MCQ
Blood is isotonic with
- ✓$0.16 M$ $NaCl$
- BConc. $NaCl$
- C$50 \% $ $NaCl$
- D$30 \%$ $NaCl$
The osmotic concentration of normal saline, $9$ grams $NaCl$ dissolved in water to a total volume of one litre $(0.158\, M )$, is a close approximation to the osmotic concentration of $NaCl$ in blood. Thus, normal saline is isotonic to blood plasma. Both sodium and chloride ions cannot freely pass through the plasma membrane as opposed to urea.
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| Rate constant | Activation energy | |
| Step $1$ | $k_1$ | $E_{a_1} = 180\,kJ /mol$ |
| Step $2$ | $k_2$ | $E_{a_2} = 80\,kJ /mol$ |
| Step $3$ | $k_3$ | $E_{a_3} = 50\,kJ /mol$ |
overall rate constant, $k = {\left( {\frac{{{k_1}{k_2}}}{{{k_3}}}} \right)^{2/3}}$ overall activation energy of the reaction will be ........ $kJ\,mol$