Question

How are bases different from alkalis? Are all bases alkalis?

Answer 1

Hint: Bases do not dissolve in water for example NaOH and alkalis dissolve in water for example CuO. They have some same properties and some different properties. Alkalis are from s block in periodic table except hydrogen.

Complete step by step answer:
There are some differences between alkalis and bases. So, on the bases of these differences we can say that all bases are not alkali but all alkalis are bases. Bases accept protons.
Main difference is that bases that dissolve in water are called alkalis and bases that don't dissolve in water are only bases not alkalis, so we can say all bases are not alkali but all alkalis are bases.
Bases and alkalis are typically metal oxides, metal hydroxides, metal carbonates and carbonates of molten hydrogen.
Examples of alkalis are: NaOH, KOH, $Be(OH{)}_2$, etc. and examples of bases are : Zinc hydroxide, copper oxide, etc.
Bases(NaOH) neutralize acids and alkali(CuO) releases hydroxide ions and accepts a proton.
Alkali metals are metals from group 1 in the periodic table for example Na metal.
Base is a chemical which will react with an acid to form salt and water.
Base metals are common metals that tarnish, oxidise, or corrode relatively quickly when exposed to air or moisture.

Note: In this case the main thing to notice is that all alkalis are bases but not the vice versa. You should remember the main difference between alkali and base.