40 mL of 0.1 M ammonia solution is mixed with 20 mL. of 0.1 M HCl

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 Multiple Choice QuestionsMultiple Choice Questions

631.

Least ionised salt is :

  • KCl

  • AgCl

  • MgCl2

  • CaCl2


632.

Which among the following is an electron deficient compound ?

  • NF3

  • PF3

  • BF3

  • AsF3


633.

The solubility of in water is Sb2S3 in water is 1.0 x 10-5 mol/litre at 298 K .What will be its solubility product ?

  • 108 x 10-25

  • 1.0 x 10-25

  • 144 x 10-25

  • 126 x 10-25


634.

What will be the pH value of 0.05 M Ba(OH)2 solution ?

  • 12

  • 13

  • 1

  • 12.96


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635.

Ionisation depends upon :

  • pressure

  • volume

  • dilution

  • none of these


636.

Which of the following salt does not get hydrolysed in water ?

  • KClO4

  • NH4Cl

  • CH3COONa

  • None of these


637.

In the reaction :

H2 + I2  2HI

In a 2 litre flask 0.4 moles of each H2 and I2 are taken .At equilibrium 0.5 moles of HI are formed .What will be the value of equilibrium constant ,Kc ?

  • 20.2

  • 25.4

  • 0.284

  • 11.11


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638.

40 mL of 0.1 M ammonia solution is mixed with 20 mL. of 0.1 M HCl. What is the pH of the mixture? (pKb, of ammonia solution is 4.74)

  • 4.74

  • 2.26

  • 9.26

  • 5.00


C.

9.26

40 mL of 0.1 M ammonia solution= 40 x 0.1 = 4 milliequivalent ammonia solution.

20 mL. of 0.1M HCl =20 x 0.1 =2 milli equivalent of HCl

                       NH4OH + HCl   NH4Cl + H2O

Initial milli-eqv.     4        2           0

Milli-eqv. after     4-2       0           2

                          =2

pOH = pKb + log[NH4Cl][NH4OH]=4.72 + log22         = 4.74 + log 1= 4.74   pH = 14- 4.74 =9.26


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639.

KI and CuSO4 solution when mixed , give :

  • CuI2 + K2SO4

  • Cu2I2 + K2SO4

  • K2SO+ Cu2I2 + I2

  • K2SO+ CuI2 + I2


640.

Which of the following is a Lewis base ?

  • NaOH

  • NH3

  • BCl3

  • All of these


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