1. In Lassaigne's test, when both nitrogen and sulfur are present, the compound ______ $\frac{NaSCN}{NaCN}$ is formed, and FeCl3 gives ______ (blood-red / Prussian blue) color.

2. AgCl is ______ $\frac{white}{yellow}$ in color and is ______ $\frac{soluble}{insoluble}$ in dilute NH3.

3. AgI is ______ $\frac{white}{yellow}$ in color and is ______ $\frac{soluble}{insoluble}$ in NH3 at any concentration.

4. The KMnO4/oxalic acid titration is ______ (self-indicating / requires methyl orange) and is performed at ______ (25 °C / 60–70 °C).

5. The iodoform test is positive for ______ $\frac{all ketones}{methyl ketones only}$, giving ______ $\frac{yellow}{white}$ crystals of CHI3.

6. Tollens' reagent gives a ______ $\frac{silver mirror}{red precipitate}$ with aldehydes, but ______ $\frac{positive}{negative}$ result with ketones.

7. 2,4-DNP test gives an orange precipitate with ______ $\frac{aldehydes only}{both aldehydes and ketones}$.

8. Before testing for halogens in Lassaigne's extract when nitrogen is present, the extract must first be boiled with ______ $\frac{HNO3}{HCl}$ to destroy ______.

9. Carbylamine test: CHCl3 + KOH gives foul-smelling ______ $\frac{isocyanide}{amide}$ with ______ $\frac{primary}{secondary}$ amines.

10. The brown ring test detects ______ (NO3- / SO42-). The ring forms due to formation of ______ complex.

Answers:

1. NaSCN; blood-red
2. White; soluble
3. Yellow; insoluble
4. Self-indicating; 60–70 °C
5. Methyl ketones only; yellow
6. Silver mirror; negative
7. Both aldehydes and ketones
8. HNO3; NaCN (and Na2S)
9. Isocyanide; primary
10. NO3-; [Fe(H2O)5(NO)]2+ (brown ring complex)