How is 0.0120 written as a scientific notation? from Chemistry S

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 Multiple Choice QuestionsMultiple Choice Questions

231.

The normality of 10 L volume H2O2 is

  • 0.176

  • 0.88

  • 1.78

  • 3.52


232.

Sodium bicarbonate on heating decomposes to form sodium carbonate, CO2 and water. If 0.2 moles of sodium bicarbonate is completely decomposed, how many moles of sodium carbonate is formed?

  • 0.1

  • 0.2

  • 0.05

  • 0.025


233.

250 mL of a Na2CO3 solution contains 2.65 g of Na2CO3 10 mL of this solution is added to x mL of water to obtain 0.001 M Na2CO3 solution.The value of x is (molecular weight of Na2CO3 = 106)

  • 1000 mL

  • 990 mL

  • 9990 mL

  • 90 mL


234.

Which of the following represents the smallest quantity?

  • 1230g

  • 1.230 × 10-4 g

  • 1.230 × 10-6 kg

  • 1.230 × 104 µg


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235.

How is 0.0120 written as a scientific notation?

  • 120 × 10-4

  • 1.2 × 10-2

  • 12 × 10-3

  • 12.0 × 10-3


B.

1.2 × 10-2

0.0120 is written as 1.2 x 10-2, i.e demical is moved two places towards right so that there is only one non-zero digit before the decimal point and the exponent of 10 is -2 in the scientific notation.


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236.

An organic compound crystallises in an ortho rhombic system with two molecules per unit cell. The unit cell dimensions are 12.05, 15.05 and 2.69 Å. If the density of the crystal is 1.419 g cm-3, then molar mass of compound will be 

  • 207 g mol-1

  • 209 g mol-1

  • 308 g mol-1

  • 317 g mol-1


237.

The molarity of a solution in which 5.3 g Na2CO3 is dissolved in 500 mL will be

  • 1.0 M

  • 0.1 M

  • 0.20 M

  • 0.2 M


238.

If 5 L of H2O2 produces 50 L of O2 at NTP, H2O2 is

  • 50 volume

  • 10 volume

  • 5 volume

  • None of the above


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239.

If a LPG cylinder contains mixture of butane and isobutane, then the amount of oxygen that would be required for combustion of 1 kg of it will be

  • 2.50 × 103 gm

  • 4.50 × 103 gm

  • 180  × 103 gm

  • 3.58 × 103 gm


240.

8.50g of NH3 is present in 250ml volume. Its active mass is

  • 1.5 ML-1

  • 2.0 ML-1

  • 1.0 ML-1

  • 0.5 ML-1


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