Question

question 1 (1 point)
which reagents are added to the nitrate reduction test after incubation?
hydrogen peroxide and kovacs reagent
nesslers reagent and iodine
sulfanilic acid and α-naphthylamine
methyl red and barritts a
question 2 (1 point)
phenol red turns yellow under acidic conditions.
true
false

Explanation:

• For Question 1: In the Nitrate Reduction Test, after incubation, sulfanilic acid (Reagent A) and α - naphthylamine (Reagent B) are added. These reagents react with nitrite (if present) to form a red - colored compound. Hydrogen peroxide is used in catalase test, Nessler's reagent in ammonia detection, and methyl red in methyl red test.
• For Question 2: Phenol red is a pH indicator. In acidic conditions (pH < 6.8), it turns yellow. In neutral (pH = 7.4) it is red and in basic (pH > 8.4) it is pink.

Answer:

Question 1: Sulfanilic acid and α - naphthylamine
Question 2: True