Question 1: Palette 1/5

AP-EAPCET 2025 MCQ

The element whose percentage composition in an organic compound can be determined by Carius method is

A

nitrogen

B

sulphur

C

carbon

D

oxygen

Question 2: Palette 2/5

AP-EAPCET 2025 MCQ

' $x$ ' mg of an organic compound was analysed by Kjeldahl method. The ammonia evolved was absorbed in 50 mL of $0.5 \mathrm{M} \mathrm{H}_2 \mathrm{SO}_4$. The unused acid required 60 mL of 0.5 M NaOH solution for complete neutralisation. If the percentage of nitrogen in the compound is 56 , the value of $x$ is

A

500

B

250

C

750

D

375

Question 3: Palette 3/5

AP-EAPCET 2025 MCQ

Which method is used to purify liquids having very high boiling points and liquids which decompose at or below their boiling point?

A

Distillation

B

Fractional distillation

C

Distillation under reduced pressure

D

Steam distillation

Question 4: Palette 4/5

AP-EAPCET 2024 MCQ

A mixture of substances $A, B, C, D$ is subjected to column chromatography. The degree of adsorption is the order of $D>B>C>A$. The column is eluted with suitable solvent. Identify the correct statement with respect to separation of mixture

A

D comes out first from the column

B

A comes out first from the column

C

C comes out after $B$ from the column

D

$B$ comes out after $D$ from the column

Question 5: Palette 5/5

AP-EAPCET 2021 MCQ

In Lassaigne’s test for halogens, it is necessary to remove X and Y from the sodium fusion extract, if nitrogen and sulphur are present. This is done by boiling the extract with Z. Identify X, Y and Z.

A

$X=\mathrm{NaNO}_3, \quad Y=\mathrm{Na}_2 \mathrm{SO}_4, \quad Z= \mathrm{conc}. \mathrm{HNO}_3$

B

$X=\mathrm{NaNH}_2, \quad Y=\mathrm{NaSH}, \quad Z= \mathrm{conc}. \mathrm{HCl}$

C

$X=\mathrm{Na}_2 \mathrm{NO}_2, Y=\mathrm{NaSO}_3 \mathrm{H}, \quad Z= \mathrm{conc}. \mathrm{H}_2 \mathrm{SO}_4$

D

$X=\mathrm{NaCN}, \quad Y=\mathrm{Na}_2 \mathrm{~S}, \quad Z= \mathrm{conc}. \mathrm{HNO}_3$