The strongest base among the following is

• C₆H₅NH₂

• (C₆H₅)₂NH

• NH₃

• (C₂H₅)₂NH

$\mathrm{A}\left(\mathrm{g}\right) + 3\mathrm{B}\left(\mathrm{g}\right)\hspace{0.17em} \rightleftharpoons 4\mathrm{C}\left(\mathrm{g}\right)$.Initially concentration of A is equal to that of B. The equilibrium concentrations of A and C are equal. K_c is 

• 0.08

• 0.8

• 8

• 80

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

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 K_c in mol/dm³?

• 0.532

• 0.266

• 0.133

• 0.174

The equilibrium constant for the reaction

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

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

• 2.5 × 10^-5

• 4 × 10^-12

• 2.5 × 10¹¹

• 2 × 10⁶

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

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

In the given reaction,

2X (g) + Y (g) $\rightleftharpoons$ 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

169.

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

• CHF₂CH₂CH₂COOH

• CH₃CH₂CF₂COOH

• CH₂FCHFCH₂COOH

• CH₃CF₂CH₂COOH

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