1. Tardigrade
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  4. The correct solubility order is/are I. CaCO3>SrCO3>BaCO3 II. Li2CO3 < Na2CO3 < K2CO3 III. K2CO3 < Rb2CO3 < Cs2CO3 IV. Na2CO3>K2CO3>Rb2CO3

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Q. The correct solubility order is/are

I. $CaCO_{3}>SrCO_{3}>BaCO_{3}$

II. $Li_{2}CO_{3} < Na_{2}CO_{3} < K_{2}CO_{3}$

III. $K_{2}CO_{3} < Rb_{2}CO_{3} < Cs_{2}CO_{3}$

IV. $Na_{2}CO_{3}>K_{2}CO_{3}>Rb_{2}CO_{3}$

NTA AbhyasNTA Abhyas 2020The s-Block Elements

Solution:

As in case of alkali metals solubility increases down the group but decreases for alkaline earth metals.

Here the correct orders of solubility are

I. $CaCO_{3}>SrCO_{3}>BaCO_{3}$

II. $Li_{2}CO_{3} < Na_{2}CO_{3} < K_{2}CO_{3}$

III. $K_{2}CO_{3} < Rb_{2}CO_{3} < Cs_{2}CO_{3}$