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Herbicide DCMU [(3-C, 3, 4-dichloropheny...

Herbicide `DCMU` [(3-C, 3, 4-dichlorophenyl) -1, 1-dimethyl urea] kills plants due to stoppage of

A

Photophosphorylation

B

Rubisco activity

C

Electron transport

D

`O_(2)`-evolution.

Text Solution

Verified by Experts

The correct Answer is:
D
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Addition of non-volatile solute to a solvent always increases the colligative properties such as osmotic pressure. Delta P . Delta T_b and Delta T_f . All these colligative properties are directly proportional to molality if solutions are dilute. The increases in colligative properties on addition of non-volatile solute is due to increases in number of solute particles. For different aqueous solutions of 0.1 N NaCI, 0.1 N urea, 0.1 N Na_2SO_4 and 0.1 N Na_3PO_4 solution at 27^@C , the correct statements are : 1. The order of osmotic pressure is NaCI = Na_2SO_4 = Na_3PO_4 = urea 2. pi = (Delta T_b)/k_b xx RT for urea solution 3. Addition of salt on ice increases its melting point 4. Addition of salt on ice bring in melting of ice earlier