The calculated mass of 20Ca40 is 40.328 u. It releases 306.3 MeV

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 Multiple Choice QuestionsMultiple Choice Questions

41.

What amount of bromine will be required to convert 2 g of phenol into 2, 4, 6-tribromo phenol?

  • 4.00

  • 6.00

  • 10.22

  • 20.44


42.

What is the amount of urea dissolved per litre, if aqueous solution is isotonic with 10% cane sugar solution (mol. wt. of urea = 60) ?

  • 200 g/L

  • 19.2 g/L

  • 17.54 g/L

  • 16.7 g/L


43.

The volume of 2 N H2SO4 solution is 0.1 dm3. The volume of its decinormal solution (in dm3) will be

  • 0.1

  • 0.2

  • 2

  • 1.7


44.

The percentage (by weight) of sodium hydroxide in a 1.25 molal NaOH solution is

  • 4.76%

  • 1.25%

  • 5%

  • 40%


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45.

The calculated mass of 20Ca40 is 40.328 u. It releases 306.3 MeV energy in a nuclear process. Its isotopic mass is

  • 39.998

  • 40.6570

  • 0.3290

  • 2.85 × 104


A.

39.998

BE = m × 931 MeV

306.3 = m × 931

m = 0.3290

m = calculated mass - isotopic mass

-Isotopic mass = m - calculated mass

                      = 0.3290 - 40.328

                      = -39.998

Therefore, Isotopic mass = 39.998


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46.

Which of the following concentration factors is affected by change in temperature?

  • Molarity

  • Molality

  • Mole fraction

  • Weight fraction


47.

An aqueous solution of urea containing 18g urea in 1500 cm3 of the solution has a density equal to 1.052. If the molecular weight of urea is 60, the molality of the solution is

  • 0.200

  • 0.192

  • 0.100

  • 1.200


48.

What volume of 2M H2SO4 is required to form 0.2 N of 100 mL of solution?

  • 5 mL

  • 20 mL

  • 10 mL

  • 50 mL


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49.

How many gram-equivalents of NaOH are required to neutralise 25 cm3 of a decinormal HCl solution?

  • 0.00125

  • 0.0025

  • 0.0050

  • 0.025


50.

1 mol alcohol reacts with Na to give what weight of hydrogen ?

  • 1 gm

  • 2 gm

  • 3 gm

  • 3.5 gm


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