MCQ
Insulin has ......... amino acid
- ✓$51$
- B$41$
- C$31$
- D$101$
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| Metal | $Li$ | $Na$ | $K$ | $Mg$ | $Cu$ | $Ag$ | $Fe$ | $Pt$ | $W$ |
| $\phi( eV )$ | $2.4$ | $2.3$ | $2.2$ | $3.7$ | $4.8$ | $4.3$ | $4.7$ | $6.3$ | $4.75$ |
$(a)\,B{r_2}(l) \to B{r_2}(g)$
$(b)\,{H_2}O(s) \to {H_2}O(g)$
$(c)\,{N_2}\,\left[ {1\,atm,\,{{100}\,^o}C} \right] \to {N_2}\,\left[ {1\,atm,\,{{150}\,^o}C} \right]$
$(d)\,{N_2}\,(g) + 3{H_2}(g) \to 2N{H_3}(g)$
$(e)\,CaC{O_3}(s) \to CaO(s) + C{O_2}(g)$
Reason : Covalency of oxygen is two.