JEE Main 2024 (Online) 4th April Morning Shift | Salt Analysis Question 16 | Chemistry

JEE Main 2024 (Online) 4th April Morning Shift

MCQ (Single Correct Answer)

-1

In the precipitation of the iron group (III) in qualitative analysis, ammonium chloride is added before adding ammonium hydroxide to :

decrease concentration of $${ }^{-} \mathrm{OH}$$ ions

increase concentration of $$\mathrm{Cl}^{-}$$ ions

prevent interference by phosphate ions

increase concentration of $$\mathrm{NH}_4{ }^{+}$$ ions

JEE Main 2024 (Online) 29th January Morning Shift

MCQ (Single Correct Answer)

-1

Appearance of blood red colour, on treatment of the sodium fusion extract of an organic compound with $$\mathrm{FeSO}_4$$ in presence of concentrated $$\mathrm{H}_2 \mathrm{SO}_4$$ indicates the presence of element/s

N and S

JEE Main 2023 (Online) 13th April Evening Shift

MCQ (Single Correct Answer)

-1

In the wet tests for detection of various cations by precipitation, $$\mathrm{Ba}^{2+}$$ cations are detected by obtaining precipitate of

$$\mathrm{BaSO}_{4}$$

$$\mathrm{Ba}(\mathrm{OAc})_{2}$$

$$\mathrm{BaCO}_{3}$$

$$\mathrm{Ba}(\mathrm{ox})$$ : Barium oxalate

JEE Main 2023 (Online) 11th April Morning Shift

MCQ (Single Correct Answer)

-1

When a solution of mixture having two inorganic salts was treated with freshly prepared ferrous sulphate in acidic medium, a dark brown ring was formed whereas on treatment with neutral $$\mathrm{FeCl}_{3}$$, it gave deep red colour which disppeared on boiling and a brown red ppt was formed. The mixture contains :

SO$$_3^{2-}$$ & C$$_2$$O$$_4^{2-}$$

$$\mathrm{CH}_{3} \mathrm{COO}^{-} \& ~\mathrm{NO}_{3}^{-}$$

$$\mathrm{C}_{2} \mathrm{O}_{4}{ }^{2-} \& ~\mathrm{NO}_{3}^{-}$$

$$\mathrm{SO}_{3}^{2-} \& ~\mathrm{CH}_{3} \mathrm{COO}^{-}$$

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