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 statements is in correct ?

(a)

Li⁺ has minimum degree of hydration among alkali metal cations

(b)

The oxidation state of K in KO₂ is +1

(c)

Sodium is used to make Na / Pb alloy

(d)

MgSO₄ is readily soluble in water

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

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

Electronic configuration of 1s block of elements is ______

(a)

ns²

(b)

ns¹

(c)

ns²np¹

(d)

ns²np²

The atomic and ionic radii of alkali metals ________ on moving down the group

(a)

increases

(b)

decreases

(c)

does not vary

(d)

decreases and then increases

The hydration enthalpies of alkali metal ions decreases in ______ order.

(a)

Li⁺ > Na⁺ > K⁺ > Rb⁺ > Cs⁺

(b)

Cs⁺ > Rb⁺ > K⁺ > Na⁺ > Li⁺

(c)

Li⁺ > Rb⁺ > K⁺ > Na⁺ > Cs⁺

(d)

Rb⁺ > Cs⁺ > K⁺ > Na⁺ > Li⁺

The most electro positive element of the periodic table is _________

(a)

Gold

(b)

Platinum

(c)

Cesium

(d)

Calcium

Alkali elements exhibit an oxidation state of ________

(a)

+1

(b)

+2

(c)

+3

(d)

+4