- A$CuS{O_4}$+ lime
- B$CuS{O_4} + NaOH(aq)$
- C$CuS{O_4} + N{a_2}C{O_3}$
- ✓None of these
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Statement $I$: Aqueous solution of $K _2 Cr _2 O$, is preferred as a primary standard in volumetric analysis over $Na _2 Cr _2 O$, aqueous solution
Statement $II:$ $K _2 Cr _2 O$, has a higher solubility in water than $Na _2 Cr _2 O _7$
In the light of the above statements, choose the correct answer from the options given below:

Statement-$I$ : Noble gases have very high boiling points.
Statement-$II$: Noble gases are monoatomic gases. They are held together by strong dispersion forces. Because of this they are liquefied at very low temperature. Hence, they have very high boiling points. In the light of the above statements. choose the correct answer from the options given below:
(outermost) : [Atomic number of $\mathrm{Eu}=63$ ]