MCQ
Which of the following has maximum mass
- A$0.1\ g$ atom of $C$
- B$0.1\ mole$ of $NH_3$
- C$6.02 × 10^{22}$ molecule of $H_2$ gas
- ✓$1120\ ml$ of $CO_2$ at $1\ atm, 273\ K$
$22400 = 44$
$1120 = \frac {1120}{22400} \times 44 = 2.2\ g$
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Major product $(A)$ of the above reaction
$\Delta {H^o}\, = \, +234.1\,\,kJ$
$C(s)\, + {O_2}(g)\, \to \,\,C{O_2}(g)$
Use these equation and $\Delta H^o$ value to calculate $\Delta H^o$ for this reaction:
$4Fe(s) + 3O_2(g) \to 2Fe_2O_3(s)$
.....$kJ$
Statement $I$ : Boron is extremely hard indicating its high lattice energy
Statement $II$ : Boron has highest melting and boiling point compared to its other group members.
In the light of the above statements, choose the most appropriate answer from the options given below