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The elements of group $$1$$ describe, more clearly than any other group of elements, the effects increasing the size of atoms or ions on the physical and chemical properties. The chemical and physical properties of the elements are closely related to their electronic structures and sizes. These metals are highly electropositive and thus form very strong bases, and have quite stable oxo-salts. In the manufacturing of sodium hydroxide, chlorine and sodium carbonate, the sodium chloride is used as starting material.
Which of the following has the highest solubility in water?

A
$$CsOH$$
B
$$RbOH$$
C
$$LiOH$$
D
$$KOH$$
Solution
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Correct option is C. $$CsOH$$
Down the group the change in lattice energy is more than that of hydration energy.
Cs is at the bottom of alkali metals. Hence $$CsOH$$ has the highest solubility in water.

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Q1
The elements of group $$1$$ describe, more clearly than any other group of elements, the effects increasing the size of atoms or ions on the physical and chemical properties. The chemical and physical properties of the elements are closely related to their electronic structures and sizes. These metals are highly electropositive and thus form very strong bases, and have quite stable oxo-salts. In the manufacturing of sodium hydroxide, chlorine and sodium carbonate, the sodium chloride is used as starting material.
Which of the following has the highest solubility in water?
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Q2
Comprehension:
The elements of group 1 describe, more clearly than any other group of elements, the effects of increasing the size of atoms or ions on the physical and chemical properties. The chemical and physical properties of the elements are closely related to their electronic structures and sizes. These metals are highly electropositive and thus form very strong bases, and have quite stable oxo-salts. In the manufacturing of sodium hydroxide, chlorine and sodium carbonate, the sodium chloride is used as starting material.

Which of the following acts as an oxidising as well as reducing agent ?
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Q3
The elements of group 1 describe, more clearly than any other group of elements, the effects of increasing the size of atoms or ions on the physical and chemical properties. The chemical and physical properties of the elements are closely related to their electronic structures and sizes. These metals are highly electropositive and thus from very strong bases, and have quite stable oxo-salts. In the manufacturing of sodium hydroxide, chlorine, and sodium carbonate, sodium chloride is used as a starting material.
Which of the following acts an oxidising as well as reducing agent
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Q4
The elements of group $$1$$ describe, more clearly than any other group of elements, the effects increasing the size of atoms or ions on the physical and chemical properties. The chemical and physical properties of the elements are closely related to their electronic structures and sizes. These metals are highly electropositive and thus form very strong bases, and have quite stable oxo-salts. In the manufacturing of sodium hydroxide, chlorine and sodium carbonate, the sodium chloride is used as starting material.
The following compounds have been arranged in the order of their increasing thermal stabilities. Identify the correct order,
$$K_{2}CO_{3}\left(I\right), Na_{2}CO_{3}\left(II\right), Rb_{2}CO_{3}\left(III\right), Li_{2}CO_{3}\left(IV\right)$$
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Q5
The elements of group 1 describe, more clearly than any other group of elements, the effects of increasing the size of atoms or ions on the physical and chemical properties. The chemical and physical properties of the elements are closely related to their electronic structures and sizes. These metals are highly electropositive and thus form very strong bases, and have quite stable oxo-salts. In the manufacturing of sodium hydroxide, chlorine and sodium carbonate, the sodium chloride is used as starting material.
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(1) basic strength of oxides ; Cs2O<Rb2O<K2O<Na2O<Li2O
(2) Stability of peroxides ; Na2O2<K2O2<Rb2O2<Cs2O2
(3) Stability of bicarbonates ; LiHCO3<NaHCO3<KHCO3<RbHCO3<CsHCO3
(4) Melting point ; NaF<NaCI<NaBr<NaI


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