11) P 1 = 20 N/cm 2 n 1 = no. moleculess/AvagadroNo. = 6 x 10 23 /6x10 23 = 1 mo
ID: 700618 • Letter: 1
Question
11) P1 = 20 N/cm2 n1 = no. moleculess/AvagadroNo. = 6 x 1023/6x1023 = 1 mol
P2 = ? n2 = 2x 6 x 1023/6x1023 = 2 mol
Therefore, from ideal gas law at constant volume,
P1/n1 = P2/n2
20 N/cm2/1mol = P2/2 mol
Therefore, P2 = 2 x 20 N/cm2 = 40 N/cm2
Hence, the answer is : D (40 N/cm2)
12) Answer is : A
HCl is strong acid and it dissociates completely to give H+ ions. Therefore, HCl wil have
higher concentration of H+ ion and hence, it will have low pH value.
13) Conjugate base of an acid has one proton (H+) less than its acid. Therefore,
after removing one proton from HCl we get Cl-(conjugate base).
Hence, the answer is : B) Cl-
14) P1 = 30 atm ; V1 = 33.3 L ; T1 = 273 oC = 273 + 273.15 = 546.15 K
At STP; P2 = 1 atm ; T2 = 273 K and we need to find V2 = ?
Therefore, from ideal gas law;
P1V1/T1 = P2V2/T2
30 atm x 33.3 L/546.15K = 1 atm x V2/273.15
V2 = 499.5 L
Therefore, the answer is = 499.5 L
Hence, the closest answer is : C) 498 L
Explanation / Answer
. If 50 ml, of 2 N acid ia mixed vith 25 nl of 2 N base. esulting solution will (C A) yield a pH of seven. turn red C) turn blue 1itmus red. D) turn red litmus blue with vith phenolphthalein. The De Broglie equation demonstrated A) that no tvo electrons in the sane at set of four quantum nunbers. B) that momentum was proportional to mass om can have the sane at all matter has both wave and particle characteristics. D) that the energ to the vavelengths of the photons of light the material is capable of absorbing. 10. An atom is found to contain 35 protons, 45 neutrons, and 35 electrons. What is the mass number for this atom? A) 10 B) 35 C) 80 D) 115 t . A gas sample that contains 6 x .1023 nolecules exerts a 16 x 10molecules are ressure of 20 /cm2. If an added to thisgas sample, what will the pressure be? A) 10 N/cm2B) 20 N/cm2 D) 40 N/cm 12. which of the following solutions vill have the lowest M KOH-D)-pure water C) o.1 M/HC3 B) 0.2 M CH 3 COOH A) 0.1 Hel-), lowest P l +(H2O H3O1+ + C11- Which ofthe following is the conjugate-basel of HCl?&) C) H20 33,3L - pressu V- Velu . A gas sample occupies a volume of 33.3 L at 273 c and 0 atm. What volume would this gas sample occupy at A) 0.5 L B) 2L C) 498 L D) 48.5 L 15. The yeakest bond is A) ionic B) covalent C) hydrogen b) van der Waal's h..o cA
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