Observe the following statements.
Statement I Both LiF and CsI have low solubility in water.
Statement II Low solubility of LiF in water is due to smaller hydration enthalpy of ions and that of CsI is due to its high lattice enthalpy.
The correct answer is
In which of the following the $s$-block elements are arranged in the correct order of their melting points?
The correct statements about the compounds of boron are
I. In borax bead test, the colour of cobalt metaborate is blue.
II. Diborane is prepared by the oxidation of sodium borohydride with iodine.
III. In diborane oxidation state of hydrogen is +1 .
IV. Boric acid is a tribasic acid.
Dehydration of an organic acid $X$ with concentrated $\mathrm{H}_2 \mathrm{SO}_4$ at 373 K gives $\mathrm{H}_2 \mathrm{O}$ and gas $Y$. The hybridisation of the carbon in $Y$ and nature of $Y$ are respectively.
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