Alkali metal with the lowest melting point is -

1. Na

2. K

3. Rb

4. Cs

The incorrect statement about alkali metals is -

1. They have low density.

2. They have high ionization enthalpy.

3. They are highly reactive.

4. They show photoelectric effect.

The oxidation state of sodium in Na₂O₂ is -

1. +1

2. -1

3. 0

4. +2

Beryllium and Magnesium do not impart color in flame test, because -

1. Be and Mg have high Ionization Energy.

2. Be and Mg have low Ionization Energy.

3. Be and Mg radiate energy in the Infra-Red region.

4. Be and Mg have a high radius.

Lithium salts are generally hydrated because they have :

1. High polarizing power.

2. High ionization enthalpy.

3. High electronegativity.

4. Low polarizing power.

The incorrect statement among the following regarding alkaline earth metals is : 

The incorrect statement among the following is-