Old tell Q3

Old tell Q3 (9) •amq snull!l sum pot•.10A0 s! luaaund •pamq umx!tu pue poppe s! appK0JpK1.l I-ut1!POS OJ • •ssaoxa u! uopntos aruq 01 soaueqo pouuoj amq Oled •ssaoxo u! poppe v. uonmos0J

Dear student 
Z - Ammonium chloride ( NH ₄ Cl).
When ammonium chloride ( NH_{​​​​​4}Cl) react with sodium hydroxide ( NaOH) then a pungent smell gas is evolved. 

Reaction - 
NH₄Cl +NaOH → NH_{​​​​​4}​​​​OH + NaCl.
It turn red litmus paper to blue because NH4OH(ammonium hydroxide) is formed which is a base and it contains NH4+ ion and OH- ion. Since basic ion is present, hence it changes the red litmus paper blue.
Hope it help
Regards