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

RbO₂ is _____________

(a)

superoxide and paramagnetic

(b)

peroxide and diamagnetic

(c)

superoxide and diamagnetic

(d)

peroxide and paramagnetic

Lithium shows diagonal relationship with _____________

(a)

sodium

(b)

magnesium

(c)

calcium

(d)

aluminium

In which process, fused sodium hydroxide is electrolysed for extraction of sodium ?

(a)

Castner's process

(b)

Cyanide process

(c)

Down process

(d)

All of these

The product obtained as a result of a reaction of nitrogen with CaC₂ is ___________

(a)

Ca(CN)₃

(b)

CaN₂

(c)

CaCN₂

(d)

Ca₃N₂

Explain what is meant by efflorescence.

Beryllium halides are Covalent whereas magnesium halides are ionic why ?

Why alkaline earth metals are harder than alkali metals.

Write balanced chemical equation for each of the following chemical reactions.
Lithium metal with nitrogen gas.

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

Which would you expect to have a higher melting point magnesium oxide or magnesium fluoride ? Explain your reasoning.

Give the uses of gypsum.

Discuss the similarities between beryllium and aluminium.