1.

Alkali metals posses metallic lustre when freshly cut because

Answer»

they have a hard surface and light is reflected back
their CRYSTAL structure contains ordered arrangement of constituent atoms
they contain loosely bound electrons which absor the photons and then re-emit
they are obtained from the MINERALS on which light has been falling for years

Solution :NAOH being DELIQUESCENT absord water from atmosphere therefore strength of solution will decrease.


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