MCQ
By knowing the number of protons in a neutral atom, one can determine:
- AThe identity of the element.
- BThe number of neutrons in the atom.
- CThe number of common isotopes of the element.
- DThe atomic radius size.
Explanation:
In a neutral atom, the number of protons is always the atomic number of the element and uniquely identifies the element. and in this, the number of positive protons and negative electrons is always equal.
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$3 HC \equiv CH _{( g )} \rightleftharpoons C _{6} H _{6(\ell)}$
[Given: $\Delta_{f} G ^{\circ}( HC \equiv CH )=-2.04 \times 10^{5}\, J mol ^{-1}$
$\Delta_{f} G ^{\circ}\left( C _{6} H _{6}\right)=-1.24 \times 10^{5}\, J mol ^{-1} ; R =8.314\,\left. J K ^{-1} mol ^{-1}\right]$
Amongst the above molecule(s)/ion(s), the number of molecule(s)/1on(s) having $sp ^{3} d ^{2}$ hybridisation is $........$
