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a
Red lead (litharge)
b
Ammoniacal AgNO3
c
Ammoniacal AgNO3 + Red lead
d
Ammoniacal AgNO3 + HCHO
answer is D.
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Detailed Solution
In the manufacture of mirror ammonical AgNO3 and HCHO are used and following reaction is involved AgNO3 + NaOH → Ag2O + NaNO3 + H2OAg2O + NaNO3 + H2O→ [Ag(NH3)2]NO3 + NaOHHCHO + [Ag(NH3)2]NO3 → Ag(ppt) as a product silver get deposited and being shining it form a mirror.