JEE Main 2017 · Chemistry · s-Block, p-Block Elements and Hydrogen · easy

Consider the statements: (i) thermal stability of carbonates of group 2 increases down the group; (ii) LiNO3 on heating gives Li2O, NO2 and O2; (iii)…

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Consider the statements: (i) thermal stability of carbonates of group 2 increases down the group; (ii)

\mathrm{LiNO_3}

on heating gives

\mathrm{Li_2O}

\mathrm{NO_2}

and

\mathrm{O_2}

; (iii)

\mathrm{Be(OH)_2}

is amphoteric; (iv) the hydration enthalpy of

\mathrm{Na^+}

is more negative than that of

\mathrm{Mg^{2+}}

; (v) solubility of group 2 sulphates increases down the group. The number of correct statements is

A. 5
B. 2
C. 3
D. 4

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Answer: (C) 3

(i) True: larger cations polarise carbonate less, so stability rises down the group. (ii) True: lithium nitrate behaves like group 2 nitrates. (iii) True:

\mathrm{Be(OH)_2}

dissolves in both acid and alkali. (iv) False:

\mathrm{Mg^{2+}}

is smaller and doubly charged, so its hydration enthalpy is much more negative. (v) False: sulphate solubility decreases down the group (

\mathrm{BaSO_4}

is nearly insoluble). So 3 are correct.

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