- Aortho-nitrophenol
- Bpara-chlorophenol
- ✓para-nitrophenol
- Dmeta-nitrophenol

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$(A)$ All are isoelectronic
$(B)$ All have the same nuclear charge
$(C)$ $\mathrm{O}^{2-}$ has the largest ionic radii
$(D)$ $\mathrm{Mg}^{2+}$ has the smallest ionic radii
Choose the most appropriate answer from the options given below :
Total sum of oxygen atoms in Product $A$ and Product $B$ are .........
$(A)$ Hydrated $Al _2 O _3$ precipitates, when $CO _2$ is bubbled through a solution of sodium aluminate.
$(B)$ Addition of $Na _3 AlF _6$ lowers the melting point of alumina.
$(C)$ $CO _2$ is evolved at the anode during electrolysis.
$(D)$ The cathode is a steel vessel with a lining of carbon.
$A$. Atoms of all elements are composed of two fundamental particles.
$B$. The mass of the electron is $9.10939 \times 10^{-31} kg$.
$C$. All the isotopes of a given element show same chemical properties:
$D$. Protons and electrons are collectively known as nucleons.
$E$. Dalton's atomic theory, regarded the atom as an ultimate particles of matter Choose the correct answer from the options given below