Powder P is a mixture containing two of AgCl, AgBr or AgI. P is shaken with dilute aqueous ammonia. A yellow solid, Q, remains. The mixture is filtered and Q is washed and dried. The filtrate is collected and treated with aqueous nitric acid to produce a white precipitate, R, which is filtered off, washed and dried. Q and R are warmed separately with concentrated sulfuric acid, H2SO4. Which observations are made? [Table with columns "Q + concentrated H2SO4", "R + concentrated H2SO4"]

Chlorine gas is widely used to treat contaminated water. Which species present in water when chlorine gas has been ad…

Some uses of chlorine and bromine are given. Which is a use of bromine?

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But-2-ene-1,4-diol is converted in two steps through an intermediate X into oxobutanedioic acid. HOCH₂CH=CHCH₂OH but-…