MCQ
As you go down in a group, the alkali metals become:
- ABrighter
- BHotter
- CMore reactive
- DLess reactive
Explanation:
Alkali metals are the elements present in group 1 in the periodic table.
They are very reactive metals and their reactivity increases as we move down the group from top to bottom because of an increase in the atomic size.
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| $\Delta H \,(kJ/mol)$ | |
| $\frac 12 A \rightarrow B$ | $+150$ |
| $3B \rightarrow 2C + D$ | $-125$ |
| $E + A \rightarrow 2D$ | $+350$ |
For $B + D \rightarrow E + 2C, \Delta H$ will be ............. $\mathrm{kJ/mol}$