The correct statement regarding the following energy diagrams is

• Reaction M is faster and less exothermic than reaction N

• Reaction M is slower and less exothermic than reaction N

• Reaction M is faster and more exothermic than reaction N

• Reaction M is slower and more exothermic than reaction N

At 25°C, the solubility product of salt of MX₂ type is 3.2 × 10^-8 in water. The solubility (in mol/L) of MX₂ in water at the same temperature will be

• 1.2 × 10^-3

• 2 × 10^-3

• 3.2 × 10^-3

• 1.75 × 10^-3

The different colours of litmus in acidic, neutral and basic solutions are, respectively.

• red, orange and blue

• blue, violet and red

• red, colourless and blue

• red, violet and blue

The correct order of equivalent conductances at infinite dilution in water at room temperature for H⁺, K⁺, CH₃COO^- and HO^- ions is

• HO^- > H⁺ > K⁺ > CH₃COO^-

• H⁺ > HO^- > K⁺ > CH₃COO^-

• H⁺ > K⁺ > HO^- > CH₃COO^-

• H⁺ > K⁺ > CH₃COO^- > HO^-

385.

The pH of 10^-4 M KOH solution will be

• 4

• 11

• 10.5

• 10

For a chemical reaction at 27°C, the activation energy is 600 R. The ratio of the rate constants at 327°C to that of at 27°C will be

• 2

• 40

• e

• e²

At 25°C, pH of a 10^-8 M aqueous KOH solution will be

• 6.0

• 7.02

• 8.02

• 9.02

In basic medium the amount of Ni²⁺ in a solution can be estimated with the dimethylglyoxime reagent. The correct statement(s) about the reaction and the product is (are) 

• in a ammoniacal solution Ni²⁺ salts give cherry-red precipitate of nickel (II) dimethylglyoximate

• two dimethylglyoximate units are bound to one Ni²⁺

• in the complex two dimethylglyoximate units are hydrogen bonded to each other

• each dimethylglyoximate unit forms a six membered chelate ring with Ni²⁺

1 x 10^-3 mole of HCl is added to a buffer solution made up of' 0.01 M acetic acid and 0.01 M sodium acetate. The final pH of the buffer (given, pK_a of acetic acid is 4.75 at 25°C)

• 4.60

• 4.66

• 4.75

• 4.8

In 'x' mL 0.3 N HCl, addition of 200 mL distilled water or addition of 100 mL 0.1 N NaOH, gives same final acid strength. Determine 'x'.