MCQ
How many $EDTA$ molecules are required to make an octahedral complex with a $Ca^{2+}$ ion?
- A$6$
- B$3$
- ✓$1$
- D$2$
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$A.$ The electron gain enthalpy of $F$ is more negative than that of $Cl$
$B.$ Ionization enthalpy decreases in a group of periodic table
$C.$ The electronegativity of an atom depends upon the atoms bonded to it.
$D.$ $Al _2 O _3$ and $NO$ are examples of amphoteric oxides.
Choose the most appropriate answer from the options given below:
$CH _{2} = C = C H - C H _{3}$
$\quad 1\quad \quad 2\quad \quad 3\quad \quad \quad 4$
molecule, the hybridization of carbon $1,2,3$ and $4$ respectively are :
[Atomic mass: $\mathrm{Ag}=108, \mathrm{Br}=80$ ]