Equilibrium

The number of  $\mathrm{C}=\mathrm{O}$ groups present in a tripeptide Asp - Glu - Lys is

The incorrect statement(s) among (a) - (d) regarding acid rain is (are):

(a) It can corrode water pipes.

(b) It can damage structures made up of stone.

(c) It cannot cause respiratory ailments in animals

(d) It is not harmful for trees
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A solution of two components containing n₁ moles of the 1st component and n₂ moles of the 2nd component is prepared. M₁ and M₂ are the molecular weights of component 1 and 2 respectively. If d is the density of the solution in gmL⁻¹, C₂ is the molarity and x₂ is the mole fraction of the 2nd component, then C₂ can be expressed as:

For a reaction X + Y = 2Z, 1.0 mol of X, 1.5 mol of Y and 0.5 mol of Z were taken in a 1 L vessel and allowed to react. At equilibrium, the concentration of Z was 1.0 mol L⁻¹. The equilibrium constant of the reaction is x/15. The value of x is

$3\mathrm{g}$ of acetic acid is added to $250\mathrm{m}\mathrm{L}$ of $0.1\mathrm{M}\mathrm{H}\mathrm{C}\mathrm{l}$ and the solution made up to $500\mathrm{m}\mathrm{L}$ . To $20\mathrm{m}\mathrm{L}$ of this solution $1/2\mathrm{m}\mathrm{L}$ of $5\mathrm{M}\mathrm{N}\mathrm{a}\mathrm{O}\mathrm{H}$ is added. The $\mathrm{p}\mathrm{H}$  of the solution is

[Given: ${\mathrm{p}\mathrm{K}}_{\mathrm{a}}$ of acetic acid $=4.75$ , molar mass of acetic acid $=60\mathrm{g}/\mathrm{m}\mathrm{o}\mathrm{l},\mathrm{l}\mathrm{o}\mathrm{g}?3=0.4771$  ] Neglect any changes in volume.