For alkali metals, which one of the following trends is incorrect ?

(a)

Hydration energy: Li > Na > K > Rb

(b)

Ionisation energy: Li > Na > K > Rb

(c)

Density: Li < Na < K < Rb

(d)

Atomic size: Li < Na < K < Rb

Which of the following compounds will not evolve H₂ gas on reaction with alkali metals ?

(a)

ethanoic acid

(b)

ethanol

(c)

phenol

(d)

none of these

Lithium shows diagonal relationship with _____________

(a)

sodium

(b)

magnesium

(c)

calcium

(d)

aluminium

The radio active element of group 1 is ______

(a)

rubidium

(b)

cesium

(c)

francium

(d)

radium

Half life of francium is _______

(a)

12.3 years

(b)

12.3 mins

(c)

21 years

(d)

21 mins

How is plaster of paris prepared ?

An alkali metal (x) forms a hydrated sulphate, X₂SO₄ • 10 H₂O. Is the metal more likely to be sodium (or) potassium.

Why alkali metals do not occur free in native?

Explain the following:
The second ionisation enthalpy values of alkali metals are high.

Mention the uses of lithium.

Give the systematic names for the following
Milk of magnesia

Write the chemical equations for the reactions involved in solvay process of preparation of sodium carbonate.

Why are potassium and caesium, rather than lithium used in photochemical cells?

List down the uses of washing soda

Why group 2 elements have positive electron gain enthalpy?

Describe briefly the biological Importance of Calcium and magnesium.

List out the uses of alkali metals

The hydrides of alkali metals behave as strong reducing agents - Justify the statement.

Discuss the similarities between beryllium and aluminium.