A(g)    +  3B(g)   

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 Multiple Choice QuestionsMultiple Choice Questions

161.

The strongest base among the following is

  • C6H5NH2

  • (C6H5)2NH

  • NH3

  • (C2H5)2NH


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162.

A(g)    +  3B(g)     4C(g) .Initially concentration of A is equal to that of B. The equilibrium concentrations of A and C are equal. Kc is 

  • 0.08

  • 0.8

  • 8

  • 80


C.

8

A(g)    +          3B(g)        4C(g) 1                         1                        0  (initial concentration)(1-x)             (1-x)                   4x(finalconcentration)( atequilibrium)According to question,  1-x= 4x                 x=15For above reactionKc =[C]4[A][B]3= (4x)4(1 - x) (1 - 3x)3Kc =4×1541-151-3×153 =8.0


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163.

Match List-I with List-II Choose the correct matching codes from the choices given.
List - I (Hydride) List - II (Type of hydride)
A. BeH2 1. Complex
B. AsH3 2. Lewis acid
C. B2H6 3. Interstitial
D. LaH3 4. Covalent
E. LiAlH4

5. Intermediate

6. Ionic

  • A - 6; B - 2; C - 4; D - 5; E - 1

  • A - 5; B - 4; C - 2; D - 3; E - 1

  • A - 6; B - 4; C - 2; D - 3; E - 5

  • A - 6; B - 4; C - 2; D - 3; E - 1


164.

Two moles of PCl5, is heated in a closed vessel of 2 L capacity. When the equilibrium is attained 40% of it has been found to be dissociated. What is the Kc in mol/dm3?

  • 0.532

  • 0.266

  • 0.133

  • 0.174


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165.

The equilibrium constant for the reaction

2NO2 (g)  2NO (g) + O2 (g) is 2 × 10-6 at 185°C. Then the equilibrium constant for the reaction,

4NO (g) + 2O2 (g)  2NO2 (g) at the same temperature would be

  • 2.5 × 10-5

  • 4 × 10-12

  • 2.5 × 1011

  • 2 × 106


166.

The dissociation constant of acetic acid Ka is 1.74 × 10-5 at 298 K. The pH of a solution of 0.1 M acetic acid is :

  • 2.88

  • 3.6

  • 4.0

  • 1.0


167.

0.365g of HCl gas was passed through 100 cm3 of 0.2 M NaOH solution. The pH of the resulting solution would be :

  • 13

  • 9

  • 8

  • 5


168.

In the given reaction,

2X (g) + Y (g)  2Z (g) + 80 kcal

Which combination of pressure and temperature will give the highest yield of Z at equilibrium?

  • 1000 atm and 200°C

  • 500 atm and 500°C

  • 1000 atm and 100°C

  • 500 atm and 100°C


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169.

Which of the following compounds would have the smallest value for pKa?

  • CHF2CH2CH2COOH

  • CH3CH2CF2COOH

  • CH2FCHFCH2COOH

  • CH3CF2CH2COOH


170.

A saturated solution of CaF2 is 2 × 10-4 mol/ L. Its solubility product constant is:

  • 2.6 × 10-9

  • 4 × 10-8

  • 8 × 10-12

  • 3.2 × 10-11


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