The volume of oxygen evolved at STP by decomposition of 0.68 g '2

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 Multiple Choice QuestionsMultiple Choice Questions

51.

One atomic mass is equal to

  • 1.66 × 10-27 g

  • 1.66 × 10-24 g

  • 1.66 × 10-23 g

  • 1.66 × 1025 g


52.

1 u (amu) is equal to

  • 1.492 × 10-10 J

  • 1.492 × 10-7 J

  • 1.492 × 10-13 J

  • 6.023 × 1023 J


53.

450 mg of glucose is dissolved in 100 g of solvent. What is the molality of solution?

  • 0.0025 m

  • 0.025 m

  • 0.25 m

  • 2.5 m


54.

2.5 cm3 of 0.2 M H2SO4 solution is diluted to 0.5 dm3. Find normality of the diluted solution?

  • 0.2 N

  • 0.02 N

  • 0.002 N

  • 0.04 N


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55.

The molar concentration of chloride ions in the resulting solution of 300 mL of 3.0 M NaCl and 200 mL of 4.0 M BaCl2 will be

  • 1.7 M

  • 1.8 M

  • 5.0 M

  • 3.5 M


56.

The volume concentration of hydrogen peroxide having 6.8% concentration will be

  • 5

  • 11.2

  • 22.4

  • 20


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57.

The volume of oxygen evolved at STP by decomposition of 0.68 g '20 volume' hydrogen peroxide solution is

  • 2.24mL

  • 22.4mL

  • 224mL

  • 2240mL


C.

224mL

2H2O22mol                    2H2O+  + O2 1 mol=2 ×34 = 68g                        22400 mL At STP, 68 g H2O2  produced      O2 = 22400 mL At STP, 0.68g H2O2 will produce   O2 =22400 × 0.6868= 224mL


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58.

What is the molality of a solution containing 200 mg of urea (molar mass 60 g mol-1) dissolved in 40 g of water?

  • 0.0825

  • 0.825

  • 0.498

  • 0.0013


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59.

What is the mass of one molecule of yellow phosphorus? (Atomic mass, P = 30)

  • 1.993 × 10-22 kg

  • 1.993 × 10-19 mg

  • 4.983 × 10-20 kg

  • 4.983 × 10-23 mg


60.

What is the volume of water consumed during acid hydrolysis of 1.368 kg of sucrose?

(Given : molar masses of sucrose = 342, water = 18, density of water = 1g/cm3)

  • 0.072 dm3

  • 0.070 dm3

  • 0.18 dm3

  • 0.018 dm3


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