MCQ
Element showing the phenomenon of allotropy is
- AAluminium
- ✓Tin
- CLead
- DCopper
$\beta$-tin (the metallic form, or white tin), which is stable at and above room temperature, is malleable. In contrast, $\alpha$-tin (nonmetallic form, or gray tin), which is stable below $13.2^{\circ} C \left(55.8^{\circ} F \right)$, is brittle.
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$\mathrm{HF}, \mathrm{H}_2, \mathrm{H}_2 \mathrm{~S}, \mathrm{CO}_2, \mathrm{NH}_3, \mathrm{BF}_3, \mathrm{CH}_4, \mathrm{CHCl}_3, \mathrm{SiF}_4$, $\mathrm{H}_2 \mathrm{O}, \mathrm{BeF}_2$
$(I)$ $B + AN{O_3} \longrightarrow BN{O_3} + A$
$(II)$ $A + HCl \longrightarrow ACl + \frac{1}{2}\,{H_2}$
$(III)$ $D + ECl \longrightarrow DCl + E$
$(IV)$ $D + HN{O_3} \longrightarrow {H_2}$ gas is not evolved
When $P$ is going to form $PF_5$, then these radial distances are going to become arbitrarily ____,____and ____ respectively