An acid solution of pH = 6 is diluted 1000 times, the pH of the f

Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

Uncertainty in the position of an electron (mass= 9.1 x 10-31 kg) moving with a velocity 300 ms-1 accurate upon 0.001 % will be (h = 6.63 x 10-34 J-s)

  • 19.2 x 10-2 m

  • 5.76 x 10-2 m

  • 1.92 x 10-2 m

  • 3.84 x 10-2 m


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12.

An acid solution of pH = 6 is diluted 1000 times, the pH of the final solution becomes

  • 6.01

  • 9

  • 3.5

  • 6.99


D.

6.99

pH =6   [H+] = 10-6MAfter dilution  [H+] =10-61000= 10-9M   [H+]  from H2O cannot be neglected.Total  [H+] =  10-9 + 10-7                   = 10-7 (10-2+1)                   = 10-7(1.01)pH=-log (1.01 × 10-7)     = 7 - 0.0043    = 6.9957


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13.

When Zn is treated with excess of NaOH, the product obtained is

  • Zn(OH)2

  • ZnOH

  • Na2ZnO2

  • None of the above


14.

The common basic structural unit in silicates and silica is

  • SiO64-

  • SiO32-

  • SiO44-

  • Si2O76-


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15.

Which of the following species is an electrophile?

  • H2O

  • NH3

  • C2H5OH

  • SO3


16.


17.

Which of the following compounds do not give different isomers on monochlorination?

  • Neo-pentane

  • n-butane

  • Iso-butane

  • Iso-pentane


18.

34.2 g of cane sugar is dissolved in 180 g of water. The relative lowering of vapour pressure will be

  • 0.0099

  • 1.1597

  • 0.840

  • 0.9901


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19.

In a multistep reaction, the overall rate of reaction is equal to the

  • rate of slowest step

  • rate of fastest step

  • average rate of various step

  • the rate of last step


20.

According to Hess's law, the heat of reaction depends upon

  • initial condition of reactants

  • initial and final conditions of reactants

  • intermediate path of the reaction

  • end conditions of reactants


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