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

The presence of Ag⁺ ion increases the solubility of alkenes due to the formation of :

• d$\mathrm{\pi }$-dσ bonding

• pσ-p$\mathrm{\pi }$ bonding

• p$\mathrm{\pi }-\mathrm{d\pi }$ bonding

• None of the above

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

• CHF₂CH₂CH₂COOH

• CH₃CH₂CF₂COOH

• CH₂FCHFCH₂COOH

• CH₃CF₂CH₂COOH

Commercial 11.2 volume H₂O₂ solution has a molarity of :

• 1.0

• 0.5

• 11.2

• 1.12

Which one of the following oxides is amphoteric ?

• ZnO

• MgO

• CaO

• CO₂

Each B - H - B bridge in B₂H₆ is formed by the sharing of:

• 2 electrons

• 4 electrons

• 1 electron

• 3 electrons

Which carbon is more electronegative ?

• sp³ - hybridised carbon

• sp - hybridised carbon

• sp² - hybridised carbon

• Always same irrespective of its hybrid state

20.

In Lassaigne's test, a blue colour is obtained if the organic compound contains nitrogen. The blue colour is due to

• K₄[Fe(CN)₆]

• Fe₄[Fe(CN)₆]₃

• Na₃[Fe(CN)₆]

• Cu₂[Fe(CN)₆]