MCQ
A large difference between the fourth and fifth ionization energies indicates the presence of
- A$5$ valence electrons in an atom
- B$6$ valence electrons in an atom
- ✓$4$ valence electrons in an atom
- D$8$ valence electrons in an atom
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${C_({graphite)}} + {O_2} \to C{O_2};\,\Delta H = - 393.4\,kJ/mole$
${C_({graphite})} \to {C_{{\rm({diamond})}}};\,\Delta H = $
Reason : Transparent bead $(NaBO_2 + B_2O_3)$ forms coloured bead with coloured cation.
Assertion $A$ : Thin layer chromatography is an adsorption chromatography.
Reason $R$: A thin layer of silica gel is spread over a glass plate of suitable size in thin layer chromatography which acts as an adsorbent. In the light of the above statements, choose the correct answer from the options given below.