Nitrate test to 2.5 micrograms and a concentration of 1 in 25,000 parts. Devarda's alloy (Copper/Aluminium/Zinc) is a reducing agent. When reacted with nitrate in sodium hydroxide solution, ammonia is liberated. The ammonia formed may be detected by its characteristic odor, and by damp red litmus paper's turning blue, signalling that it is an alkali — very few gases other than ammonia evolved from wet chemistry are alkaline. Aluminium is the reducing agent in this reaction that will occur. Diphenylamine may be used as a wet chemical test for the presence of the nitrate ion. In this test, a solution of diphenylamine
SAT Subject Test in Chemistry 'relationship analysis questions'. The SAT Subject Test in Chemistry is currently the only SAT that incorporates the relationship analysis questions. Relationship Analysis Questions require the student to identify the truth value of two statements. If both statements are true, the student will then have to analyze the relationship between the two statements to see if the second statement correctly explains the first statement. The last 47 questions numbered 24-70 are standard multiple choice questions. The Metric System of measurement is used, rather than United States customary units. This is widely because students across the world take SAT Subject Tests, not