MCQ
Helium was discovered by
- ACrooks
- BRutherford
- ✓Frankland and Lockyer
- DDorn
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$(i)$ $F_2 + 2X^-\to 2F^-+ X_2 (X = Cl, Br, I)$
$(ii)$ $Cl_2 + 2X^-\to 2Cl^-+ X_2 (X = Br, I)$
$(iii)$ $I_2 + 2Br^-\to Br_2 + 2I^-$
option which have only the Correct set of reaction is.
$CoCl_3 \cdot 6NH_3, CoCl_3 \cdot 5NH_3,CoCl_3\cdot 4NH_3$ respectively is
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