Podcast
Questions and Answers
What gas is evolved when a colourless, odourless gas is produced with brisk effervescence which turns lime water milky?
What gas is evolved when a colourless, odourless gas is produced with brisk effervescence which turns lime water milky?
- H2S
- NO2
- SO2
- CO (correct)
Which gas is indicated by the evolution of a colourless gas with the smell of rotten eggs that turns lead acetate paper black?
Which gas is indicated by the evolution of a colourless gas with the smell of rotten eggs that turns lead acetate paper black?
- SO2
- CH3COOH
- CO
- H2S (correct)
What gas is identified by its pungent smell, similar to burning sulphur, which turns acidified potassium dichromate solution green?
What gas is identified by its pungent smell, similar to burning sulphur, which turns acidified potassium dichromate solution green?
- H2S
- CO
- NO2
- SO2 (correct)
When brown fumes that turn acidified potassium iodide solution containing starch solution blue are observed, what gas is being tested?
When brown fumes that turn acidified potassium iodide solution containing starch solution blue are observed, what gas is being tested?
What gas is present if colourless vapours with a vinegar-like smell are noted, which turn blue litmus red?
What gas is present if colourless vapours with a vinegar-like smell are noted, which turn blue litmus red?
Which gas is revealed when testing confirms the presence of a carbonate anion?
Which gas is revealed when testing confirms the presence of a carbonate anion?
What is the purpose of dipping the clean loop of the platinum wire in a paste of salt and concentrated hydrochloric acid?
What is the purpose of dipping the clean loop of the platinum wire in a paste of salt and concentrated hydrochloric acid?
Why is the borax bead test employed only for coloured salts?
Why is the borax bead test employed only for coloured salts?
What does a colored borax bead indicate during the borax bead test?
What does a colored borax bead indicate during the borax bead test?
Why is it crucial to confirm that the borax bead formed is transparent and colorless before performing the test?
Why is it crucial to confirm that the borax bead formed is transparent and colorless before performing the test?
What does observing the flame color through a blue glass help achieve during the flame test?
What does observing the flame color through a blue glass help achieve during the flame test?
What does a green flame with a blue center signify during the flame test?
What does a green flame with a blue center signify during the flame test?
What is the product of the reaction between 2NaNO2 and H2SO4?
What is the product of the reaction between 2NaNO2 and H2SO4?
In the Griss-Ilosvay test, what color dye is formed when sulphanilic acid is diazotised and couples with 1-naphthylamine?
In the Griss-Ilosvay test, what color dye is formed when sulphanilic acid is diazotised and couples with 1-naphthylamine?
What does a fruity odor of ethyl acetate indicate in the presence of acetate ions?
What does a fruity odor of ethyl acetate indicate in the presence of acetate ions?
What is the color change observed when acetate ions react with neutral ferric chloride solution?
What is the color change observed when acetate ions react with neutral ferric chloride solution?
What happens when I2 reacts with starch?
What happens when I2 reacts with starch?
What are the products formed when 2HNO2, 2KI, and 2CH3COOH react together?
What are the products formed when 2HNO2, 2KI, and 2CH3COOH react together?
What gas is evolved when 0.1 g of salt is mixed with manganese dioxide and conc.sulphuric acid?
What gas is evolved when 0.1 g of salt is mixed with manganese dioxide and conc.sulphuric acid?
Which anion is confirmed by the formation of a curdy white precipitate upon adding silver nitrate to the sodium carbonate extract?
Which anion is confirmed by the formation of a curdy white precipitate upon adding silver nitrate to the sodium carbonate extract?
What color does the solution turn when the gas evolved from the reaction mixture is passed through sodium hydroxide solution?
What color does the solution turn when the gas evolved from the reaction mixture is passed through sodium hydroxide solution?
Which reagent is used to acidify one part of the divided solution to confirm the presence of a specific anion?
Which reagent is used to acidify one part of the divided solution to confirm the presence of a specific anion?
What is indicated by the evolution of intense brown fumes in the last step of the experiment?
What is indicated by the evolution of intense brown fumes in the last step of the experiment?
What is the role of borax in flame tests for metal ions?
What is the role of borax in flame tests for metal ions?
What reaction occurs in the reducing flame involving cupric metaborate?
What reaction occurs in the reducing flame involving cupric metaborate?
Why is it important to observe the color of the bead both when hot and when cold?
Why is it important to observe the color of the bead both when hot and when cold?
What information can be obtained from the preliminary identification of metal ions using Table 7.9?
What information can be obtained from the preliminary identification of metal ions using Table 7.9?
What is the purpose of tapping the platinum wire with your finger to remove the bead?
What is the purpose of tapping the platinum wire with your finger to remove the bead?
Why does borax lose its water of crystallisation during heating?
Why does borax lose its water of crystallisation during heating?
