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Question

When urea nitrate explosive is mixed with ethanolic solution of p-dimethyl-amino-cinnamaldehyde (p- DMAC) under neutral conditon, which colour is produced?

The correct answer is
Red

Urea Nitrate and p-DMAC: Identifying the Red Color Reaction

This question relates to a specific chemical test involving urea nitrate and the reagent p-dimethyl-amino-cinnamaldehyde (p-DMAC).

  • Reactants: Urea nitrate explosive mixed with an ethanolic solution of p-DMAC.
  • Conditions: The reaction occurs under neutral conditions (pH neutral).
  • Observation: The interaction between urea nitrate and p-DMAC under these specific conditions results in a noticeable color change.

The characteristic color produced during this reaction is Red.

p-DMAC is used here as an analytical reagent to detect the presence of urea nitrate, yielding a visual red indication.

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Important Questions from Analytical Chemistry

  1. Select the correct statement from the following options.

  2. XRD peaks are produced by ________ of a monochromatic beams of X-rays scattered at a specific angles from each set of lattice planes in a sample.

  3. Which is true for SC-2 clean procedure for initial cleaning of wafer IC fabrication?

  4. X-ray diffraction utilises electrons of energy range _______.

  5. Ninhydrin is used as detecting agent for amino acid in chromatography because ___________.

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