If the molality of the dilute solution is doubled, the value of molal depression constant (Kf) will be-
1. Halved
2. Tripled
3. Unchanged
4. Doubled
1. Halved
2. Tripled
3. Unchanged
4. Doubled
Which of the following is dependent on temperature?
| 1. | Molarity | 2. | Mole fraction |
| 3. | Weight percentage | 4. | Molality |
The incorrect statement among the following is:
| 1. | The value of the equilibrium constant is changed in the presence of a catalyst |
| 2. | Enzymes catalyse mainly bio-chemical reactions |
| 3. | Coenzymes increase the catalytic activity of the enzyme |
| 4. | The catalyst does not initiate any reaction |
The correct order of the stoichiometries of AgCl formed when AgNO3 in excess is treated with the complexes
CoCl3.6NH3, CoCl3.5NH3, CoCl3.4NH3 respectively is:
| 1. | 3AgCl, 1AgCl, 2AgCl | 2. | 3AgCl, 2AgCl, 1AgCl |
| 3. | 2AgCl, 3AgCl, 1AgCl | 4. | 1AgCl, 3AgCl, 2AgCl |
The correct statement regarding electrophile is :
| 1. | Electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from another electrophile |
| 2. | Electrophiles are generally neutral species and can form a bond by accepting a pair of electrons from a nucleophile |
| 3. | Electrophiles can be either neutral or positively charged species and can form a bond accepting a pair of electrons from a nucleophile |
| 4. | Electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from a nucleophile |
A gas is allowed to expand in a well-insulated container against a constant external pressure of 2.5atm from an initial volume of 2.50 L to a final volume of 4.50L. The change in internal energy U of the gas in joules will be:
| 1. | –500J | 2. | –505J |
| 3. | –506J | 4. | –508J |
Mark the correct reaction among the following to convert acetamide to methenamine:
1. Hoffmann bromamide reaction
2. Stephens reaction
3. Gabriels phthalimide synthesis
4. Carbylamine reaction
With respect to the conformers of ethane, which of the following statements is true?
| 1. | Bond angle changes but bond length remains the same. |
| 2. | Both bond angle and bond length change. |
| 3. | Both bond angle and bond length remain the same. |
| 4. | Bond angle remains the same but the bond length changes. |
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