Alkali metals at a glance.

The most reactive element of alkali metals

• Li

• Na

• K

• Cs

Which gas is released when halogens react with water?

• Hydrogen

• Oxygen

• Carbon-dioxide

• Nitrogen.

Which among the following metals will give a lilac flame?

• Na

• K

• Cs

• Fr

Which among the following statement/s is true about alkali metals?

• Na is most reactive among all alkali metals.

• All group -1 metals react with air to form oxides.

• Lithium chloride formula is Li₂Cl

• Reactivity decreases down the group in alkali metals.

The compounds of group -1 metals dissolve in water to produce...........?

• Coloured solutions

• Colourless solutions.

• Cloudy solutions.

• White precipitates.

The reactivity ....................down the group in alkali metals.

When the alkali metals reacts with air, the other type of oxide can be formed with the general formula M₂O₂ , the name these oxides are .......................

Lithium burns with ...................flame

Sodium burns with...................flame

The densities of ....................., ........................ and ...................... are less than water.