15. 300 mL of 6.0 M glucose solution is diluted to 600 mL water. What is the new
ID: 553511 • Letter: 1
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15. 300 mL of 6.0 M glucose solution is diluted to 600 mL water. What is the new molarity of the glucose solution? A) 1.5 M B) 2.0 M C)3.0 M D) 6.0 M 16. Which of the following is not a unit used to measure pressure? A) atm B) mm Hg C) torr D) Kilopascal E. kelvin A gas mixture containing oxygen, nitrogen and neon exerts a total pressure of 1.70 atm. If helium is added to the mixture it increases the pressure to 2.00 atm. What is the partial pressure of the helium? A) 0.30 atm B) 0.80 atm C) 1.20 atm D) 2.00 atm E) 3.70 atm 17. nship between volume and pressure at constant temperature The gas law which gives the relatio and amount of gas is A) Avogadro's Law D) Dalton's Law 18. C) Ideal gas Law B) Charles' Law E) Boyle's Law Which of the following pressure measurements is not equal to the others? A) 760 torr D) 1 atm 19. C) 101 KPa B) 76.0 cm Hg E) all are equal to each other 20. An anesthetic consists of a mixture of cyclopropane gas, C3Hs, and oxygen gas, O2. If the mixture has a total pressure of 1.10 atm, and the partial pressure of the cyclopropane is 86.0 torr, what is the partial pressure of the oxygen in the anesthetic? A) 1.10 torr B)11 torr C) 750 torr D) 760 torT E) 836 torr What is the molar mass of Ca0? A) 40.1 g 21. B) 56.1 gC) 74.1g D) 148.2 g E) none of these An unsaturated solution of NaCl at room temperature can dissolve additional A. True 22. B. False Which of the following ionic compounds is soluble in water? A) lead sulfate (PbSO4) C) silver chloride (AgCI) 23. B) Calcium carbonate (CaCO3) D) sodium nitrate (NaNO;) 24. Which of the following is a nonelectrolyte? A)KI B) NaOH C) HNO D) C2H2201 E) Cao Determine the oxidation number of manganese in KMnO4 A) 2 25. D) 7 E) none of theseExplanation / Answer
Ans. #15. Using C1V1(stock solution) = C2V2 (diluted solution)
Or, 6.0 M x 300.0 mL = C2 x 600.0 mL
Or, C2 = (6.0 M x 300.0 mL) / 600.0 mL = 3.0 M
Hence, correct option is- C. 30. M
#16. Correct option. E. kelvin. kelvin is an unit of temperature.
#17. Pressure exerted by He alone = Final pressure - Initial pressure
= 2.0 atm – 1.7 atm
= 0.3 atm
Now,
Partial pressure of of He = Pressure exerted by He / Total pressure
= 0.3 atm / 2.0 atm
= 0.15
None of the options are correct. “Partial” pressure is a “unit less” quantity, so it shall not be expressed in term of “atm”.
#18. Correct option. E. Boyle’s Law.
Boyle’s Law: For a gas at constant temperature confined in a closed vessel, the product of pressure and volume is a constant. That is, PV = Constant - Temperature kept constant’
P1V1 = P2V2 - T, n constant
Avogadro’s Law – Equal volume of all gases have equal number of moles, at constant pressure and temperature.
n1V1 = n2V2 -P, T constant
Charles’ Law: Volume (V) of a gas in a closed vessel is directly proportional to absolute temperature (T).
Daltons’ law (of partial pressure)- the total pressure of a gaseous mixture is equal to the sum of pressure of the individual gases (say, p1 for gas 1, p2 for gas 2, etc.).
Total pressure, P = p1 + p2 + p3
Idea gas Law, pV = nRT (p, V, n and T are variables)
#19. Correct option. E.
760 mmHg= 1.0 atm
76.0 cm Hg = 760 mmHg = 1.0 atm
101 kPa = 1.0 atm
#20. Correct option. C
Total pressure = 1.10 atm = 1.10 x (760 torr) = 836 torr
Pressure of cyclopropane = 86.0 torr
Now,
Pressure of O2 = Total pressure – Pressure of cyclopropane
= 836 torr – 86 torr
= 750 torr
#21. Correct option. B.
Molar mass of CaO = 56.0774 g/mol
#22. True.
An unsaturated solution of any solute can dissolve some amount of the same solute till saturation is achieved.
#23. Correct option. D.
Being salt of strong acid (HNO3) and strong base (NaOH), the salt NaNO3 completely dissociates into its ions Na+ and NO3- in water.
#24. Correct option, D.
Sucrose, C12H22O11 is a non-electrolyte, i.e. it does not dissociates into ion when dissolved in water.
#25. Correct option. D.
Oxygen always has oxidation number of -2 (except peroxides, where its oxidation number is -1).
Group 1 elements, here K, always have oxidation number of +1.
A compound is electrically neutral, i.e. has a net charge of zero (0).
Now,
Let the oxidation number of Mn = X
Net charge on compound = 0 = Sum of charges on all chemical species
Or, 0 = (+1) + X + [4 x (-2)]
Or, 0 = 1 + X – 8
Or, X = +7
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