl 2 ]=2 [Hl 1 ] [Hl 1]=10 2 [Hl 2 ] [Hl 2]=10 2 [Hl 1 ] hydronium ion has the formula H 2 O + B OH H 3O + H 2 + strong acid in is Mostly molecules B Mostly ions The ph of a carbonated drink is Both molecules and ions Less than 7 B More than 7 Equal to 7 Mostly water pprox

13 (hem 108 hapter 9 ) Ques. no. 1 2 Question If the reaction quotient Q K the reaction will. be at equilibrium B Proceed in reverse direction Proceed in forward direction None of the above Which of the following reactions has the equilibrium constant (Kp) equal to partial pressure of O 2 (Kp = P O 2 )? (s)+o 2(g) O 2(g) B ao 3(s) ao (s) + O 2(g) O 2(g) (g) +O 2(g) 2O (g)+o 2(g) 2O 2(g) 3 Increasing pressure for the reaction to? N 2(g)+O 2(g) 2NO (g) its equilibrium will shifted None of the above Forward B Reverse no effect 4 Increasing temperature for the reaction N 2(g)+3H 2(g) 2NH 3(g) ( H=-ve) its equilibrium will shifted to Forward B Reverse no effect None of the above If The actual ratio Q ( reaction quotient) = 0 that means. for the reaction pure reactant B pure product equilibrium None of the above onsider system at 100 N 2 O 4(g) 2 NO 2(g) at 100 K = 11 What is the value of Q starting with 0.2 mole N 2 O 4, 0.2 mole NO 2 in 4 L container. 1.5 B If a chemical system at equilibrium is disturbed, the reaction will proceed in such a direction to overcome the effect of the change. This is.principle Boyl s B vogadro s Le hatelier s welium s Write the equilibrium expression for the reaction For the reaction: SiH 4(g) + 2O 2(g) SiO 2(g) + 2H 2 O (g) K is... [ SiO2(g) ][ 2H2O]2 [ SiH 4(g) ][ 2O 2] B 2 [ SiH4(g) ][ O2]2 [ SiH 4(g) ][ O 2] 2 [ SiH4(g) ][ O2]2 [ SiH 4(g) ][ O 2] 2 Non of previous 13

14 9 If Q < K This means that the reaction proceeds in the forward direction? True B False 10 If Q > K This means that the reaction proceeds in the reverse direction? True B False 11 If Q = K This means that the forward direction equal the reverse direction? True B False 12 If Q < K This means that the reaction proceeds in the reverse direction? True B False 13 If Q > K This means that the reaction proceeds in the forward direction? True B False 14 If a chemical system at equilibrium is disturbed or changed, the reaction will proceed in the direction to overcome the effect of the change. True B False 15 Increasing the pressure on the following equilibrium, which way does the equilibrium shift. N 2(g) + 3 H 2(g) 2 NH 3(g) right B Left no shift None of the above 16 Increasing the pressure on the following equilibrium, which way does the equilibrium shift. SO 2(g) + ½ O 2(g) SO 3(g) right B Left no shift None of the above 17 Increasing the pressure on the following equilibrium, which way does the equilibrium shift. (s) + H 2 O (g) O (g) + H 2 (g) right B Left no shift None of the above 14

15 18 Increasing the pressure on the following equilibrium, which way does the equilibrium shift. N 2(g) + O 2(g) 2NO (g) right B Left no shift None of the above Increasing the pressure on the following equilibrium, which way does the equilibrium shift. 2O 2(g) 2O (g) + O 2(g) 19 right B Left no shift None of the above Increasing the pressure on the following equilibrium, which way does the equilibrium shift. H 2(g) + I 2(s) 2 HI (g) 20 right B Left no shift None of the above 15