MCQ Quiz on Salt Mixture Analysis

What is the first step in the qualitative analysis of cations?

• Heating the mixture

• Performing the flame test

• Adding dilute HCl to the salt solution

• Adding concentrated H2SO4 to the salt solution

Which of the following cations belong to Group 1 in qualitative analysis?

• Pb²⁺, Hg₂²⁺, Ag⁺

• Cu²⁺, Cd²⁺, Bi³⁺

• Fe³⁺, Al³⁺, Cr³⁺

• Zn²⁺, Mn²⁺, Ni²⁺

Which reagent is used to test for the presence of Group 2 cations?

• NH4Cl and NH4OH

• HCl

• H2S in acidic medium

• NaOH in basic medium

What color precipitate does Pb²⁺ form with HCl?

• Yellow

• White

• Black

• Green

Which gas is evolved when carbonates react with dilute acids?

• H2

• CO2

• SO2

• NH3

What is the confirmatory test for chloride ions (Cl⁻)?

• Addition of AgNO3 to form a white precipitate

• Reaction with H2SO4 to evolve HCl gas

• Addition of BaCl2 to form a white precipitate

• Adding potassium chromate to form a yellow precipitate

Which of the following is NOT a Group 3 cation?

• Fe³⁺

• Al³⁺

• Cr³⁺

• Ba²⁺

What is the color of the precipitate formed by Fe³⁺ in Group 3 analysis?

• Blue

• Green

• Reddish-brown

• White

What is the role of NH4Cl in Group 3 cation analysis?

• To buffer the solution and maintain a slightly acidic pH

• To oxidize the cations

• To form soluble complexes with anions

• To precipitate the cations

Which of the following reagents is used to detect sulfate ions (SO4²⁻)?

• AgNO3

• BaCl2 in acidic medium

• NaOH

• NH4OH